JPH0419550Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field> The present invention utilizes the movement of a means for optically scanning a placed document, particularly in a copying machine, to transfer an image formed on a recording medium to a transfer material. The present invention relates to an adjustment device for controlling the conveyance timing of a transfer material when transferring to a computer.

<Prior Art> A copying machine employing an electrophotographic method transfers an image formed on a recording medium onto a transfer material that is sent as appropriate. In this case, it was necessary to control the conveyance timing of the transfer material so that the leading edge of the image formation on the recording medium and the leading edge of the transfer material coincided at the transfer position.
For this reason, as an example, there is a conventional method in which conveyance of the transfer material to the transfer position is started based on a signal from a detection means that detects the moving position of the recording medium, particularly the position of the rotating recording medium. As a means for detecting the rotational position of the recording medium, a cam plate or a synchronizing disk that rotates in synchronization with the recording medium is provided, and a micro switch placed at an appropriate position is actuated by the cam plate to determine the rotational position. Alternatively, there are devices that detect each slit provided in a synchronizing disk to confirm the rotational position.

When the rotational position of the recording medium is detected by the cam plate and the microswitch to start conveyance of the transfer material, errors occur in each copying machine, and the leading edge of the transfer material and the leading edge of the formed image are misaligned. This also applies to the detection of slits in the synchronous disk. In order to eliminate this deviation, the arrangement positions of microswitches and the like and the slit forming position of the synchronization disk are adjusted. However, there are restrictions on the placement of microswitches, etc., and adjusting their positions is not only very troublesome, but also because the slits in the synchronous disk are formed all at once by press processing, so it is difficult to adjust their positions using a delay timer or the like. Consideration has been given to correcting the slit formation position. In addition, the cam plate or synchronization disk is provided not only to control the conveyance timing of the transfer material, but also to obtain synchronization signals to know the operating status of the copying machine and signals to control other copying processes. It is used for. Therefore, after adjusting the transfer material conveyance timing, the timing of other controls often shifts.

Therefore, in order to form an original image on a recording medium without controlling the conveyance of the transfer material in synchronization with the rotation of the recording medium, the movement of the scanning means that optically scans the original is used to A method for starting transportation has been proposed and implemented. FIG. 8 is a schematic diagram showing a specific example of this, in which the scanning means moves a document table. In the figure, a document table 1 is provided on the main body of the copying machine so as to be movable back and forth, and a document to be copied is placed on top of the document table 1.
This document table 1 is in the position shown in when the copying machine is on standby. When the copy switch for starting copying is operated in this state, it is moved in the A direction and the micro switch MSW5 indicating the exposure start position (original scanning start position) is moved to the rear part of the detection plate 2.
b, and the document table 1 stops at that position.
The stopping position is as shown in . A detection plate 2 for operating the microswitch MSW5 is provided on one side of the moving document table 1, and is placed at a position on the movement path of the detection plate 2 that indicates the start of exposure.

Then, when an exposure start command is given, the document table 1 is moved in the direction B, the document is scanned, and exposure onto the recording medium is started. While the document table 1 is moving, a microswitch MS6 is operated to start conveying the transfer material in synchronization with the rotation of the recording medium. The microswitch MS6 is operated at the front end 2a of the detection plate 2. Further, the micro switch MS6 is arranged at a position for starting the conveyance of the transfer material on the moving path of the detection plate 2.
After the micro switch MS6 is activated, the document table 1 is further moved in the B direction, and the micro switch MS6 is activated by the second detection plate 3 that detects the overrun state.
is restarted, and the movement of the document table 1 is thereby stopped, and this state is as shown in FIG. While the document table 1 is moving, the conveyed transfer material is sent to a transfer position where it comes into contact with a recording medium, and the formed image is transferred.

After the document table 1 is stopped, the document table 1 is moved to the initial position and stopped at that position. In this case, while the document table 1 is moving in the B direction, the microswitch MSW6 is activated to start conveying the transfer material, but the timing of this conveyance is determined for each copy by taking into consideration the placement position of the microswitch MSW6. Adjusted to suit the material. However, since it is troublesome to adjust the arrangement position of the micro switch MSW6, the position of the detection plate 2 for activating the switch is adjusted, and the timing of transporting the transfer material is adjusted. A specific example of this is shown in FIGS. 9 and 10. As shown in the figure, the detection plate 2 has an elongated hole 4 for position adjustment, and is movably provided on a glass support plate 5 of the document table 1. Further, the detection plate 2 is fixed to the glass support plate 5 with screws 6 through the elongated holes 4.

Therefore, to adjust the detection plate 2, loosen the screw 6, move the detection plate 2 to the left or right position, and then tighten the screw 6.
I am trying to tighten it again. Although this method does make the adjustment easier than adjusting the arrangement and position of microswitches, it still takes time and effort and does not significantly improve work efficiency. Moreover, it is troublesome to move the detection plate 2, and it is difficult to make slight movement adjustments, making it impossible to achieve accurate adjustment.

<Purpose> The present invention utilizes the movement of an optical scanning means to enable easier and more accurate adjustment of the conveyance timing in a device for synchronizing the conveyance timing of a transfer material with the rotation of a recording medium. The purpose is to

<Example> FIG. 1 is a plan view showing a transfer material conveyance timing adjustment mechanism according to the present invention, FIG. 2 is a side sectional view of the main part thereof, and FIG. 3 is a back view. A mechanism for adjusting the transfer timing of the transfer material is provided on a fixed plate 11 that fixes a wire 10 for reciprocating the document table. The fixing plate 11 of the wire 10 has a cross section L provided on one side of the document table 12 as shown in FIG.
It is fixed to the letter-shaped glass support 13 with screws or the like. The fixing position of the fixing plate 11 to the glass support 13 is at the tip in the moving direction.

As described above, the document table 12 has a glass support 13 fixed to one side of a transparent glass plate 14 on which a document is placed using screws 15. A rail 16 is attached to the glass plate 14 using screws 15 on the glass support 13 so that the document table 1 can be moved back and forth.
It is fixed between the two. The rail 16 is slidably supported by a guide rail 17 arranged in the reciprocating direction of the document table 12 on the main body of the copying machine. Therefore, a driving pulley (not shown) around which the wire 10 whose end is fixed to the wire fixing plate 11 is wound,
By rotating in the forward or reverse direction, the document table 12 is reciprocated along the guide rail 17. A micro switch is activated to start conveying the transfer material as explained in FIG.
MSW6 is placed on the side of the copier body.

In order to operate the micro switch MSW6, the wire fixing plate 11 is provided with an adjustment plate 19 having a detection plate 18 integrally formed therein. Adjustment plate 1
9 is movably provided in a guide hole 20 bored in the fixed plate 11, as shown in FIG. The detection plate 18, which is integrally formed with the adjustment plate 19, protrudes from the back surface of the fixed plate 11 through the guide hole 20, as shown in FIGS. 2 and 3.
Micro switch located on the side of the copying machine body
Opposite to activate MSW6. A member 21 that corresponds to the detection plate 18 and constitutes the rear end 2b of the detection plate 2 shown in FIG. 8 is fixed to the back surface of the fixed plate 11. The member 21 has a stepped portion 21 _-1 for connecting with the detection plate 18 so as not to hinder the movement of the detection plate 18.
A bifurcated portion 18 _-1 is formed on the detection plate 18 so as to sandwich this stepped portion 21 _-1 . In addition, the rightward movement of the adjustment plate 19 is restricted by
This is done using the adjustment board itself.

On the other hand, a rack portion 22 for freely moving the adjustment plate 19 is integrally formed on the side surface of the adjustment plate 19. An adjustment gear 23 that meshes with this rack portion 22 is provided. The adjustment gear 23 has a head 24 on the upper part of the shaft for rotating the gear 23.
The lower part of the shaft portion is inserted into a circular hole formed in the fixed plate 11 so as to be rotatable. This adjustment gear 23 is held by a gear holding member 26 fixed to the fixed plate 11 with screws 25 so that both sides of the gear 23 are sandwiched, and positioned at that position. Further, in the figure, one end of the wire 10 is fixed to a folded piece 27 formed on the fixed plate 11. Furthermore, the head 24 of the adjusting gear 23 is located at an opening 24 formed in the glass support 13.
are provided in correspondence with the above, making adjustment work easier.

In the structure as described above, the wire 1
By rotating the pulley wrapped around 0, the 8th
The document table 12, which is in the state shown in the figure, moves in the direction of the exposure start position. And member 2
1 operates the micro switch MSW5, and the document table 12 is stopped. In this state, when a command to start scanning is output, the document table 12 is moved (forward movement) in the document scanning direction, and the document image is transferred to the optical means (not shown) on the recording medium that rotates together with the document table 12. imaged through.

In order to start conveying the transfer material at a fixed position while the document table 12 is moving (forward movement), the micro switch MSW6 is set so that the image forming edge on the recording medium and the transfer material tip coincide with the transfer position. is the detection plate 18
It is operated at. If the conveyance timing of the transfer material at this time is slow, that is, the leading edge of the transfer material lags behind the image forming leading edge on the recording medium, the timing of conveying the transfer material may be advanced. For this purpose, the adjusting gear 23 may be rotated clockwise in FIG. 1. As a result, the adjustment plate 19 is moved to the left in the drawing, and the detection plate 18 approaches the micro switch MSW6 as shown in FIG. Therefore, the micro switch that starts conveying the transfer material is
The operation of MS6 becomes faster, and the timing of transporting the transfer material can be accelerated.

On the other hand, if the leading edge of the transfer material reaches the transfer position earlier than the image forming leading edge of the recording medium, the timing of conveyance of the transfer material may be delayed. For this,
The adjustment gear 23 may be rotated counterclockwise to adjust the detection plate 18 so that it is farther away from the micro switch MSW6. As a result, the start of transport of the transfer material is delayed, and adjustment can be made so that the leading edge of the transfer material and the leading edge of the image formation on the recording medium coincide with each other at the transfer position.

As described above, the timing for starting conveyance of the transfer material can be adjusted simply by rotating the adjusting gear 23 in any direction with a screwdriver or the like, and the adjustment is very simple. Further, even when the detection plate 18 is slightly moved, it is only necessary to rotate the gear 23 accordingly, and accurate adjustment can be easily performed.

Here, after adjustment, it is necessary to fix the adjustment plate 19 in that position so that it does not move. In other words, if the adjustment plate 19 moves due to vibration or the like, the timing of conveyance of the transfer material is naturally shifted, and the leading edge of the transfer material and the leading edge of the image formation on the recording medium are shifted. For this purpose, it is preferable to fix the adjusting plate 19 or the adjusting gear 23 by some means after adjustment. For example, a document cover that can be opened and closed to cover the glass plate 14 and bring the placed document into close contact with the glass surface is installed on the glass support 13 after adjustment. 19 may be fixed. In this case, it is not inconceivable that the detection plate 18 would move when the document cover is attached.

Therefore, it is preferable to adopt a configuration that restricts the rotation of the adjustment gear 23 as shown in FIG. As shown in the figure,
The gear holding member 26 fixed to the wire fixing plate 11 with screws 25 is made of an elastic material such as resin, and is located between the space formed by the lower holding part 26 _-1 and the upper holding part 26 _-2 . Both sides of the adjustment gear 23 are held. In particular, the lower holding part 26 _-1 of the gear holding member 26
is bent so as to push up the adjusting gear 23 upward, and the head 24 of the adjusting gear 23 is pressed against this pushing up and elastically deformed, thereby pushing the adjusting gear 23 upward. It is possible to press down. In the above configuration, a stopper 29 made of, for example, CR rubber, which is a high friction member constituting a fixing member, is interposed between the upper surface of the adjustment gear 23 and the lower surface of the upper holding portion 26 _-1 of the gear holding member 26. has been done.

Therefore, the adjustment gear 23 is attached to the gear holding member 26
Since it is pushed up by the lower holding part _26-1 , it is pressed against the upper holding part _26-2 via the stopper 29.
As a result, the rotation of the adjustment gear 23 is regulated, that is, fixed, and this state is maintained.
Therefore, the adjustment plate 19 and the detection plate 18 are restricted in their movement and do not move due to vibrations or the like.

Further, the position of the detection plate 18 is adjusted by rotating the adjustment gear 23. The adjustment gear 23 is rotated by pushing down the head 24 to deform it downward using the elasticity of the lower holding part 26 _-1 of the holding member 26 and releasing the pressure contact with the holding member 26 . Rotate. In this case, the adjustment gear 23
Although it is possible to rotate the stopper 29 without pressing it down, an acting force is required to overcome the restraining force of the stopper 29.

The fixing of the adjustment plate 19 shown in FIG.
It is something that fixes itself. As shown in the figure,
The upper part 26 _-2 of the gear holding member 26 is formed so as to cover the upper surface of the adjustment plate 19 as well. A fixing means is provided between the contact portion between the upper part 26 _-2 of the gear holding member 26 and the upper surface of the adjustment plate 19. That is, a very small triangular cutout 30 is formed on the lower surface of the upper part 26 _-2 of the gear holding member 26, and the above-mentioned cutout 30 is also formed on the upper surface of the adjustment plate 19.
A very small triangular cutout part 3 to fit the
1 is formed. Therefore, the engagement of both the threaded portions 30 and 31 ensures that the adjustment plate 19 is fixed at that position. The gear holding member 2
The upper part 26 _-2 of 6 is made to apply an elastic force so as to press against the upper surface of the adjustment plate 19.
The adjusting plate 19 can be fixed more reliably. For this purpose, the gear holding member 26 is preferably made of an elastic member such as resin.

Furthermore, if the distance between the adjusting plate 19 and the gear holding member 26 is maintained as shown in FIG. 7, the effect of fixing the adjusting plate 19 will be increased. This is so that the distance β between the adjusting plate 19 is equal to or slightly larger than the distance α between the upper part 26 _-2 of the gear holding member 26 (α≦β). As a result, the pressing force of the upper part 26 _-2 of the gear holding member 26 against the adjustment plate 19 is increased, the engagement force between the two threaded portions 30 and 31 is increased, and reliable fixation can be expected.

In the configuration as shown in FIG. 6, the adjustment gear 23 is operated by an acting force that overcomes the engagement force of the two threaded portions 30 and 31 due to the pressure contact force of the upper part _26-2 of the gear holding member 26. By rotating it, the position of the detection plate 18 can be easily adjusted. After adjustment, the engagement force of the double-sided cutout portions 30 and 31 ensures that the detection plate 18 is in the determined position without being displaced due to vibrations or the like during movement by the document table 12. can be fixed. In the model shown in Fig. 6, the gear holding member also serves as the member that presses the adjustment plate 19, so the stopper 29 is not required compared to the model shown in Fig. 5, which simplifies the assembly process. Not only that, but it can also be done at a lower cost.

By configuring as shown in FIGS. 5 and 6 as described above, considerations such as fixing the adjustment plate 19 after adjustment are not necessary. Therefore, it is recommended to move the document table 12 to check whether the detection plate 18 is correctly positioned after adjustment, so that the detection plate 18 will not be misaligned during this confirmation, and readjustment can be performed after confirmation. This allows for more precise adjustments to be made very easily.

In addition, in FIG. 6, a part of the gear holding member 26 is also used to fix the adjustment plate 19.
However, the present invention is not limited to this, and a member that presses against the upper surface of the adjustment plate 19 may be provided separately, and a mountain cut portion may be formed on this member. In addition, in order to fix the adjustment plate 19, the cutout parts 30 and 31 are formed, but this is just an example, and the members that come into pressure contact with the adjustment plate 19 (in the embodiment, the upper part 26 of the gear holding member 26) _-2 ), the pressure contact surface between the adjustment plate 19 and the member may be formed with a rough surface to generate high friction, or the adjustment plate 19 and the pressure contact member may be configured to have a high friction surface. It is also conceivable to form it with a member.

According to the present invention, the scanning method of the document table 12 has been described. It can also be applied to scanning methods using optical means. Furthermore, although the microswitch MSW6 and the like are provided as detection means, optical detection means may also be used. That is, a configuration may be adopted in which a detection plate is provided to pass between the light emitting and light receiving elements, and the detection plate blocks the light from the light emitting elements so that it does not reach the light receiving elements. Alternatively, the light from the light emitting element may be reflected when passing through the detection plate, and the light may be received by the light receiving element.

<Effects> As explained above, according to the transfer material leading edge adjustment device of the present invention, the detection plate that operates the detection means for starting conveyance of the transfer material can be adjusted to the desired position by rotating the adjustment gear. It can be moved to a different position, the position can be adjusted more precisely, and the operation for that purpose is extremely simple.

In particular, all you have to do is unfix the adjustment gear and rotate it, and the adjustment gear is fixed in that position after adjustment, so it is very easy to operate, and it is easy to move the detection plate after adjustment. The danger is gone.

[Brief explanation of the drawing]

FIG. 1 is a top view showing a specific example of an adjustment device for adjusting the conveyance timing of a transfer material according to the present invention, FIG. 2 is a side sectional view of FIG. 1, and FIG.
4 is a cross-sectional view showing the temperature sensor of the present invention attached to the document table; FIG. 5 is a cross-sectional view showing an example of the adjusting plate fixing mechanism of the present invention; and FIG. 6 is a cross-sectional view of the temperature sensor of the present invention. FIG. 7 is a cross-sectional view showing another example of the fixing mechanism after adjustment, FIG. 7 is a diagram for explaining the installation state shown in FIG. 6, and FIG. Schematic diagrams shown in Figures 9 and 1
FIG. 0 is a top view and a side view showing an example of a conventional transfer material leading edge position adjustment mechanism. 11...Wire fixing plate, 12...Document stand, 14
...Transparent glass plate, 18...Detection plate, 19...Adjustment plate, 20...Guide hole, 22...Rack part, 2
3... Adjustment gear, 26... Gear holding member, 29
... Stopper, 30, 31 ... Mountain cutting section.

Claims (1)

[Claims for Utility Model Registration] In order to convey the transfer material that is stopped at a fixed position to the transfer position of the recording medium on which an image is formed, a detection means that is activated by the movement of the document scanning means is provided. The conveyance of the transfer material stopped at the fixed position is started by the operation of the detection means, and the conveyance is controlled so that the leading edge of the transfer material and the leading edge of the image formed on the recording medium coincide at the transfer position. The leading edge of the transfer material is provided with the detecting plate or the detecting means movably so as to freely adjust the positional relationship between the detecting means and the detecting plate for activating the detecting means provided in the document scanning means. In the position adjustment device, the above-mentioned detection means is arranged on the movement path of the above-mentioned document scanning means; the detection plate provided movably in the scanning direction; an adjustment member integrally formed with the detection plate and having a rack portion for moving the detection plate in the scanning direction of the document scanning means; and a rack portion of the adjustment member. It has an adjustment gear rotatably held that meshes with the adjustment gear, and upper and lower holding parts that hold both sides of the adjustment gear, and the lower holding part moves the adjustment gear toward the upper holding part. A transfer characterized by comprising: a gear holding member that is pushed up; and a fixing member that is interposed between the upper holding portion of the gear holding member and the adjustment gear and restricts rotation of the adjustment gear. Material tip position adjustment device.