JPH0432677Y2 - - Google Patents

Description

[Detailed description of the invention] <Technical field> The present invention utilizes the movement of a means for optically scanning a placed original, especially in a copying machine, etc.
The present invention relates to an adjustment device for controlling the conveyance timing of a transfer material when an image formed on a recording medium is transferred to the transfer material.

<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 one example, conventionally, 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 a disc.
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 is given to correcting the formation position of the slit. In addition, the cam plate or synchronization disk is not only provided to control the conveyance timing of the transfer material, but also provides a synchronization signal to know the operating status of the copying machine and a signal to control other copying processes. It is used to obtain. 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. 5 is a schematic diagram showing a specific example of the scanning means.
It moves the 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 operation 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.

Therefore, 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 this microswitch MS6 is activated, the document table 1 is moved in the direction B again, and the second detection plate 3 that detects the overrun state restarts the microswitch MS6, thereby stopping the movement of the document table 1. , this state is shown in . 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 micro switch MSW6 is activated to start conveying the transfer material. Adjusted to fit the copy machine. 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 to adjust the conveyance timing of the transfer material. A specific example of this is shown in FIGS. 6 and 7. 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. Also, the detection plate 2 has screws 6
It is fixed to the glass support plate 5 via the elongated hole 4 at.

Therefore, the detection plate 2 is adjusted by loosening the screw 6, moving the detection plate 2 to a predetermined position to the left or right, and then tightening the screw 6 again. Although this method certainly makes the adjustment easier than adjusting the arrangement position of microswitches, it still takes time and effort, and the work efficiency has not been improved much. 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 easy and 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 mechanism for adjusting the transfer timing of a transfer material 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 fixed position of the fixed plate 1 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 placed 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 copying machine 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. Further, the detection plate 18 integrally formed with the adjustment plate 19 has a guide hole 20 as shown in FIGS. 2 and 3.
The micro switch MSW 6 protrudes from the back side of the fixing plate 11 through the
facing each other so as to operate. A member 21 that corresponds to the detection plate 18 and constitutes the rear end 2b of the detection plate 2 shown in FIG. 5 is fixed to the back surface of the fixed plate 11.
The member 21 is formed with a stepped portion 21 _-1 for connecting with the detection plate 18 so as not to hinder the movement of the detection plate 18, and the bifurcated portion 18 _-1 is formed so as to sandwich the stepped portion 21 ₁ . It is formed on the detection plate 18. Due to the movement of the adjusting plate 19, the bifurcated portion 18 of the detection plate 18
_-1 and the step portion 21 _-1 of the member 21 changes. In this case, a protrusion 19 _-1 is formed on the adjustment plate 19 to stabilize the movement of the adjustment plate 19 relative to the guide hole 20 and to prevent further movement to the left in the figure. Further, movement of the adjustment plate 19 in the right direction is restricted by the adjustment plate 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 adjusting gear 23 has a head 24 having a groove on the upper surface for rotating the gear 23 on the upper part of the shaft, and the lower part of the shaft is connected to the fixing plate 1.
It is inserted into a circular hole formed in 1 and is rotatably provided. This adjustment gear 23 is connected to the fixed plate 11
Both sides of the gear 23 are held in such a way by a gear holding member 26 fixed with screws 25, and the gear 23 is 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. Moreover, the head 24 of the adjustment gear 23 corresponds to the opening 28 formed in the glass support 13, and as shown in FIG. is facilitated.

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 (reciprocated) in the document scanning direction, and the document image on the recording medium that rotates with it is transferred via optical means (not shown). image is formed.

In order to start conveying the transfer material at the fixed position while the document table 12 is moving (reciprocating), the micro switch MSW6 detects so that the leading edge of the image formation on the recording medium and the leading edge of the transfer material match at the transfer position. It is activated by plate 18. 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. Therefore, as shown in Figure 4-
The adjusting gear 23 is rotated by inserting a screwdriver or the like through the hole 28, inserting it into the groove of the head 24 of the shaft portion of the adjusting gear 23, and rotating it clockwise in FIG. As a result, the adjustment plate 19 is moved to the left in the figure, and the detection plate 1 is moved as shown in FIG.
8 approaches the micro switch MSW6. Therefore, the operation of the microswitch MS6, which starts conveyance of the transfer material, becomes faster, and the timing of conveyance of 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 purpose, 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. This delays the start of conveyance of the transfer material and allows adjustment so that the leading edge of the transfer material and the leading edge of the image formation on the recording medium coincide 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.

According to the present invention, although the scanning method using the document table 12 has been described, it is also applicable to a scanning method using optical means.

Moreover, a micro switch is used as a detection means.
Although the MSW 6 and the like are provided, an 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.

<Effect> 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 any position, making it very easy to make more precise position adjustments.

In addition, after adjustment, the head of the shaft of the adjustment gear does not protrude beyond a part of the document scanning means, so there is no possibility of misalignment caused by careless touching, making adjustment work easier. Become.

[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. 3 is a back view of FIG. 1. , FIG. 4 is a cross-sectional view showing the device of the present invention attached to a document table, FIG. 5 is a schematic diagram showing an example of transfer material conveyance control according to the present invention, and FIGS. FIG. 7 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, 13
...Glass support, 14...Transparent glass plate, 18
...detection plate, 19 ...adjustment plate, 20 ... guide hole, 22 ... rack part, 23 ... adjustment gear, 2
6...Gear holding member.

Claims (1)

[Scope of Claim for Utility Model Registration] In order to convey the transfer material stopped at a fixed position to the transfer position of the recording medium on which the image is formed, a document scanning means provided in the document scanning means moves the document scanning means. A detection means operated by a detection plate is provided, and when the detection means is operated, the conveyance of the transfer material stopped at the above-mentioned localization value is started, and the leading edge of the transfer material and the leading edge of the image formed on the recording medium are connected. The apparatus controls the conveyance so that they coincide at the transfer position, and the detection plate is movably provided in order to freely adjust the positional relationship between the detection plate provided on the document scanning means and the detection means. In the transfer material leading edge position adjustment device, the detection means is arranged on the movement path of the document scanning device; the detection device is activated when the document scanning device moves, and the document scanning device corresponds to the detection device; the detection plate provided movably in the scanning direction of the document scanning means; and an adjustment member having a rack portion integrally provided with the detection plate for moving the detection plate in the scanning direction of the document scanning device; , an adjustment gear rotatably supported by a part of the document scanning means so as to be rotatably engaged with a rack portion of the adjustment member; and a shaft portion rotatably supporting the adjustment gear, the shaft portion rotatably supporting the adjustment gear; A transfer material leading edge position adjustment device comprising: a head for rotating an adjustment gear provided without protruding from a part of a document scanning means;