JPH02201364A - Image forming device - Google Patents

Abstract

PURPOSE:To pull out a paper feeding cassette without hitting a paper feeding mechanism when the cassette is pulled out by turning on an auxiliary power source when a main power source is turned off during the operation of the paper feeding mechanism, and controlling so that the paper feeding mechanism is returned to an initial position by the auxiliary power source. CONSTITUTION:When a main power source switch 52 is turned off during the operation of the paper feeding mechanism S, the main power source stops supplying a current to a control circuit C. In this case, a CPU 51 instructs a control part 50 to cause a battery backup circuit 56 as the auxiliary power source to operate a standby means so as to actuate the paper feeding mechanism S. The CPU 51 detects the present position of a suction unit by a signal from the encoder of a motor which actuates the paper feeding mechanism S, and instructs the motor of the control part 50 to return the paper feeding mechanism to the initial position. In this way, the suction unit is always returned to the raised initial position when the main power source is turned off. Thus, a paper feeding cassette containing developing paper can be pulled out.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image forming apparatus equipped with a control means for controlling a paper feeding device of a copying machine.

[Conventional technology]

Recently, photosensitive and pressure sensitive copying machines that are capable of full-color copying have appeared, an example of which is shown in FIG. That is, the photosensitive and pressure sensitive copying machine 1 uses photosensitive paper consisting of light and pressure sensitive paper (microcapsule paper) and developer paper.
A movable original platen glass 2 and an original platen cup 3 are provided on the top plate portion of the copying machine 1, and a desired original 4 is set face down on the original platen glass 2.

A light source using an I\halogen lamp 5 or the like is installed at the top of the copying machine 1, and a line-shaped light is irradiated through a slit hole provided on the top surface of the machine toward the document table glass 2. The emitted light is transmitted through the transparent platen glass 2.
and is reflected by the document 4 placed on top of it. Therefore, exposure scanning of the original 4 is performed by moving the original platen glass 2. The light reflected from the original 4 passes through a filter 6 for adjusting the color tone of the copied image and enters a projection lens 7, and the light projected by this lens 7 is directed to a pair of reflecting mirrors 8.9. The image is then imaged on the microcapsule paper 11 located along the exposure table 10. The reflecting mirrors 8 and 9 are mounted on a mirror mounting plate, and the optical path length and focus are adjusted by finely adjusting the mounting position of the mirror mounting plate.

On the other hand, a long microcapsule paper 11 is wound around a cartridge shaft 12 and housed in a removable cartridge, and one end of the paper is wrapped around a cartridge shaft 12.
4a, 14b, 14c, pressure developing device 13, and separation mechanism 1
4d, it reaches the winder 15. That is, the microcapsule paper 11 coming out from the lower part of the cartridge is guided by the feed roller 14a5 and the guide roller 14b, passes below the exposure table 10, and then is supplied to the pressure developing device 13.
Further, the microcapsule paper 11 that has passed through the pressure developing device 13 is guided to the feed roller 14C1, the separation mechanism 14d, and the meandering adjustment roller 14e, and is then wound onto the winding belt 15. Note that the unexposed microcapsule paper 11 after leaving the cartridge is maintained in an unexposed state by the light shielding cover. Furthermore, the conveyance speed of the microcapsule paper 11 is controlled to be constant and is made to match the moving speed of the document platen glass 2, so that the microcapsule paper 11 has a predetermined amount of the document when passing through the exposure table 10. Lines of latent images are sequentially formed.

A paper feed cassette 17 containing developer paper (recording paper) 16 constituting the paper feed device is installed below the pressure phenomenon device 13, and a suction cup type feeder that feeds paper using negative pressure suction is installed. A paper mechanism 18 is provided, and the developer paper 16 is taken out one by one by the paper feed mechanism 18, conveyed by a feed roller 19a and a pinch roller 19b, and transferred to a developer paper roller 19C.
After the leading end is aligned by the resist gate 119d and the resist gate 19e, it is carried into the pressure developing device 13. Thus, the microcapsule paper 11 is placed in the pressure developing device 13.
and the color developer paper 16 are supplied in a tightly packed and integrated state, and the microcapsule surface of the microcapsule paper 11 on which the latent image is formed and the color developer coated surface of the color developer paper 16 are in contact with each other on the inside. The roller 13a is then sandwiched between the small diameter roller 13a and the backup roller i3b, and pressure is applied thereto.

This pressure destroys the unexposed microcapsules and forms an image on the color developing paper 16.

After the microcapsule paper 11 and the color developer paper 16 produced by the pressure developing device 13 are separated by a separation mechanism 14d, the color development of the color developer paper 16 is promoted by the heat roller 20a of the heat fixing device 20 to form an image. After that, the paper is delivered to a paper ejection tray 21 by a paper ejection roller. Note that the separated microcapsule paper 11 is wound onto the winding shaft 15 via the meandering adjustment roller 14e.

[Problem to be solved by the invention]

In the suction cup type paper feeding mechanism 18, the developing paper 16 is sent out one by one to the reeling roller 19a1 and the pinch roller 19b by the swinging motion of the paper feeding mechanism 18.
When the amount of developing paper decreases, the total amount decreases. If the main power of the copying machine is turned off while the paper feed mechanism 18 is operating, the paper feed mechanism 18 will stop at that point, and if the paper feed cassette 17 is pulled out in this state, the paper feed cassette 17
There was a problem in that the peripheral wall of the cassette collided with the paper feeding mechanism 18 and the paper feeding cassette could not be pulled out.

In view of this, the present invention provides an image forming apparatus having a control means for the paper feeding mechanism that allows the paper feeding cassette to be taken out at any time even if the main power is turned off while the paper feeding mechanism is in operation. The purpose is to provide.

[Means to solve the problem]

Therefore, the present invention provides an image forming apparatus using a photosensitive recording medium that includes a main power switch, an auxiliary power source, and a paper feeder that feeds the top layer of developing paper one by one of sheet media stacked in a cassette. and a control means for operating the standby means by the auxiliary power source so as to raise the paper feeding means when the main power switch is turned off.

[Effect]

When a main power source is turned off during operation of a paper feeding mechanism, an auxiliary power source is turned on, and the auxiliary power source returns the paper feeding mechanism to an initial position. This prevents the paper feed cassette from colliding with the paper feed mechanism and being unable to be pulled out when the paper feed cassette is pulled out.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

First, the suction cup type paper feeding mechanism S will be explained.

The paper feeding mechanism S has a suction cup unit U as shown in FIG. It is attached to a freely movable elevator arm (hereinafter referred to as a rotating arm) 32 via a mounting plate 32a, and the rotating arm 32 is attached to an elevator frame ( (hereinafter referred to as frame)
It is rotatably supported by 36. The rotation axis 34, which is the center of rotation of the suction fi 31, has its center on an extension line of the suction surface of the suction cup 31, and is located further in the paper conveyance direction than the part where the suction cup 31 attracts the developing paper 16. It is located at the rear.

Note that the suction cup 31 is arranged so as to attract the color developer paper 16 at a relatively front portion relative to the front and back of the color developer paper 16 in the conveying direction. Also, the mounting on the rotating arm 32 is
A paper uppermost surface detection sensor 33 made of a microswitch or the like is attached via an attachment plate 32b that branches off at a predetermined angle from the uppermost surface of the paper. Here, when the mounting tM32b is located in the vertical direction, the sensor 33 and the rotation shaft 34 are in a relationship such that they are located on the same horizontal plane.

A motor 37 is attached to the frame 36, and the gear 3 is driven by the rotation of the motor 37.
8 is pivotally supported, and this gear 38 meshes with three swing gears fixed to the rotation shaft 34, and the rotation of the motor 37 rotates the rotation arm 32 in the directions of arrows A and B. It is now possible to move it.

The frame 36 is supported by a guide mechanism (not shown), and is movable up and down in the direction of arrow CD using a step motor 40 attached to the main body side plate 35 as a driving source. As the mechanism, shafts 41 and 42 supported by the main body side plate 35 are connected to elongated holes 4 formed in the frame 36.
A gear 45° 46 passing through the shaft 41.44 and fixed to the shaft 41.42 meshes with a rack 47.48 formed at the edge of the elongated hole 43.44. Further, pulleys 49, 50 are fixed to each shaft end, and these pulleys 49.5
A timing belt 51 is placed between the steps of the step motor 40 and a helical gear 52 fixed to the end of the shaft 41.
A worm gear 53 fixed to the output shaft is in mesh with the output shaft.

The suction cup 31 is connected to a pressure reducing means (not shown) via a tube 54 made of a flexible material.

Now, the frame 36 is at a predetermined home position, and the step motor 40 is activated based on the paper feed signal from the copying II.
When driven, the movement is transmitted to the shaft 41 via the worm 53 and the hub gear 52, and when the gear 45 is rotated clockwise in FIG. Gear 4 of shaft 42
6 is also rotated in the same direction, and by the engagement of these gears 45, 46 and racks 47, 48, the frame 36 is lowered in the direction of the arrow. Rotating arm 3 integrated with this frame 36
2 also descends at the same time. Note that during this descent, the arm 32
As shown in FIG. 2a, the mounting plate 32b is in a vertical position so that the sensor 33 can detect the uppermost surface of the paper first.

When the sensor 33 detects the uppermost surface of the paper, the rotation of the step motor 40 is stopped, and the lowering of the frame 36 is stopped. Next, the step motor 37 is driven, its rotation is transmitted to the gear 38 and the swing gear 39, and the rotation shaft 34 is rotated, thereby rotating the rotation arm 32 in the direction of arrow B.

Then, since the suction cup 31 and the rotating shaft 34 are located on the same plane, the suction cup 31 is in a state where it can be sucked against the topmost color developing paper 16, as shown in FIG. 2b.

Next, the pressure reducing means is driven to suck the uppermost and lowest color developing paper 16 with the suction cup 31, and the feed roller 1 is moved by the swinging motion.
The leading end of the paper is sandwiched between the pinch roller 9a and the pinch roller 19b, and the paper is fed.

Through the above series of operations, only one sheet of color developing paper 16 is separated and supplied into the conveyance path.

The suction cup type paper feeding mechanism S having such a structure is controlled by a control circuit C as shown in FIG.
is the paper feeder Ii! ! s, and a command signal from the CPU 51 is input to the control section 50. A main 11i source switch 52 is connected to the AC power supply 57, a transformer 53 is provided in this power supply circuit, the current from the power supply circuit is manually supplied to the CPU 51 via a zero cross comparator 57, and a rectifier 55 is further connected to the control circuit C. The rectifier 55 converts alternating current into direct current, and this direct current charges a battery backup circuit 56 as an auxiliary power source and is supplied to the control unit and the like.

Further, the two motors 37 and 40 in FIG. 1 are each provided with encoders 39a and 40a, so that the rotational position of each motor is counted by the number of pulses.

Next, the effect will be explained.

Now, turn off the main power switch 52 while the paper feed mechanism S is operating.
, the main power supply 57 stops supplying current to the control circuit C. However, each member continues to be in operation due to the electric power charged by the auxiliary power source. The OFF state of the main power switch 52 is detected by the zero cross comparator 57, and the CPU 51
2 is detected, the controller 50 is commanded to operate the standby means and the sheet feeding mechanism S using the battery backup circuit 56 as an auxiliary power source. The CPU 51 operates a motor 39 that operates the paper feeding mechanism S.
, 40 encoders 39a.

The current position of the suction cup unit U is detected by the encoder signal from the encoder 40a, and a command is given to each motor 39, 40 of the control section 50 to return the sheet feeding mechanism to the initial position. In this way, the suction cup unit i. will always return to the initial position raised when the main power is cut off.

〔Effect of the invention〕

Since the present invention is configured as described above, whenever the main power is cut off, the paper feed mechanism returns to the raised position, and the paper feed cassette for developer paper can be pulled out, and the paper feed cassette and suction cup Collisions with units are avoided.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a suction cup type paper feeding mechanism, Fig. 2a. 2b is an explanatory diagram of the operation of the suction cup unit, FIG. 3 is a diagonal control circuit diagram of the paper feeding mechanism, and FIG. 4 is a configuration diagram of a conventional image forming apparatus. 31...Sucker, 39.40...Motor, 39a. 40a... Encoder, 50... Control unit, 51...
・CPU, 52... Main power switch, 55... Rectifier, 56... Battery backup circuit, 57...
Zero cross comparator. Applicant's agent Yasushi Ishikawa Ocha 4 Zushin City official document Date of 1989

Claims (1)

[Claims] In an image forming apparatus using a photosensitive recording medium, a main power switch, an auxiliary power supply, a paper feeding means for feeding one sheet at a time the top layer of color developing paper of sheet media stacked in a cassette, and the main An image forming apparatus comprising: a control means for operating a standby means by the auxiliary power source so as to raise the paper feeding means when a power switch is turned off.