JPH0233239Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field) The present invention relates to a developing unit driving device for a copying machine in which the developing unit can be driven manually.

(Prior Art) In a copying machine, for example, a diazo copying machine, exposed photosensitive paper is passed between a pair of developing rollers (hereinafter referred to as a pair of developing rollers), and a developer is applied to the paper for development. There is. The developing roller pair that achieves this function is rotationally driven by an appropriate drive source via a rotation transmission mechanism using a gear train. If the photosensitive paper gets jammed between the developing roller pair, the free rotation of the developing roller pair is restricted by the gear train, so if you try to forcefully remove the photosensitive paper, the photosensitive paper may break. do.

(Purpose) The purpose of the present invention is to provide a developing section of a copying machine in which a pair of developing rollers can be rotated freely and manually so that when a paper jam occurs in the developing section, it can be easily removed. The purpose of the present invention is to provide a driving device.

(Structure) In order to achieve the above object, the present invention has a frictional force transmitting device interposed in a rotation transmission mechanism using a gear train that transmits drive from a drive source to a pair of developing rollers, and This device is characterized in that the gear portion provided on the manual operation knob is engaged with and disengaged from the gear after the force transmission device.

The present invention will be explained below based on one embodiment.

FIG. 1 shows a diazo copying machine which is an application example of the present invention. First, the original paper 0 is placed in the original paper insertion slot 12 while being aligned with the original drawing table 11 extending from the front of the copying machine 10 toward the front. When the original paper is inserted into the machine, the original paper is fed into the machine by the original paper feed roller pair 13, and the insertion of the original paper is detected by the original paper detection device 15 disposed in the original paper path 14, and the detection device Based on a signal from 15, one sheet of photosensitive paper S stacked and stored below the original paper table is fed out by paper feed roller 16.

The free ends 17a of the respective leading ends of the original paper and the photosensitive paper abut against a leading end aligning member 17 which is disposed so as to be movable forward and backward within the paper path, and the leading ends are aligned here. Immediately after the leading edges are aligned, the alignment member 17 rotates counterclockwise about the shaft 18 to open the passage between the original paper and the photosensitive paper, and at the same time, the presser roller 20, which had been separated upward from the feed roller 19, is moved. The overlapping original paper and photosensitive paper are pressed against a feed roller 19 and sent to an exposure section composed of an endless belt 21 and a transparent cylinder 22 for exposure.

As is well known, the transparent cylinder 22 is moved in the direction of arrow a by the above-mentioned endless belt 21 which is stretched around one belt drive roller 23 parallel to the transparent cylinder 22 and a plurality of guide rollers 24, 25, 26. It can be rotated.

The original paper 0 and the photosensitive paper S that have passed through the exposure section are guided by a guide receiving plate 27 and sent into a shifting device 30 consisting of a pair of rollers 28 and 29 rotating in the directions of the arrows. Of the pair of rollers, the roller 28 on the side that contacts the original paper has a circumferential speed that is approximately the same as the paper feed speed in the exposure section, and the other roller 29, that is, the roller on the side that makes contact with the photosensitive paper, has the paper feed speed in the exposure section. It is rotated at a circumferential speed somewhat higher than that of the Therefore, the original paper and the photosensitive paper fed into the shifting device advance with the leading edge of the photosensitive paper ahead of the leading edge of the original paper.

The leading edge of the preceding photosensitive paper is separated from the original paper by a separating rotary plate 31, and then separated by a roller 32,
Guide path 33, roller pair 34, swingable guide plate 35, roller 36, guide plate 37, roller 3
After passing through a pair of rollers 38 consisting of rollers 8a and 38b and being fed into the developing section 39 and developed there, the lower guide plate 40 and the upper guide plate 41 are used as copy paper.
The copy paper passes between the paper sheets and is discharged onto a copy paper tray 43 by a pair of copy paper discharge rollers 42 . on the other hand,
The original paper separated from the photosensitive paper is discharged onto an original paper holder (not shown) by a pair of rollers 44.

A copy paper path switching member 52 is disposed immediately after the copy paper ejection roller pair 42, and the copy paper path switching member 52 is in a first position where its lower end 52a is located above the nip of the paper ejection roller pair 42. and a second position where the lower end is located below the nip, as shown by the broken line 52A, and when it is placed in the first position, the paper is ejected by the paper ejection roller pair 42. The small-sized copy paper to be printed advances toward the copy paper tray 43 through the path switching member 52, and when it is placed in the second position, the large-sized copy paper passes through the path switching member 52. The member 52 is guided by the curved inner surface 52b in a direction that is reversed by 180 degrees with respect to the copy paper holder 43, and is guided by the copy paper guide section 94 formed on the top surface of the copy machine to the back side of the copy machine. proceed to the side.

The large-sized copy paper traveling along the copy paper guide section 94 passes through the rear passage 87 and the pair of transport rollers 8.
8 and is discharged to a copy paper storage tray 89.

The developing section 39 is composed of a developer container 201 and a group of rollers arranged vertically and in pressure contact with each other.
Of these, the application roller 203 and the back roller 2
04 constitutes a developing roller pair. The developer stored in the developer container 201 is transferred to the application roller 203 by the pumping roller 202, and the application roller 203 and the back roller 20
A developing solution is applied to the photosensitive paper passing between the photosensitive paper 4 and the photosensitive paper 4 to develop the photosensitive paper. The roller 205 is the back roller 2
This is a pressure roller for pressing 04 onto the application roller 203.

The peripheral speed of the application roller 203 is set to be slightly larger than the photosensitive paper transport speed in the exposure section and the peripheral speed of the photosensitive paper transport roller pair 38 . As shown in FIG. 2, each of the photosensitive paper transport rollers up to the transport roller pair 38 in front of the exposure section and the development section 39 is connected to a motor 207 and an endless timing belt driven by this motor in the direction of the arrow. The application roller 203 is connected to the roller 38a by a gear train 223. Therefore, the gear train 22
3, due to the rotation transmission error of the rotation transmission mechanism, the application roller 20 forming one of the developing roller pair
If the circumferential speed of No. 3 is smaller than the circumferential speed of the other photosensitive paper transport rollers, the photosensitive paper will sag between the roller pair 38 and the application roller 203.

When a roll of photosensitive paper is used, the length of the photosensitive paper to be developed becomes quite long, so the above-mentioned sag continues to increase, and eventually a paper jam occurs between the applicator roller 203 and the roller pair 38. In order to avoid such a situation, the application roller 203 and its driving member are frictionally coupled, and the circumferential speed of the application roller 203 is controlled by the pair of photosensitive paper transport rollers 38.
After the photosensitive paper is tensioned between the roller pair 38 and the applicator roller 203, slipping occurs between the applicator roller 203 and its driving member.

FIG. 3 shows a cross-sectional view of a gear train 223 in which a frictional force transmission device that causes the above-mentioned slippage is interposed. The timing belt 208 (FIG. 2) is passed through a fixed gear 215, an intermediate gear 216, a friction driven gear 217, a gear 218, a gear 219 that meshes with this gear 218, and a timing belt pulley 230 that is integrated with this gear 219. driven by.

One roller 38 of a roller pair 38 (FIG. 1) is attached to the shaft 231 on which the friction driven gear 217 is loosely fitted.
b is provided. The gear 218 is provided so as to be movable in the axial direction and integral with the shaft 231 in the rotational direction.
An extensible spring 232 is interposed between the friction driven gear 217 and the friction driven gear 217 . Gear 217 and shaft 23
A ring-shaped friction member 234 is provided between the shaft 231 and the disc 233 fixed to the drive gear 217 .

FIG. 4 shows another example of a frictional force transmission device. The shaft 231 of the roller 38b has a friction driven gear 23.
5 is loosely fitted, and this gear 235 and gear 23
A friction member 237 is interposed between 6 and 6. The gear 236 is movable in the axial direction with respect to the shaft 231 and is integral with the shaft 231 in the rotational direction.
Friction member 2
37 and is pressed against the gear 235.

When the coating roller 203 connected via the timing belt pulley 230 and the gear train 223 including the frictional force transmission device is subjected to a load due to the tension of the photosensitive paper described above, that is, this roller 2
03 and the back roller 204 increases, the frictional drive gear 21
7 (235) and the shaft 231, the friction member 234
Slip occurs via (237). Therefore, the tension of the photosensitive paper will not increase excessively, and its breakage will be avoided.

In order to easily take out the photosensitive paper when the developing roller pair consisting of the coating roller 203 and the back roller 204 becomes clogged with photosensitive paper, the coating roller driving gear train 223 is provided with a gear that can be freely engaged and disengaged. By engaging this gear with a gear train, the application roller 203 can be manually rotated.

In FIG. 3, the shaft 2 fixed to the side plate 214
A manual operation knob 243 integrally formed with a gear portion 244 is loosely fitted into the gear portion 24 .
4 and the side plate 214, the gear part 244 normally occupies a position outwardly removed from the gear after the frictional force transmission device, for example, the final gear 215. .

After pushing the knob 243 against the elasticity of the spring 245 and engaging the gear portion 244 with the gear 215, the photosensitive paper can be taken out from the pair of developing rollers by rotating the knob 243.

Conventionally, such a photosensitive paper removal operation has been performed by removing the intermediate gear 216 of the gear train from the gear train and rotating the coating roller.

According to this invention, since the gear train friction force transmission device is provided, there is no need to perform any operations such as removing the intermediate gear 216 from the gear train.

(Effects) As described above, the present invention enables the developing roller pair to be freely rotated manually in the developing unit driving device that drives the developing roller pair via a rotation transmission mechanism using a gear train. Even if a paper jam occurs in the photosensitive paper at the developing roller pair, it can be easily removed.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional configuration diagram of a diazo copying machine which is an application example of the present invention, Fig. 2 is a diagram showing the drive-related mechanism of the developing unit drive device according to the present invention, and Fig. 3 is a diagram showing the frictional force in the same drive device. FIG. 4 is a cross-sectional view of a gear train including a transmission device, and FIG. 4 is a cross-sectional view showing another example of the frictional force transmission device. 203, 204...Developing roller pair, 207...
...Motor, 208...Endless timing belt,
217...Friction driven gear, 219...Gear, 2
23...Gear train, 234...Friction member, 243...
...Manual operation knob, 244...Gear portion.

Claims (1)

[Scope of utility model registration request] A pair of developing rollers that apply a developer to develop the exposed photosensitive paper while conveying it, a drive source that rotationally drives the pair of developing rollers, and a rotational driving force from the drive source that transmits the rotational driving force to the pair of developing rollers. a frictional force transmitting device including a friction member that is interposed in a rotation transmission mechanism of the gear train and causes slippage when the rotational load on a pair of developing rollers increases; and a frictional force transmitting device of the gear train. A manual operation in which a gear portion that normally occupies a position outwardly displaced from subsequent gears is integrally formed, and the gear portion is pushed into engagement with the gear when manually rotating the pair of developing rollers. A developing unit drive device for a copying machine, comprising a knob.