JPS5848655Y2 - Device to prevent misalignment between original drawing and photosensitive paper in diazo copying machine - Google Patents

Description

[Detailed description of the invention] The present invention is a diazo copying machine that has a printing section conveyance device and a developing section conveyance device separately. It is a device.

Conventionally, when copying a long item using a diazo copying machine, the speed of the developing section transport device was set somewhat higher than the speed of the printing section transport device to prevent the photosensitive paper from folding in the developing section. Back tension was applied to prevent the photosensitive paper from sagging between the printing section and the developing section, but if the holding force of the photosensitive paper in the printing section was small, the back tension would pull the photosensitive paper and cause it to deviate from the original image. This has the drawback of causing misalignment and blurring of the copied image.

The present invention creates slack in a long piece of photosensitive paper between the printing section transport device and the developing section transport device, and when the slack is removed, the photosensitive paper in that area is pulled. A strong force is applied to the printing section so that the photosensitive paper in the printing section does not deviate from the original image, thereby eliminating the drawbacks of the conventional method.

Next, an embodiment of the present invention shown in the accompanying drawings will be described in detail.

1 is an exposure cylinder having a light source inside, and 2 is an endless belt with a low-y-3,4°5.6 belt and is tightly wrapped around the exposure cylinder 1.

7 is a developing chamber, 8 is an Endrus belt, and rollers 9 and 10
．． 11 are arranged.

A downwardly curved pressing plate 12 is arranged between the rollers 3 and 11, a pin 13 fixed in the middle is pivotally connected to the housing, and a plurality of recessed notches 14 are provided at the left end of the pressing plate 12. pins 16 with a plurality of rollers 15 fixed at regular intervals.
are fixed so that each roller 15 is positioned in each recessed notch 14, and when the right end of the pressing plate 12 rotates upward, each roller 15 comes into pressure contact with the roller 3.

17 is a guide plate fixed below the pressing plate 12 along the pressing plate 12, and 18 is an original drawing and photosensitive paper insertion table 19 which is horizontally protruded from the front of the housing.

Next, the effect will be explained.

The long photosensitive paper 20 is inserted between the exposure drum 1 and the endless belt 2 from the insertion table 18, and is brought into close contact with the exposure drum 1.
Upper roller 3 and roller 15 along endless belt 2
It is inserted between the pressing plate 12 and the guide plate 17 from between, and then sent from the roller 11 portion along the endless belt 8 to the developing chamber 7 and pulled out from the upper roller 9.

The original image 21 is placed on the elongated photosensitive paper 20 on the insertion table 18 , is overlapped with the elongated photosensitive paper 20 by the endless belt 2 at the exposure drum 1 , and is separated into the original image separating section 19 . .

Initially, the long photosensitive paper 20 is moved along the guide plate 17 to the pressure plate 1.
2, a curved sag is produced as shown in FIG.

Therefore, endless belt 8 or endless belt 2
Although the endless belt 8 is driven somewhat faster, the tension of the endless belt 8 is absorbed by the slack and is not transmitted to the long photosensitive paper 20 in the endless belt 2 portion. Since the paper 20 is conveyed only by the endless belt 2, the original 21 and the long photosensitive paper 20 do not become separated from each other.

After a certain period of time, the slack is completely absorbed and the pressing plate 12 rotates counterclockwise around the pin 13 as shown in FIG.
A roller 15 is pressed against the roller 3 and presses the long photosensitive paper 20 passing therebetween against the roller 3.

Therefore, the long photosensitive paper 20 in the printing section is pulled and given back tension by the long photosensitive paper 20 in the developing section, but is pressed by the rollers 15 so that the long photosensitive paper 20 in the printing section does not shift from the endless belt 2. Therefore, the long photosensitive paper 20 in the printing section is conveyed at the same speed as the endless belt 2 while being given back tension, and does not deviate from the original image 21.

[Brief explanation of drawings]

Fig. 1 is a front view showing the entire interior of a diazo copying machine equipped with the device of the present invention, Fig. 2 is a perspective view of the pressing plate of the device of the present invention, and Fig. 4
The figure is an explanatory diagram of the operation. 1...Exposure drum, 2...Endless belt, 3...Roller, 12...Press plate, 13...Pin, 15... ...Koro,
20... Long photosensitive paper, 21... Original drawing.

Claims (1)

[Scope of utility model registration request] A pressure plate for curving the photosensitive paper downward is provided between the photosensitive paper discharge section of the printing section conveyance device and the photosensitive paper feed section of the development section conveyance device, and the intermediate portion thereof is pivotally mounted, and a conveyance roller is attached to one end of the press plate for bending the photosensitive paper downward. This device is installed in such a way that it can press against the conveying endless belt of the printing section conveyance device, and the conveyance speed of the developing section is higher than that of the printing section.