JPS584224B2 - gear release device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gear release device for a copying machine or the like.

For example, in a wet type diazo copying machine as shown in FIG.
Both the original and the sheet as a recording medium are fed through an inlet 1, exposed while passing through an exposure section 2, and then ejected from an intermediate outlet 3.

Here, the original is collected, and only the exposed sheet is successively fed through the intermediate feeding port 4, reversed by the reversing conveyance section 5, and then guided by the sheet guide plate 6 to the developing section 7.
sent to.

The sheet is developed in the developing section 7 while passing between the pressure roller 7a and the developing roller 7b to which the developer is attached, and is discharged from the sheet discharge port 8, where a copied sheet is obtained. .

However, in such a developing method, a problem sometimes occurs in which a wet and weak sheet gets wrapped around the developing roller 7b and the like.

Conventionally, when a sheet is wrapped around the developing roller 7b, etc., the procedure is to turn off the main switch, open the cover of the copying machine body, remove the cover of the developing section 7, and remove the developing section 7, which is directly connected to the power source. Move the drive gear of roller 7 in the axial direction by hand to cut off the power transmission, continue to rotate, and stop at a position where the rear end of the wrapped sheet can be seen. After that, gently move the rolled sheet with both hands. It was pulled out and removed.

However, when the switch is turned off, the developing roller 7b
Since the sheet remains directly connected to the drive source, it cannot be easily rotated, but when taking out the wrapped sheet, it is often difficult to understand how to first release the transmission of the drive gear.

For this reason, the operator may neglect to remove the sheet, or if the operator tries to forcefully remove the sheet, the sheet may be torn during removal, resulting in paper particles remaining in the developing tray, blocking the developer circulation opening and preventing the next copy from being made. This may cause the sheet to be defective, or the roller may be damaged by inserting a knife or the like into the wound sheet to try to remove it.

Furthermore, even if the sheet is successfully taken out, if the user forgets to return the transmission release of the drive gear to the original transmission state and continues to use the sheet, the conveyance of the sheet in the developing section 7 has stopped and the sheet is removed. However, there were quite a number of cases in which the toner jammed in the developing section 7.

Furthermore, there were many cases where a service person was called or the equipment was left unused because it was not clear.

The present invention has been made in view of the above-mentioned circumstances, and it is possible to easily release the driven system including the developing roller 7 from the drive system when necessary, such as when a sheet is wrapped around the developing roller 7. The purpose of the present invention is to provide a gear release device that allows the following.

Embodiments of the present invention will be described in detail below with reference to the drawings.

For convenience of explanation, the pair of cams will be explained using simple shapes as shown in FIGS. 3, 4, and 6 to 9, which are not directly related to the embodiments of the present invention. However, regarding the pair of cams according to the present invention, see FIGS. 10 to 1.
This will be explained based on Figure 2.

In FIGS. 2 to 4, reference numeral 9 is a drive gear connected to a power source (not shown), and reference numeral 10 is a drive gear 9.
The reference numeral 11 indicates an intermediate gear that meshes with the intermediate gear 10, and a driven gear that meshes with the intermediate gear 10.

The drive gear 9 is rotatably mounted on a shaft 13 fixedly supported by the side plate 12.

On the other hand, the intermediate gear 10 is slidably and rotatably mounted on an intermediate shaft 15 fixedly supported between a side plate 12 and a side plate 14 facing the side plate 12.

Further, an extensible coil spring 16 as a pressing means is mounted between the side plate 12 and the intermediate gear 10 so as to wrap around the intermediate shaft 15.

This spring 16 gives the intermediate gear 10 a movement habit of moving in the opposite direction to the direction from the intermediate gear 10 toward the position where the side plate 12 is disposed.

A pair of cams 17 is inserted between the intermediate gear 10 and the side plate 14 and installed through the intermediate shaft 15, and the existence of the pair of cams 17 prevents the intermediate gear 10 from moving due to the movement behavior described above due to the spring 16. has been done.

The pair of cams 17 consists of a combination of two cams. One of them is a rotary cam 19 that is rotated in conjunction with a control lever 18 (see FIG. 5) that controls on/off of the drive system such as the drive gear 9, and this is disposed on the side plate 14 side. It is set up.

The other cam is a sliding cam 20 arranged between the intermediate gear 10 and the rotating cam 19.

Note that the details of the shapes of the rotating cam 19 and the sliding cam 20 will be described later.

The driven gear 11 is secured to a shaft 21 rotatably supported by the side plate 12 with a key 220, and is configured to rotate integrally with the shaft 21.

Further, a developing roller 7b is attached to the other end of the shaft 21, substantially integrally with the shaft 21.

Therefore, the intermediate gear 10 includes the drive gear 9 and the driven gear 11.
In the meshed state, as shown in FIGS. 2 and 3, the rotation of the driving gear 9 is transmitted to the driven gear 11 via the intermediate gear 10, and the developing roller 7b is rotated.

Accordingly, it is in pressure contact with the developing roller 7b,
Further, the application roller 23, a portion of which is immersed in the developer 22, is also rotated to supply the developer 22 to the developing roller 7b.

As shown in FIG. 2, a guide cover 27 is provided on the left side of the developing roller 7b, the left end of which is pivotally supported by a shaft 25, and the center part of which is locked with a stay 26.

This guide cover 27 is for guiding the developed sheet, and is normally locked to the stay 26.
When the sheet is wrapped around the developing roller 7b, it can be opened by rotating around the shaft 25 as necessary.
This allows the user to bring his or her hand near the developing roller 7b.

Now, in FIG. 2, a guide shaft 28 is shown between the side plates 12 and 14 directly below the intermediate shaft 15 and parallel to the intermediate shaft 15.

This guide shaft 28 has an arm 20 integrated with the sliding cam 20.
A concave rotation prevention portion 20b formed at the tip of the portion a is engaged (see FIGS. 2 and 6).

As described above, the sliding cam 20 is inserted through the intermediate shaft 15.

If this inserted hole is called a guide part 20c (see FIG. 6), this sliding cam 20 is prevented from rotating by a rotation preventing part 20b, and is guided by the guide part 20c. It can be slid in the axial direction of the intermediate shaft 15.

On the other hand, the rotary cam 19 is also formed with an arm 19a.

A pin 19b is implanted at the tip of this arm 19a.

As shown in FIG. 5, the control lever 18 is attached to the pin 19b.
is engaged with a long hole 29 formed at the tip.

The control lever 18 can be rotated about the shaft 30 in the direction of the arrow.

In the configuration shown in FIG. 5, it is clear that when the control lever 18 is rotated, the arm 19a, that is, the rotation cam 19, is rotated around the intermediate shaft 15.

Note that the control lever 18 is omitted in FIGS. 3 and 4 to avoid complication of the drawings.

Next, the details of the shape of the pair of cams 17 will be explained.

The axis line of the intermediate shaft 15 is indicated by the symbol AA in FIGS. 6 to 12.

The sliding cam 20 shown in FIG. 6 is formed with a working surface 31 that is angled with respect to a plane perpendicular to the axis AA.

Both longitudinal ends of this working surface 31 are connected to the axis A-
Surfaces 31a and 31b that are planes perpendicular to A are formed.

Since the arm 20a, the rotation prevention part 20b, the guide part 20c, etc. have already been described, their explanation will be omitted.

The rotary cam 19 shown in FIG.
, 31b are formed.

The above rotating cam 19 and sliding cam 20 are shown in FIGS. 3 and 4.
As shown in the figure, on the intermediate shaft 15, the mutual working surfaces 32
．． 31 are arranged to face each other.

Next, the operation of the present invention will be explained.

(1) Developing roller rotation status.

The operating surface 32, surfaces 32a, 32b of the rotating cam 19 are in contact with the operating surface 31, surfaces 31b, 31a of the sliding cam 20, respectively, and the intermediate gear 10 is rotated by the elasticity of the spring 16. is pressed against the side of the

In this position, the intermediate gear 10 meshes with the drive gear 9 and the driven gear 11 (see FIGS. 2 and 3).

Furthermore, the control lever 18 is in the position shown by the solid line in FIG. The rotation of the gear 9 is transmitted to the driven gear 11, and the developing roller 7b is in a rotating state.

(2) Developing roller released state.

In the developing roller rotation state described above, the control lever 18
When the drive gear 9 is pushed up toward the position shown by the imaginary line in FIG. 5, the drive source is switched off and the drive gear 9 stops rotating.

Then, as the control lever 18 rotates and moves, the pressure roller 7a is separated from the developing roller 7b (not shown).
Also, the arm 19a is rotated clockwise around the shaft 15.

At this time, the rotary cam 19 integrated with the arm 19a also rotates around the shaft 15.
can be rotated around.

At this time, the working surface 32 pushes the working surface 31 against the pressing force of the spring 16.

As a result, the intermediate gear 10 is also pushed and moved by the sliding cam 20, and the intermediate gear 10 and the driven gear 11 are disengaged from each other.

At the end of the stroke of the control lever 18, the working surface 31 and the working surface 32 are separated in a V-shape as shown in FIG.
The intermediate gear 10 is prevented by pressure contact with the driven gear 11.
It is held in a disengaged state.

(3) Return.

In the developing roller release state described above, if the control lever 18 is pushed down to the position shown by the solid line in FIG. Get started.

According to the present invention, under the rotating state of the developing roller, the developing roller 7
When a sheet wraps around b, the control lever 18
The wrapped sheet can be manually removed very easily by simply stopping the developing roller (turning off the copying machine) at the position where the trailing edge of the wrapped sheet is found.

FIG. 8 shows another example of the sliding cam.

This sliding cam 33 is different from the sliding cam 20 in that the concave rotation prevention part 20b is replaced with a hole-shaped rotation prevention part 33b, and the other shapes are different from the shape of the sliding cam 20. do not have.

Next, FIG. 9 shows still another example of the sliding cam.

The difference between this sliding cam 34 and the sliding cam 20.33 is that
The point is that a hole 35 is formed which has the functions of both the concave rotation prevention part 20b and the hole-shaped guide part 20c.

In this example, the straight portion of the hole 35 that fills a part of the circumference constitutes the rotation prevention portion 35b, and the entire hole constitutes the working interior.

When using this sliding cam 34, it is natural that the guide shaft 28
is unnecessary.

However, it is necessary to use an intermediate shaft that matches the shape of the hole 35.

10 to 12 are examples of sliding cams and rotating cams according to the present invention.

These cams are different from the cams shown in FIGS. 6 to 9 above in that the cylindrical end surfaces facing each other of the cams constituting the pair of cams are different from each other in any circumferential direction.
A plurality of, for example, two working surfaces 36 whose inclination direction is the same direction.
, 37 and top surfaces 38b1, 38b at both ends of each working surface.
2, 39b1, 39b2t 40b1, 40b2, and lower surfaces 38a1, 38a2, 39a1, 39
a2, 40a1, and 40a2.

Except for the above structural differences, the sliding cam 38 corresponds to the sliding cam 20, the rotating cam 39 corresponds to the rotating cam 19, and the sliding cam 40 corresponds to the sliding cam 33. It is also possible to construct a roller release device for a copying machine by using a sliding cam, not shown, which corresponds to FIG. Of course it's a good thing.

If the sliding cam and rotating cam shown in Figures 10 and 11 are adopted, each operating surface will be smaller than when using the sliding cam and rotating cam shown in Figures 6 and 7. The distribution of forces received is equalized, and the intermediate gear 10 can be slid more stably on the intermediate shaft 15.

Also, when the control lever is at the end of its stroke, i.e. when the copier is in the OFF state, the top surface 3 of the sliding cam 38
8b1 and the same surface 38b2 are the top surface 39 of the rotating cam 39
b1 and the same surface 39b2, this state can be stably maintained.

Then, the jammed paper can be removed without having to support and hold the control lever by hand.

Next, when the copying machine is turned on, that is, when the lever 18 is moved to the position indicated by the solid line, the rotary cam begins to rotate about the intermediate shaft 15.

Therefore, the contact relationship between the top surfaces 39b1, 39b2 of the rotating cam 39 and the top surfaces 38b1, 38b2 of the sliding cam 38 is released, and the boundary portions 39c1, 39c of the rotating cam 39 are released.
2 comes into contact with the inclined working surfaces 36 and 37 of the sliding cam 38 by the action of the spring 16, and the top surfaces 39b1 and 39b2 of the rotating cam 39 contact the bottom surface 38at of the sliding cam 38. , 38a2, the rotation of the rotary cam 39 is stopped.

This state corresponds to the state shown in FIG. 3,
Therefore, the intermediate gear 10 meshes with the driven gear 11, thereby transmitting driving force to the developing roller 7b.

As is clear from the above description, since the rotating cam 39 is always engaged with the sliding cam 38 through two substantially opposing portions, the intermediate gear 10 can more smoothly slide in the axial direction of the intermediate shaft 15. move.

[Brief explanation of the drawing]

FIG. 1 is a diagram schematically showing the configuration of a copying machine suitable for carrying out the present invention, FIG. 2 is a side view of a gear release device implemented in the copying machine, and FIG. 3 is a diagram showing a state in which the rollers are driven. 4 is a plan view of the same in the gear release state, FIG. 5 is a side view showing the operating state of the control lever, and FIGS. 6, 8, 9, 10, and 12 are FIGS. 7 and 11 are perspective views of various sliding cams, respectively, and FIGS. 7 and 11 are perspective views of various rotating cams, respectively. 9... Drive gear, 10... Intermediate gear,
11... Driven gear, 17... Counter cam,
39... Rotating cam, 38, 40... Sliding cam, 36, 37... Working surface.

Claims (1)

[Claims] 1. An intermediate gear disposed to mesh with the drive gear and the driven gear and slidable in the axial direction of the support shaft, a pressing means for urging the intermediate gear in a predetermined direction, and an action of the pressing means. A gear release device comprising: a control means capable of moving the intermediate gear in a direction in which the intermediate gear is opposed; The gear is integrally formed with a developing roller that is in pressure contact with an application roller immersed in a developer solution, and the control means includes a sliding cam that is slidably provided on the support shaft and a slide cam that is slidably provided on the support shaft. It is constituted by a pair of cam means including a rotary cam rotatably provided on the shaft via a control lever, and each of the pair of cams is configured to rotate in any circumferential direction with respect to the cylindrical end face portions facing each other.
It has a plurality of working surfaces that are inclined in the same direction and are equally spaced on the circumference, and each working surface has a top surface and a bottom surface at both ends, so that the rotation By rotating the cam, the sliding cam is slid in the axial direction of the support shaft and in the direction against the biasing force of the pressing means due to the pressing action between the working surfaces, from the driving gear to the driven gear. A gear release device characterized in that the power transmission path of the gear is cut off and the developing roller can be freely rotated.