JPS6022350Y2 - Conveyance device for dry type diazo copying machine - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a conveying device for a dry type diazo copying machine that includes a developing chamber and an endless belt-like conveying member that conveys photosensitive paper while bringing it into contact with developing gas in the developing chamber.

Conventional devices of this type have the mounting position of the shaft arm on the sleeve drive roller in order to maintain a predetermined distance between the developing chamber and the endless belt-shaped transport member, so-called sleeve, for transporting the photosensitive paper. The tension of the sleeve can be adjusted by adjusting it with a screw, or the rotation of a receiving roller placed on the photosensitive paper introduction side and rotated by the drive of the sleeve can be suppressed with a spring, thereby adjusting the tension of the sleeve. Tension was applied to the photosensitive paper transport section from the roller to the drive roller.

However, since both act on both ends of the roller, even when the sleeve is not worn out, tension is applied to the center compared to both ends. It is difficult to make the force uniform, and the sleeve wears out with use, but this wear cannot be uniform across the width of the sleeve, so the tension on the sleeve becomes increasingly uneven, and as a result, photosensitive The paper may be easily conveyed diagonally (skewed), the entire photosensitive paper may be difficult to come into contact with the developing gas evenly and to an appropriate extent, the photosensitive paper may be wrinkled after development, or the photosensitive paper may be skewed during subsequent transport by rolls. There were various drawbacks such as breakage.

This invention eliminates the drawbacks of the above-mentioned conventional devices and provides a conveying device for a dry type diazo copying machine with high conveyance reliability, which uniformizes the tension of the sleeve and thereby properly conveys the photosensitive paper. The purpose is to

This invention will be explained with reference to embodiments shown in the drawings.

In FIG. 1, 1 is a developing chamber filled with a developing gas consisting of ammonia gas and water vapor obtained by dropping ammonia water into the interior and vaporizing it by heating, and 2 is a developing chamber that is rotated by a driving member (not shown). A driving roller, 3 a receiving roller, 4 a tension roller, 5 an auxiliary roller, 6 an endless belt-shaped sleeve mounted on the rollers 2 to 5, and conveying the photosensitive paper 7 by the rotation of the driving roller 2; It is made of rubber, for example, and has a width larger than the width of the photosensitive paper 7 to be handled.

As shown in Fig. 2, the rollers 2 to 5 all have a tapered shape with the diameter being the largest at the center and gradually becoming thinner as they approach both ends, and the size of the taper is determined by the angle θ shown in the figure. Preferably, θ=3 to 5°.

As shown in FIGS. 3 and 4, arms 8 are attached to both ends of a roller shaft 3' that rotatably supports the receiving roller 3.
One end of a spring 9 is attached to the arm 8, and the other end of the spring 9 is attached to an appropriate location on a frame (not shown), so that the receiving roller 3 is biased by the spring 9 in a direction substantially perpendicular to the axis, and is urged against the sleeve 6. It is designed to apply tension.

The tension roller 4 and the auxiliary roller 5 are shaped square rollers for holding the sleeve 6 in the illustrated shape. In particular, the tension roller 4, like the receiving roller 3, biases both end arms of the roller shaft with a spring to hold the sleeve 6 in the shape shown in the figure. It is preferable to apply tension to 6.

When the photosensitive paper 7 is introduced into the sleeve 6 from the receiving roller 3 side, the photosensitive paper 7 is conveyed on the sleeve 6 and is developed by coming into contact with the developing gas in the developing chamber 1. It will be discharged towards the process.

Since the rollers 2 to 5 are tapered as shown in the figure, tension is applied to the sleeve 6 almost uniformly in its width direction, and this tension is maintained in an appropriate direction by the action of the spring 9. The paper 7 is transported properly and reliably, and the entire surface is uniformly developed.

In the above embodiment, the rollers 2 to 5 are formed in a tapered shape, but they may be formed in a shape where the thickness is maximum at the center and becomes thinner non-linearly as it approaches both ends. Needless to say, this invention does not necessarily need to be provided, and various changes and modifications of the above embodiments are possible.

Since this device is constructed as described above, it is possible to apply tension to the sleeve almost uniformly in its width direction, so that the tension of the sleeve and therefore the photosensitive paper conveying force can be kept substantially uniform. Since the abrasion is almost uniform in the width direction, the photosensitive paper can always be transported properly and reliably, and the entire photosensitive paper can be uniformly brought into contact with the developing gas to an appropriate extent and developed. Good copies can always be obtained, and since the receiver can apply tension to the conveying member according to the load using the urging member attached to the roller and tension roller, the durability of the conveying member can be increased. In addition, it has excellent effects such as equalizing the tension during conveyance of weak paper such as air mail paper and eliminating the risk of paper jams.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway schematic side view showing an embodiment of this invention, Fig. 2 is a front view of the roller, Fig. 3 is an enlarged side view of the main part of Fig. 1, and Fig. 4 is a schematic side view of the roller. FIG. 3 is a plan view of FIG. 1...Development chamber, 2...Drive roller, 3
...Receiving roller, 6...Sleeve, 7.
...Photosensitive paper, 8...Arm, 9...
...Spring.

Claims (1)

[Scope of utility model registration request] A developing chamber whose interior is maintained in a developing gas atmosphere, a drive roller placed adjacent to this developing chamber and rotatably attached to the machine frame, and a support that is stretched around multiple rollers such as rollers and tension rollers. In a dry type diazo copying machine equipped with an endless belt-like conveying member that conveys photosensitive paper while bringing it into contact with developing gas in a developing chamber by rotating the rollers, the thickness of the central portion of each roller is equal to the thickness of both ends. The bearings of the plurality of rollers are formed with elastic members interposed between the machine frame at both ends of the roller shaft of the roller and the tension roller, respectively, and the bearings of the plurality of rollers are formed to be slightly thicker than the tension roller. 1. A conveyance device for a dry type diazo copying machine, characterized in that the rollers are biased in a direction that applies tension to a conveyance member stretched between the rollers.