JPH0494350A - Paper feeding mechanism of recording device - Google Patents

Abstract

PURPOSE:To reduce cost by connection one end of an actuator of a feeding solenoid for feeding clutch, and one end of a sheet stop finger together, in such a way that they can be oscillated, and by synchronizing the turning of the ON/OFF of the feeding solenoid and the rotation control of a feeding roller, with each other. CONSTITUTION:When a claw part 21b of an actuator 21 is engaged with a clutch claw 15'a, the motor power in a driving side is not transmitted to a feeding roller l0', and the feeding roller 10' is remained stopped. When a feeding solenoid 20 is turned ON, the actuator 21 is attracted against a spring 18 in the direction of an arrow C, while the claw part 21b is released from the clutch claw 15'a of the feeding clutch 15', and the feeding roller 10' is rotated, and a recording sheet 11 is fed in the direction of an arrow F. A connection part 23 of the actuator 21 and a sheet stop finger 17 is lowered in the direction E, while a front end claw part 17a of the sheet stop finger 17 is lifted in the direction of an arrow D', and the recording sheet 11 thus fed is put to the claw part 17b and is thus regulated. By the turning OFF of the feeding solenoid 20, the sheet stop finger 17 is actuated in a reverse direction, and the stop condition of the recording sheet 11 is canceled.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a recording paper feeding mechanism for recording apparatuses such as laser printers and copying machines.

(Prior Art) FIG. 6 shows a schematic diagram of the overall configuration of a laser printer as an example of a recording device. The device main body 1 is composed of an earth structure 1a and a military structure 1b, and the earth structure 1a is connected to the military structure 1.
It is attached to b by a shaft 2 so that it can be opened and closed in the direction of arrow A-A'.

A belt-shaped photoreceptor 3 having a substantially isosceles triangular shape is provided at the center of the main body 1 of the apparatus, and rotates in the direction of arrow B.

A charger 4. Developer 5.
Other electrophotographic process units other than the optical writing unit 8, such as a transfer charger 6 and a cleaning unit 7, are arranged.

Then, the paper feed cassette 9 is set on one side of the main body 1,
A recording paper 11 fed from a paper feed roller 10 is fed to a photoreceptor 3 at a timing determined by a pair of registration rollers 12. The recording paper 11 onto which the visible image has been transferred by the electrophotographic process units 4 to 8 is fixed by a fixing device 13, and then fixed to the main body 1.
The paper is ejected to the paper ejection tray 14 located on the other side.

FIG. 7 shows a detailed mechanical example of the paper feed roller 10 and registration roller pair 12 mentioned above. As shown in the figure, the paper feed roller 10 has an electromagnetic clutch 15 coaxially therewith, and rotation of the paper feed roller 10 is controlled by turning on/off the electromagnetic clutch. Then, the recording paper 11 fed by the paper feed roller 10 is moved upward by the solenoid 16 in the direction of the arrow c-c'.
The paper stops at the claw portion 17b of the paper stop finger 17 (+7a is the pivot point) that swings downward, or passes through it, and is fed to the pair of registration rollers 12.

In this case, the solenoid 16 is interlocked with the electromagnetic clutch 15, and normally the paper stop finger 17 is pulled upward by the spring 18 (in the direction of arrow C' force), and the claw portion 17b
to stop the recording paper. When the solenoid j6 is turned on, it is pulled in the direction of arrow C against the spring 18, allowing the recording paper 11 to pass and feeding it along the guide plate 19 to the pair of registration rollers 12.

(Problems to be Solved by the Invention) In the recording paper feeding mechanism described above, a dedicated solenoid 16 for feeding the recording paper was used to operate the paper stop finger 17, which resulted in high cost. Not only that, but it also requires extra installation space.

Further, the recording paper 11 fed by the paper feed roller 15 is temporarily stopped by the paper stop finger 17, and then
Although paper is allowed to pass through, if the paper feed roller 10 attempts to feed the recording paper even during the - time stop, the recording paper 11 will become slack. As a result, there is a difference in the amount of slack depending on the paper type of the recording paper, and there is a variation in the time from when the paper passes through the paper stop finger until it reaches the pair of registration rollers 12, resulting in misalignment between the recording paper and the recorded image. There's a problem.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned drawbacks and to provide a paper feeding mechanism for a recording device that is inexpensive and capable of adjusting the actuation timing of a paper stop finger based on the amount of slack depending on the paper type of the recording paper. shall be.

(Means for Solving the Problems) In order to solve the above problems and achieve the objects, the present invention provides a mechanism for feeding recording paper to an image forming section by a paper feed roller mechanism whose rotation is controlled by a paper feed clutch. One end of the actuator of the paper feed solenoid for the clutch and one end of the paper stop finger are swingably connected, and when the excitation current is turned on to the paper feed solenoid, the paper stops in conjunction with the rotation control of the paper feed roller. It is characterized in that the recording paper is stopped and passed through the image forming section by the claw portion at the other end of the finger.

(Function) In the present invention, the paper feed solenoid that operates the paper feed clutch of the paper feed roller is provided with an interlocking mechanism that operates the paper stop finger, so that the paper feed solenoid also functions as the paper feed solenoid, thereby reducing costs.

In addition, by variably controlling the operation timing of the dual-purpose paper feed solenoid that operates the paper stop finger, the amount of slack depending on the paper type of the recording paper can be controlled, thereby eliminating misalignment between the recording paper and the recorded image. .

(Embodiment) FIG. 1 shows a paper feeding mechanism diagram according to an embodiment of the present invention. In the figure, 10' is a semicircular paper feed roller (see Figure 2)
A paper feed clutch 15' is provided at one end of the shaft 10'a, and the paper feed clutch 15' has a clutch pawl 15'a.

Reference numeral 20 denotes a paper feed solenoid, and an actuator 21 is fixed to the armature of the paper feed solenoid 20 by a connecting portion 22. One end of the actuator 21 is supported by a fulcrum 21a, and a central portion engages with the clutch pawl 158'. Claw part 2
1b, and the other end is integrally fixed to one end of the paper stop finger 17 by a connecting portion 23.

The paper stop finger 17 is configured such that a claw portion 17b at the other end thereof swings upward and downward in the direction of arrow DD' about a pivot point 17C. A stopper 24 regulates the position of the claw portion 17b when the actuator 21 is pulled upward (in the E' force direction) by the spring 18.

Next, the operation will be explained with reference to FIGS. 2 and 3.

The claw portion 21b of the actuator 21 and the clutch claw 15'a
While they are engaged (meshing), power from the drive side is not transmitted to the paper feed roller 10', so the paper feed roller 10' remains stopped.

Now, when the paper feed solenoid 20 is turned on, the actuator 21 is pulled in the direction of arrow C (downward) against the spring 18, and the claw portion 21b is disengaged from the clutch claw 15a' of the paper feed clutch 15'.

As a result, the paper feed roller 10' starts rotating and feeds the recording paper 11 in the direction of arrow F as shown in FIG.

In addition, the actuator 21 and the paper stop finger 1
7 is lowered in the direction of arrow E (downward), the paper stop finger 17 rotates about the rotation fulcrum 17c, and the tip claw part 1 of the paper stop finger 17 rotates.
7b rises in the direction of arrow D' (upward).

A perspective view of the state at this time is shown in FIG. 3. The paper stop finger 17 has a plurality of distal claw portions 17b and is located between the rollers of the pair of registration rollers 12. Further, the tip claw portion 17b of the paper stop finger 17 is attached to the conveying surface 19a of the recording paper.
There are a plurality of holes 19b (only one hole is shown in FIG. 2) from which the tip protrudes, and a tip claw portion 17b protrudes from these holes so as to obstruct the advance of the recording paper 11, as shown in FIG. .

Therefore, the recording paper lJ fed by the paper feed roller 10' hits this claw portion and its leading edge is regulated.

Next, when the paper feed solenoid 20 is turned off, the paper stop finger 17 operates in the opposite direction to that described above, releasing the stoppage of the recording paper 11 and conveying it by the pair of registration rollers 12.

In the above case, under normal conditions, the claw portion 17b of the paper stop finger 17 is downward in the direction of the arrow, and is in the state shown in Fig. 1.
When the recording paper 11 is inserted into the pair of registration rollers, there is no problem.

Therefore, paper can be passed independently from various paper feed ports.

Next, depending on the paper type of the recording paper 11, the paper feed solenoid 20 is turned on.
10 FF A case where the F operation timing is variably controlled will be explained.

When the recording paper 11 is thick, the paper has a strong stiffness, so if a large amount of slack is taken, the pressing force of the recording paper acting on the claws 17b will increase, making it difficult to remove the recording paper from the claws or causing curling. or In addition, it may jump into the pair of registration rollers 12 instantaneously after coming off the claw portion.

Furthermore, when the recording paper is thin, the paper is not stiff, so unless the amount of slack is increased, the amount of biting into the pair of registration rollers 12 is weak, and the time for biting into the pair of registration rollers 12 is delayed.

From the above, when the recording paper is thick, control is performed by either delaying the ○N timing of the paper feed solenoid or advancing the OFF timing.

Furthermore, if the recording paper is thin, the paper feed solenoid is controlled by either advancing the ON timing or delaying the OFF timing. In either case, the ON/OFF timing is fast,
Which one is selected later is determined by the writing timing of the recorded information.

FIG. 4 shows an example of the timing when register alignment of the registration roller pair (2) is performed based on the writing timing (1) of the above-mentioned recorded information on the photoconductor. Therefore, the operation timing T1 or T of the registration roller pair 12 (FIG. 4 (2)) or the paper feed clutch 10' (FIG. 4 (3))
, is made variable to control the amount of slack.

In this embodiment, as shown in FIG. 5, by changing the OFF timing of the paper feed solenoid 20 using a volume ld provided on the operation surface lc side of the main body of the apparatus, the release time of the paper stop finger 17 is changed, and the release time of the paper stop finger 17 is changed. The amount of slack in the recording paper is changed by adjusting the stop time.

(Effects of the Invention) As explained above, the present invention can control the operation of the paper feed clutch and the paper stop finger with one paper feed solenoid, so the number of relative pesoslenoids can be reduced compared to the conventional method.
Can be done at low cost. Further, since the claw portion of the paper stop finger is normally down, paper can be fed from each of the various transport ports independently.

Furthermore, since the amount of slack in the recording paper is controlled by changing the timing of the operation of the paper feed solenoid that operates the paper stop finger, variations in the alignment between the recording paper and the recorded image are reduced.

[Brief explanation of drawings]

Figure 1 is a paper feed mechanism diagram according to an embodiment of the present invention, Figures 2 and 3 are explanatory diagrams of the operation of Figure 1, and Figure 4 is variable control of ON/○FF operation timing of the paper feed solenoid. Fig. 5 is an example of changing the operation timing of the paper feed solenoid, Fig. 6 is a schematic diagram of the overall configuration of a laser printer as an example of a recording device, and Fig. 7 is a diagram showing an example of the timing of each unit when FIG. 7 is a diagram illustrating a detailed mechanism example of a pair of paper rollers and registration rollers. 1... Device body, IC... Operation surface, 1d.
・Volume, 9...Paper cassette, 10'・
... Paper feed roller, 10'a... Axis, 11... Recording paper, 12... Registration roller pair, 15'... Paper feed clutch, 158'... Clutch pawl, 17...
・Paper stop finger 17c...Rotation fulcrum,
17b, 21b...claw portion, 18...spring, 19...guide plate, 20...paper feed solenoid, 21...actuator, 21a...fulcrum. Par 22, 23...connection part,

Claims (2)

[Claims] (1) In a mechanism that feeds recording paper to the image creation unit by a paper feed roller mechanism whose rotation is controlled by a paper feed clutch, one end of the actuator of the paper feed solenoid for the paper feed clutch and one end of the paper stop finger are oscillated. is movably connected to turn ON/OFF the excitation current to the paper feed solenoid.
A paper feeding mechanism of a recording apparatus, characterized in that the recording paper is stopped and passed through an image forming section by a claw portion at the other end of the paper stop finger in conjunction with rotational control of the paper feeding roller. . (2) The paper feed mechanism for a recording apparatus according to claim 1, wherein the ON/OFF timing of the paper feed solenoid is variably controlled depending on the paper type of the recording paper to be fed.