JPH02181767A - Method and device for winding scanner wire in scanner - Google Patents

Abstract

PURPOSE:To set the position of an optical system at the original position where a pulse is generated with high accuracy by obstructing the rotation of a scanner pulley, deciding the position of the scanning optical system when the pulse of every rotation of a rotary encoder is generated and winding a scanner wire around the scanner pulley. CONSTITUTION:When the pulse of every rotation of the rotary encoder 44 which is directly connected to a scanner motor 30 is outputted, the rotation of the scanner pulley 31 is obstructed and simultaneously the scanning optical system is positioned at a stopping position. Under such a state, the pulley 31 is fixed by using a jig hole 49, a groove 50 and a jig pin 51 and the scanner wire 32 is wound. Next, the end of the wire 32 is connected and fixed to the optical system after the wire 32 is wound around the respective pulleys. Then, the state that the rotation of the pulley is obstructed is cancelled by pulling out the pin 51. Thus, the position of the optical system and the original position where the pulse is generated are set with high accuracy without receiving the effect of an idle pulley or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a scanner wire routing method and apparatus for a scanner such as a full-color copying machine or a full-color image scanner.

Conventional Technology Generally, in this type of scanner, a part of the scanner wire driven by a scanner motor is connected to a scanning optical system equipped with a lamp, a mirror, etc., and this scanning optical system is moved back and forth through the scanner wire. The document image is then scanned.

Here, the scanning optical system reciprocates between a predetermined home position and a maximum scan position. Generally, the home position HP detected by a combination of a wire provided in a part of the scanning optical system and an HP photosensor for detecting the home position attached to a predetermined position of the main body is set as the origin position of scanning. .

However, 1. For example, in a full-color copying machine, the same color document is scanned multiple times, and a latent image of the color document is formed for each scan and developed with toner of a corresponding color.The image creation process is repeated. That's what I do. At this time, in order to obtain a good superimposed color image, it is necessary that the scanning positions for each color match accurately, and it is necessary to accurately determine the origin position, which is the reference of the scanning optical system. HP detection alone is too rough).

For this reason, in the past, a rotary encoder was directly connected to the axis of the scanner motor, and the origin position of the scanning optical system was set to the generation position of the Z-phase pulse, which was output one pulse per rotation of the rotary encoder. There is.

In this way, when the origin position of the scanning optical system is set as the Z-phase pulse generation position of the rotary encoder, it is necessary to accurately set the positional relationship between the scanning optical system position and the Z-phase pulse output position. Generally, in order to determine the positional relationship between the scanner pulley on the scanner motor shaft around which the scanner wire is wound and the scanning optical system, a steel ball 2 is attached to a part of the wire 1 as shown in FIG. caulking,
This steel ball 2 is fitted into the hole 4 of the pulley 3 (more specifically, the wire 1 is wound around the pulley 3 by 1/4 turn on each side around the steel ball 2), and the wire fixing jig 5 A common method is to fix it.

Problem to be Solved by the Invention However, when the steel ball 2 is caulked to the wire l in order to determine the scanner position and the origin pulse generation position, the distance from the end of the wire to the caulking position of the steel ball 2 is as long as about 3 m. and,
In an actual driving system of a scanning optical system, there are a plurality of idler pulleys and the like up to the scanner pulley, and each of them is attached to a respective bracket, so the stacking tolerance due to these is large. Therefore, positioning accuracy deteriorates, and the accuracy of each individual item must be improved.

Means for Solving the Problem A scanner pulley is provided on the scanner motor shaft, and a part of the scanner wire that is wound around the scanner pulley is connected to a scanning optical system through a plurality of pulleys, and the scanner is driven by the scanner motor. In a scanner in which the scanning optical system is moved via a wire to scan a document image on a document table, a rotary encoder that outputs one pulse per rotation is directly connected to the scanner motor shaft, and the rotary encoder is directly connected to the scanner motor shaft. When a pulse for each rotation is output from a portion of the scanning optical system, and then
The rotation prevention of the scanner pulley is released.

Further, a scanner pulley is provided on the scanner motor shaft, and a part of the scanner wire that is wound around the scanner pulley is connected to the scanning optical system through a plurality of pulleys, and the scanner wire is connected to the scanner wire by driving the scanner motor. In a scanner that scans a document image on a document table by scanning a scanning optical system,
A rotary encoder is provided that is directly connected to the scanner motor shaft and outputs one pulse per rotation, and a through hole is formed through a part of the scanner pulley in the axial direction, and a rotary encoder is formed on the scanner motor side. Pulley rotation that prevents rotation of the scanner pulley at a position where a pulse per rotation is output from the rotary encoder, which is composed of a groove facing the through hole and a through pin that can be inserted into and removed from the through hole and the groove. A blocking mechanism was installed.

Operation When this pulse is output from the rotary encoder that is directly connected to the scanner motor and outputs one pulse per rotation, the scanner pulley is prevented from rotating, and the scanner pulley is moved with the scanning optical system positioned at the stop position. Since the scanner wire is routed around the scanner pulley and the origin, the positional relationship between the position of the scanning optical system and its origin, that is, the position where pulses are output for each rotation from the rotary encoder, can be adjusted between the scanner pulley and the origin without being affected by idler pulleys, etc. Highly accurate settings can be made based only on the relationship with the pulse generation position. After fixing the scanner wire around the scanner pulley, the original scanning drive becomes possible by releasing the rotation prevention of the scanner pulley, but the position of the scanning optical system and its origin position cannot be maintained accurately. Ru.

When running such a scanner wire, if the through-hole of the rotation prevention mechanism is inserted through the through-hole into the groove,
Under the desired positional relationship, rotation of the scanner pulley can be easily and reliably prevented, and after fixation, the rotation prevention can be released by simply pulling out the penetrating bottle, allowing the original operation.

Embodiment An embodiment of the present invention will be explained based on FIGS. 1 to 6.

First, the schematic structure and operation of a full-color copying machine to which this embodiment is applied will be explained with reference to FIG.

A scanning optical system 12 for exposing and scanning an original (not shown) placed on an original placing table (contact glass) 11 is provided inside the copying machine main body IO. The scanning optical system 12 includes a first scanner 15 including a light source 13 that exposes the document, a first mirror 14 that receives reflected light from the document, and a scanner 15 that includes second and third mirrors 16 and 17 that receive light after the first mirror 14. 2 scanner 18, an imaging lens 19 whose position is displaced according to the magnification, and a fourth mirror 20 whose position is fixed.
1. 22 is a color separation filter.

As is well known, a charger 23, a developing section 24, a transfer charger 25, etc. are provided around the photoreceptor 21 in accordance with the electrophotographic process. It consists of a color developing section for each color (cyan, black). Further, a transfer drum 27 is provided at a position of the transfer charger 25 adjacent to the photoreceptor 21, which winds and holds the transfer paper 26 in order to repeat the transfer process multiple times on the same transfer paper 26. That is, the transfer paper 26 is imaged on the photoconductor 21, and after receiving the first developed toner image transferred, it rotates together with the transfer drum 27, and the image is formed on the photoconductor 21 by the next scanning. Next, the operation of transferring the developed color toner image is repeated multiple times for the same color document.

Next, the scanning optical system 12 (first and second scanners 15
．． 18) The drive system will be explained with reference to FIG. This drive system moves the first scanner 15 and the second scanner 18 in the same direction at a speed ratio of 2:l, and is a one-sided wire drive system. First, the first and second scanners 15-
．． Guide shafts 28, 29 are provided on both sides to guide the movement of 18 (bearings include rolling bearings, etc.).

Further, a scanner motor 30 that can be rotated in forward and reverse directions is provided as a drive source. A scanner pulley 31 is provided on the axis of this scanner motor 30. After the scanner wire 32 is wound a plurality of times around the scanner pulley 31, one end of the scanner wire 32 passes through a plurality of fixed pulleys 33 and 34 appropriately arranged near the guide shaft 28, and then passes through the first end.
It is clamped to a part of the scanner 15. Also,
The other end of the scanner wire 32 coming out of the scanner pulley 31 is guided by a fixed pulley 33, then wound half a turn around a fixed pulley 35 provided on the home position side, and then wound half a turn around a movable pulley 36 integrated with the second scanner 18. The movable pulley 3 is wound around another fixed pulley 37, and then passed through the idler pulleys 38, 39 and the fixed pulley 40.
6 from the opposite direction, and is clamped to a part of the first scanner 15. Further, a fish 41 is provided in a part of the first scanner 15, and an HP sensor 42 for detecting the arrival of the fish 41 is provided at a predetermined position on the home position side of the main body of the apparatus.

Further, an overrun detection sensor 43 is provided at a predetermined position on the return side.

Further, a control rotary encoder 44 is directly connected to the shaft of the scanner motor 30.

The rotary encoder 44 outputs pulses from the A, B, and Z phases in accordance with the rotation of the scanner motor 30. For example, when the scanning optical system 12 moves for scanning, the rotary encoders 44 A and B
The phase outputs 2000 pulses per rotation, and the Z phase outputs 1 pulse per rotation. In addition, the first
When the scanner 15 returns to the home position P side from the position shown in FIG.
is detected. The scanning optical system 12 is the HP sensor 42
Even after the detection, the first and second scanners 15 and 18 continue to move in the return direction within a collision-free range, and after the Z-phase pulse of the rotary encoder 44 is output, they stop at a predetermined stop position.

FIG. 5 shows the output of the HP sensor 42 and the Z of the rotary encoder 44 as the scanning optical system 12 moves.
3 is a timing chart showing the relationship with phase pulse output, etc. Here, if the diameter of the wire winding part of the scanner pulley 31 is 30 mm, the first scanner 15 will move about 9411 Im in one rotation of the scanner motor 30, so for example, in scanning an A3 size paper with a maximum length of 420 mm, The Z-phase pulse will be generated 4 to 5 times as shown in FIG.

The Z-phase pulse in FIG. 5 corresponds to the last pulse.

Therefore, in this embodiment, as shown in FIG.
The position where a pulse is output from the Z sum of the rotary encoder 44 under the return state near the home position detected by the sensor 42 is set as the origin position of the scanning optical system 12 (first scanner 15). .

In this embodiment, in order to satisfy such a positional relationship,
The scanner wire 32 is positioned around the scanner pulley 31 so that a pulse is generated from the Z phase of the rotary encoder 44 at the origin position. The structure and wire routing method for this purpose are shown in Figures 1 and 2.
This will be explained using figures. First, the motor shaft 45 of the scanner motor 30 is an irregular shaft with a curved cross-section, and the shaft hole 46 of the scanner pulley 31 that fits therein also has a curved cross-section.
The set screw 47 prevents removal and fixes.

Further, a flange 48 fixed to the scanner motor 30 side is interposed between the scanner motor 30 and the scanner pulley 31. A jig hole 49 serving as a through hole is formed in the inner region of the wire winding portion of the scanner pulley 31 in the axial direction, and a groove 50 is formed in the flange 48 at a corresponding radial position. It is formed. Furthermore, a jig bin 51 is provided as a penetrating bin that is inserted into and removed from these jig holes 49 and grooves 50 to prevent rotation of the scanner pulley 31. These jig holes 49, grooves 50, and jig bins 51 constitute a rotation prevention mechanism 52. Therefore, when the jig bin 51 is not inserted through the jig hole 49 and the groove 50, the rotation prevention is released and the scanner pulley 31 can rotate together with the scanner motor 30 as usual.

In this embodiment, the scanner stop position is used as a reference for hooking the scanner wire, and the jig hole 49 is positioned on a line connecting the motor shaft 45 and the scanner stop position, as shown in FIG. It is formed by Then, with this scanner stop position as a reference, the origin signal generation position (the Z-phase pulse generation position of the rotary encoder 44), the HP sensor detection position, and the document leading edge position are set in the positional relationship (angular relationship) shown in FIG. ing.

In such a configuration, first, the first and second scanners 15
．． 18 to each return stop position (scanner stop position)
Position and fix. Then, the jig bin 5 is inserted from the jig hole 49 of the scanner pulley 31 into the groove 50 of the flange 48.
1 through the scanner pulley 31. Therefore, rotation of the scanner motor 3o is prevented. In this rotation-blocking state,
The jig hole 49 and the like are set in a positional relationship as shown in FIG. 2 with respect to the origin signal generation position. Therefore, by threading the scanner wire 32 around the scanner pulley 31 several times with reference to the scanner stop position in such a rotation-blocking state, the eleventh and second scanners 15.
The correspondence relationship between the position 18 and the origin signal generation position is determined with high precision. In other words, the accuracy can be regulated only by the relationship between the scanner pulley 31 and the origin pulse generation position. In this state, each pulley 3 including the scanner pulley 31
A scanner wire 32 is passed around wires 3 to 40, etc., and both ends are clamped and fixed to the first scanner 15. after,
By removing the jig bin 51 from the jig hole 49, the state in which the rotation of the scanner pulley 31 or the scanner motor 30 is blocked is released, and the original scanning drive becomes possible.

Effects of the Invention As described above, the present invention prevents the rotation of the scanner pulley when a pulse per rotation of the rotary encoder directly connected to the scanner motor is output, and also prevents the rotation of the scanner pulley while positioning the scanning optical system at the stop position. Since the scanner wire is wrapped around the scanner pulley and connected and fixed to the scanning optical system, the positional relationship between the position of the scanning optical system and its origin position, that is, the position where pulses are output from the rotary encoder every rotation, can be determined as follows. It can be set with high accuracy based only on the accuracy of the relationship between the scanner pulley and the origin pulse generation position without being affected by idler pulleys, etc., and can be maintained during actual driving. When rotating the scanner pulley, by inserting the through-hole of the rotation prevention mechanism into the groove from the through hole, the rotation of the scanner pulley can be easily and reliably prevented under the desired positional relationship. Simply by removing the penetrating bottle, the rotation prevention can be released and the original operation can be made possible.

[Brief explanation of the drawing]

1 to 6 show an embodiment of the present invention,
Fig. 1 is an exploded perspective view of the vicinity of the scanner motor, Fig. 2 is a plan view, Fig. 3 is a schematic front view of the full-color copying machine, Fig. 4 is a schematic perspective view of the drive system of the scanner optical system, and Fig. 5 is a timing chart, FIG. 6 is a timing chart, and FIG. 7 is an exploded perspective view showing a conventional example. DESCRIPTION OF SYMBOLS 11... Original stage, 12... Scanning optical system, 3o... Scanner motor, 31... Scanner pulley, 32... Scanner wire, 44... Rotary encoder, 49... Through hole , 50...groove, 51...
- Penetration bottle, 52...Rotation prevention mechanism 6 and 7

Claims (1)

[Claims] 1. A scanner pulley is provided on the scanner motor shaft, and a part of the scanner wire that is wound around the scanner pulley is connected to a scanning optical system via a plurality of pulleys, and the scanner motor is driven to In a scanner that scans a document image on a document table by scanning the scanning optical system via a scanner wire, a rotary encoder that outputs one pulse per rotation is directly connected to the scanner motor shaft, and the rotary encoder is directly connected to the scanner motor shaft. When a pulse per rotation is output from the encoder, the rotation of the scanner pulley is blocked and the scanning optical system is positioned at the stop position, and in this state, the scanner wire is wound around the scanner pulley, and then the scanner A method for threading a scanner wire in a scanner, characterized in that a part of the wire is connected to the scanning optical system, and then rotation prevention of the scanner pulley is released. 2. A scanner pulley is provided on the scanner motor shaft, and a part of the scanner wire that is wrapped around the scanner pulley is connected to the scanning optical system via a plurality of pulleys, and the scanner motor is driven to connect the scanner wire to the scanning optical system. In a scanner that scans a document image on a document table by scanning a scanning optical system, a rotary encoder that is directly connected to the scanner motor shaft and outputs one pulse per rotation is provided, and a rotary encoder is provided as a part of the scanner pulley. The rotary encoder comprises a through hole formed in the axial direction, a groove formed on the scanner motor side and facing the through hole, and a through pin that can be inserted into and removed from the through hole and the groove. A scanner wire routing device for a scanner, characterized in that a pulley rotation blocking mechanism is provided for blocking rotation of the scanner pulley at a position where a pulse is output for each rotation.