JPH0342438Y2 - - Google Patents

Description

[Detailed Description of the Invention] Field of the Invention The present invention provides a developing device for a copying machine that develops photosensitive paper after exposure and printing with a developer, in particular, a developer supply roll, a developer application roll, and a pressure roll.
The present invention relates to a developing device of a copying machine provided with means for bringing into contact and releasing contact, respectively.

Prior Art In a copying machine that has a developer supply roll, a developer application roll, and a pressure roll in its developing device, it is necessary to maintain the three rolls in a separate state when the copying machine is not in use. . This is because if these three rolls are placed in a closely pressed state, the rolls will lose their roundness, which may cause a defective copy image. For this reason, devices that can freely bring the three rolls into and out of contact have been proposed.

Such a conventional example will be explained with reference to the attached FIG. 1. In FIG. 1, a developer is stored or stored in a developer storage means (or a developer storage tray) 10, and a developer supply roll (hereinafter simply referred to as a supply roll) 12 is placed so that its lower part is immersed in the developer. It is set up. A developer application roll (hereinafter simply referred to as application roll) 14 is provided in contact with the supply roll 12 , and a pressure roll 16 is provided in contact with the application roll 14 . The supply roll 12 is rotated by being given a rotational force by a drive device (not shown), the coating roll 14 is driven by the supply roll 12, and the pressure roll 16 is rotated by the application roll 14, respectively. The photosensitive paper that has been exposed and printed is conveyed between a coating roll 14 and a pressure roll 16, where it is developed. By the way, in the conventional example described above, a lever 22 supported by a shaft 20 is provided in order to selectively bring the rolls 12, 14, and 16 into contact with each other or release the rolls from contact with each other. Figure 1 shows
The state in which the rolls 12, 14, and 16 are in pressure contact with each other is shown. The application roll 14 and the pressure roll 16 are movable only in the vertical direction, but
In the state shown in FIG. 1, it is pushed up by the supply roll 12, and the supply roll 12, application roll 14, and pressure roll 16 are in pressure contact. To release the contact between the rolls 12, 14, and 16 from this state, one end 24 of the lever 22 is raised in the A direction. Then, the supply roll 12 is lowered, and the application roll 14 and pressure roll 16 are also lowered. However, the amount of downward movement of the rolls 12, 14 and 16 is
If the size is increased in this order so that each roll is separated, the three rolls will be in a separated state. On the other hand, in order to bring the separated rolls into pressure contact, when the end 2 of the lever 22 is lowered in the direction B, the supply roll 12 is raised, and the supply roll 12
The applicator roll 14 and the pressure roll 16 move upward in order so as to be pushed up and come into pressure contact.

By the way, in the above-mentioned B direction, the end portion 24 of the lever 22 is urged by a suitable spring to move the roll 12,
14 and 16 are brought into pressure contact, and in the A direction,
An electromagnetic drive using a solenoid coil and a cam move the end 24 upwardly to release the three rolls from contact. However, a mechanism consisting of an electromagnetic drive device and a cam is complicated, is expensive, and cannot be said to be highly reliable. Therefore, if there is a failure in this mechanism consisting of the electromagnetic device and the cam, the rolls 12, 14 and 16 will remain in pressure contact, resulting in poor roundness of the rolls and defective copied images, as described above. become the cause. Furthermore, the method of maintaining the rolls in close contact using springs is not very reliable, and in some cases there is a risk that the rolls will not be in close contact with each other and good copying will not be possible.

Purpose of the invention Therefore, the purpose of the present invention is to provide a simple manual mechanism for pressurized contact and contact release of the supply roll 12, applicator roll 14, and pressure roll 16 at low manufacturing cost and with extremely high reliability. It is an object of the present invention to provide a developing device for a copying machine which can be reliably developed.

Summary of the invention The invention consists of a developer storage means for storing a developer, a developer supply roll provided so that its lower part is immersed in the developer, and a developer application roll provided adjacent to the developer supply roll. , a developing device for a copying machine having a pressure roll provided adjacent to the developer application roll, a first guide opening having an inclined part for vertically guiding an axis of the developer application roll, and a pressure roll; The present invention relates to a developing device for a copying machine including a roll contact/release means having a second guide opening having an inclined portion for vertically guiding the shaft of the copying machine.

DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the attached FIGS. 2 to 4. FIG. 2 is a simplified perspective view illustrating the state in which the supply roll 12, coating roll 14, and pressure roll 16 are in elastic pressure contact, and FIG. 3 shows the state of the rolls shown in FIG. FIG. 4 is a diagram for easily explaining the state in which the three rolls mentioned above are released from contact. Components shown in FIGS. 2 to 4 that correspond to those shown in FIG. 1 are given the same reference numerals.

In FIG. 2, the supply roll 12 is provided so that its lower part is immersed in the developer stored in the developer storage means 10, as in the case of FIG.
Note that the shaft of the supply roll 12 is omitted in the drawing. The respective shafts of the applicator roll 14 and the pressure roll 16 are movable only in the vertical direction by shaft position regulating means 26 extending from the developer storage means 10, and the shafts of the rolls 14 and 16 are movable in the axial direction. Appropriate means such as flanges are provided to prevent movement of the A gear 28 is provided at one end of the shaft of the applicator roll 14, and a driving force is applied to the roll 14 from a drive device (not shown) of the copying machine through a chain 30 attached to the gear 28. As shown in FIGS. 2 and 3, when the three rolls are in elastic contact, the supply roll 12 and the pressure roll 16 rotate following the application roll 14.
The axes of the applicator roll 14 and the pressure roll 16 further pass through first and second guide openings 34, 36, respectively, of the roll contact/contact release means 32, which are directly related to the present invention. The shaft position is specified by the shaft position regulating means 26. In the case of FIGS. 2 and 3, that is, when the copying machine is used, the axes of the application roll 14 and the pressure roll 16 are located at the lower openings of the first and second guide openings 34 and 36, respectively. There is. Fixing means 38 and 4
0 is for fixing the roll contact/contact release means 32 so that the upper surface of the lower opening of each of the first and second guide openings 34, 36 presses the shafts of the rolls 14, 16 downward. It is something. Therefore, in the case of FIGS. 2 and 3, the rolls 12,
14 and 16 are in elastic pressure contact.

On the other hand, when the copying machine is not used, the roll contact/contact release means 32 is
When moving in the direction shown in the figure), first, the roll 14,
16 moves upward along the slopes (inclined parts) 42, 44 (see FIG. 3) of the opening of the roll contact/contact release means 32 due to its elastic force (the elastic force of the roll 12 is also involved), The elastic contact between rolls 14, 16 and 12 is released. Further, when the roll contact/contact release means 32 is moved in the C direction,
Rolls 14, 16, and 12 are released from contact, and the axes of rolls 14, 16 are supported by their own weight on the lower surfaces 46, 48 of the upper opening, respectively (the fourth
figure). The upper openings of the first and second guide openings 34 and 36 are arranged such that the upward movement distance of the pressure roll 16 is
Since the distance is greater than the upward movement distance of the application roll 14, the contact between the supply roll 12, the application roll 14, and the pressure roll 16 is reliably released.

Effects of the invention According to the invention, unlike conventional examples, a mechanism such as a spring, an electromagnetic device, a cam, etc. is not used, and a manual device with a simple configuration is used to bring the supply roll, coating roll, and pressure roll into contact. Since we are in the process of canceling the
It is possible to control pressurized contact and release of rolls in a developing device of a copying machine at low cost and with high reliability.

Modification of the Embodiment In the above description, the application roll 14 is driven, but the present invention is not limited to this, and the supply roll 12 may be driven. Furthermore, although the end of the opening of the roll contact/contact release means 32 is open, it may be closed. Furthermore, roll contact/contact release means 32
Although the means 32 is attached to the developer storage means 10, the means 32 may be provided independently from the developer storage means 10.

[Brief explanation of the drawing]

FIG. 1 is a simplified perspective view for explaining a conventional example;
Fig. 2 is a simplified perspective view for explaining the present invention, Fig. 3 is a view for explaining the state of the rolls shown in Fig. 2 in an easy-to-understand manner, and Fig. 4 shows the contact between the three rolls mentioned above. FIG. 3 is a diagram for explaining a released state in an easy-to-understand manner. 10: developer storage means, 12: developer supply roll, 14: developer application roll, 16: pressure roll, 32: roll contact/contact release means.

Claims (1)

[Scope of Claim for Utility Model Registration] A developer storage means for storing a developer, a developer supply roll provided so that its lower part is immersed in the developer, and a developer application that is pressed onto the upper part of the developer supply roll during development. In a developing device for a copying machine, which has a roll and a pressure roll that presses against the upper part of the developer application roll during development, a first guide having a first slope that guides an axis of the developer application roll in the vertical direction. and a second guide opening having a second slope that guides the axis of the pressure roll in the vertical direction, the slope of the second slope being greater than the slope of the first slope. 1. A developing device for a copying machine, characterized in that the distance of upward movement of the pressure roll is greater than the distance of upward movement of the application roll.