JPS6241330Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a drum support device used in an electrostatic latent image forming device or the like.

A conventional drum supporting device will be described below by taking a photosensitive drum used in an electrophotographic system as an example.

First, a first conventional example will be explained with reference to FIGS. 1 and 2. Reference numeral 1 denotes a drum, and a hole 4 made in the center of the drum 1 is passed through a shaft 3 fixed to a frame 2 in a cantilever manner, and the free end of the shaft 3 is supported by a side plate 6 having a shaft hole 5 to support the drum 1. It has a structure that allows it to be mounted and supported.

However, with this structure, when the drum is removed from the shaft, the shaft becomes cantilevered and the drum is bent, which has the disadvantage of damaging the drum and making it difficult to remove the paper when it becomes jammed. There were flaws.

Therefore, as a second conventional example, Figs.
There is a drum support device shown in the figure, in which an upper unit 7 opens, a drum support 8 is provided below the drum 1, and a shaft 9 is inserted into a hole in the drum 1.
It has a structure that can be inserted and removed freely, and the system is such that the shaft 9 is removed and the drum 1 is dropped onto the drum receiver 8, and then the upper unit 7 is opened and the drum 1 is taken out.

Although this structure solves the drawbacks of the above-mentioned device, it has the disadvantage that the drum and shaft are separated, making it impossible to replace the drum with one touch, resulting in poor workability.

The purpose of this invention is to solve the above-mentioned drawbacks, and in a drum support device that can be divided into an upper unit and a lower unit, the shaft is attached to the drum so that its tip can move in and out, and only the shaft can be moved. It is characterized in that the drum can be attached and detached.

An embodiment of the present invention will be described below with reference to FIGS. 5 and 6. 10 is a drum, 11 is a drum shaft, which is supported by the drum 10 by a bearing 12;
One end, which is constantly tapered by a spring 13 supported by a support material, protrudes from the side surface of the drum 10, and by holding a handle 14 attached to the other end and pulling it against the force of the spring 13. The protruding ends no longer protrude from the sides of the drum 10.

A locking groove 15 is formed at the base of the handle 14 described above.

16 is a drum gear, 17 is a limiter, 18 is a stopper, and 19 is a drum receiving member, which is attached to the lower frame of the lower unit.

Reference numeral 20 designates an upper frame of the upper unit, on which drum bearings 21a and 21b are formed. As shown in FIG. 7, a notch 22 for fitting the drum shaft is formed in the drum bearing 21b and the upper frame 20 provided with the drum bearing 21b.

23 is a locking piece, and 24 is a bias roller.

Next, a method of attaching the drum with the above structure will be explained.

Pull the handle 14 and attach the end of the drum shaft 11 to the drum 1.
0 Pull inward to store the drum 10 in the lower unit, and place the drum 10 on the drum support material 19.
At this time, the end of the drum shaft 11 is connected to the drum bearing 21.
It is located approximately 0.5 mm to 1 mm below a and 21b.

Therefore, when the drum shaft 11 is pushed by holding the handle 14, the force of the spring 13 is also applied, and due to the taper of the end of the drum shaft 11, the drum shaft 1 is attached to the drum bearing 21a.
1 is inserted, and the drum 10 is lifted by 0.5 mm to 1 mm and separated from the drum receiving material 19. The drum 10 is positioned in the axial direction by the limiter 17 and the end of the handle 14. Once the position is determined, fit the locking piece 23 into the locking groove 15 of the handle 14 and remove the drum 1.
0 is fixed.

The drum 10 can be removed by reversing the above procedure.

According to the present invention having the above structure and operation, the drum can be replaced by simply moving the drum shaft a little, so the drum can be replaced with one touch and there is no risk of damaging the drum. It is suitable as a drum support device used in electrostatic latent image forming devices and the like.

[Brief explanation of the drawing]

Fig. 1 is a disassembled side view showing a conventional example, Fig. 2 is an assembled side view of the same, Fig. 3 is a side view showing another conventional example,
Fig. 4 is a side view of the conventional drum with its shaft removed, Fig. 5 is a sectional side view of an embodiment of the present invention with the drum shaft pulled out, and Fig. 6 is a side view of the drum with the drum attached. FIG. 7 is a side sectional view showing the upper frame and the notch of the drum bearing. 10...Drum, 11...Drum shaft, 13...
Spring, 14...Handle, 15...Latching groove, 18
...Stotsupa.

Claims (1)

[Scope of utility model registration request] In a drum support device used in an electrostatic latent image forming device, etc., in which a drum is pivotally supported on a frame of an upper unit that can be opened and closed relative to a lower unit, a drum shaft having a handle at the center of the drum is fitted so as to be movable in the axial direction. , a spring that constantly biases the drum shaft so that one end thereof protrudes from one side of the drum, and a spring that prevents the drum shaft from coming off the drum when the drum shaft is pulled against the spring by the handle. Attach each stopper,
a drum bearing into which one end of the drum shaft is inserted into the frame of the upper unit; a drum bearing into which the handle provided at the other end of the drum shaft is inserted;
A drum fitting notch is provided for attaching and detaching the drum shaft on the handle side to the frame, and a drum support material is provided in the frame of the lower unit on which the drum is placed when attaching and detaching the drum, and one end of the drum shaft is provided with a notch for fitting the drum on the frame. 1. A drum support device for use in an electrostatic latent image forming device, etc., characterized in that the drum is supported by inserting the and handle into drum bearings of an upper frame.