JPS62191338A - Feeder - Google Patents

Abstract

PURPOSE:To secure such a feeder that is simple in constitution and easy in control, by controlling contact and separation motion between the feeder and a sheet material at an uppermost surface with a spring clutch device. CONSTITUTION:In this clutch spring 65, one end is hitched on a stop ring 66 and the other end on a clutch drum 64, respectively, and with repetition of clutch operations, a relative relationship between projections 661 and 662 of the stop ring 66 and a cam 59 is designed so as to be shifted. Eventually, a suction release state of a solenoid 67 always corresponds to the projection 661 while a suction state always corresponds to the projection 662 so that a rotation start reference position of the cam 59 is easily settable by what the solenoid 67 comes off. Thus, if the cam 59 is made so as to be temporarily stopped in the midway, the time being pressed down is controllable by suction time of the solenoid 67 so that it is useful as the degree of freedom in a design is increased.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a spring clutch device that controls on/off of drive.

Various types of spring clutches have been used in the past, but normally, the control lever is actuated on a stop member from a direction perpendicular to the shaft to control the engagement and engagement of the spring clutch. This has the disadvantage that unless the lever member reciprocates at high speed, the drive cannot be accurately interrupted or interrupted at a predetermined rotational position.

In other words, in the conventionally known system, the control lever member is once retracted to a position where the stop member is released (off state) to connect the clutch, and then in order to disengage the clutch at a predetermined rotational position, the control lever member must be must be returned to the locking position (on state) of the stop member.

Therefore, the control lever must be reciprocated at high speed in accordance with the rotation of the stop member (rotation of the rotational drive source).
High precision control of the control lever member is required.

Further, for example, if the control lever member is stopped in the OFF state, there is a risk that the driving of the spring clutch device will not be cut off and the interlocked state will be maintained.

Furthermore, with the conventionally known clutch device as described above, the stop member can be engaged and disengaged by the control lever member at any rotational position of the stop member. Inconveniences may occur in that the position is not constant. In other words, for example, in a clutch device in which two protrusions (180 degrees out of phase in the rotational direction) are provided on the outer periphery of the stop member, when the control lever member is turned on, both protrusions engage. This is because the stopping position (starting position of the next rotation) of the stop member differs depending on the protrusion to be engaged.

The present invention has been made in view of the above-mentioned drawbacks of the conventional example, and provides a feeding device having a spring clutch that has a simple configuration, is easy to control, and can also easily control the rotational position. It is something. By using the configuration of the present invention, it is possible to solve the problem pointed out earlier, that is, the drive of the feeding device remains connected and a number of sheets are fed unnecessarily.

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

A document 1 is placed on a document glass 2 that constitutes a document placement surface on the top surface of the machine case. Illumination lamp 3, first mirror 4 that moves together with it; 1/2 of this first mirror 4
a second mirror moving in the same direction with a moving speed of 5.
Slit exposure is performed by an optical system consisting of a switching mirror 6, a lens 7, and a fixed mirror 8, and the image is formed onto a drum 9.

The surface of the drum 9 is a photosensitive surface, and is charged by a charger 10. Subsequently, when reaching the exposure section 11, the photoreceptor is exposed to the original image and at the same time is subjected to static elimination by the static eliminator 12.

Next, an electrostatic latent image is formed on the drum surface (photoreceptor) by being exposed to light from the front exposure lamp 13, and then transferred to the developing device 14.
Enter.

Development is performed by a developing roller 15. Thereafter, the post charger 16 squeezes out the excess developer.

Next, the image on the drum 9 is transferred by the transfer charger 17 onto a plurality of sheets of paper 20 sent out from the feeding section 18 or 19. After the copy paper has been transferred, it is separated from the drum 9 by a separating section 21, guided to a fixing section 22, fixed thereon, and then discharged onto a tray 24 by a discharge roller 23. On the other hand, the remaining toner on the drum is cleaned by a blade 25 pressed against the drum surface (photosensitive surface), and the next cycle can be repeated again.

When copying a thick original, the switching mirror 6 is in the state shown by the two-dot chain line. By moving the switching mirror 6 to the solid line position and moving the movable mirror 4.5 to the right end (solid line position), the automatic sheet document feeding device 26 can be employed.

In this case, the original passing through the exposure section 30 is illuminated by the lamp 3, and its image is formed on the drum 9 by the switching mirror 6, the lens 7, and the fixed mirror 8. This lamp 3 is the same lamp used for thick originals (described later). Sheet original 2 stacked on the original loading table 27 of the sheet original automatic feeder 26
The uppermost sheet of document No. 8 is separated by a separation roller 29, and conveyed to the document tray 3S by a series of feed rollers 31, 32, 33, and 34 through the exposure section 30, and then ejected.

In Figures 1 and 2, Figure 1 shows the main cassette 7.
3 or the sub cassette 74 is used. By switching the button, it is possible to select which of the upper and lower paper feed rollers 53 will act.

FIG. 2 shows a state in which a manual cassette 75 is used.

The cassette receiver 77 is fixed to the main body! It is pivoted to i[h79. The manual cassette 75 is slidably attached to a cassette receiver 77, and one end of the manual cassette 75 is fixed to a shaft 79 which is rotatably supported on the main body by the link 7. The shaft 79 is oscillated by a motor,
The position can be selected by switching the button.

In addition, as shown in Figure 2, a paper detection element (lamp, light receiving element) is placed in the copy paper path corresponding to the distance @X between the transfer position and the exposure position.
I'm here. The optical system is then reversed by the trailing edge of the paper. Control will be described later.

The details of the absorbent portion will be explained with reference to Figures 3.4 and 5.6. The paper feed roller 53 is fixed to its shaft 54, and the shaft is supported by an arm 55.

A rotation shaft 56 is fixed to this arm 55, and this shaft 56
is pivoted on the main body frame. Therefore, the paper feed roller 5
3 can swing around an axis 56. A spring 57 is applied to the arm 55 and pulled upward. A follower roller 58 is provided on the shaft 54 and operates as a follower of the cam 59. The cam 59 is controlled by a one-turn clutch that temporarily stops the rotation. This is explained in Figure 5.6. The cam shaft 60 passes through a frame 61 and is pivotally supported by this. The input to this camshaft is input from the motor to the pulley 63 via the belt 62.

Bay portion 63 of pulley 63. and a clutch drum 64. fixed to the shaft 6o. Clutch spring 65° Stop ring 66
The spring clutch consisting of is controlled by a solenoid 67. When the solenoid 67 is not suctioning, the lever 68 is located at the position shown by the solid line in FIG.
One of the protrusions 66 is engaged with a lever 68, thereby disengaging the clutch. solenoid 6
7 is attracted, the lever 68 comes to the position 68' shown by the dashed line, and the engagement with the projection 66□ is disengaged, the clutch is engaged and the cam 59 is rotated. However, when the clutch rotates approximately 180 degrees, another protrusion 66□ engages with the lever 68', and the clutch is disengaged again. At this time, the paper feed roller 5
3 is pushed down by this cam 59 and is at the position indicated by the dashed dot line 53' in FIG.

In this pressed down state, the paper feed roller shaft 54
A friction pulley 69 (Fig. 4) fixed to one end of the
The paper feed roller 53 is driven by contact with the paper feed roller 53 (FIG.).

When the suction of the solenoid 67 is released, the protrusion 662 and the lever 68' are disengaged and the clutch is engaged again at 180.
After rotating by about 1°, it returns to the state shown in Fig. 5.
The clutch becomes disconnected. The clutch spring 65 is hooked at one end to the stop ring 66 and at the other end to the clutch drum 64 to prevent the relative relationship between the protrusions 66□, 662 of the stop ring 66 and the cam 59 from shifting due to repeated clutch operations. .

In other words, the suction release state of Raynoid 67 (signal is off)
always corresponds to the protrusion 66, and the suction state of the solenoid 67 (signal is on) always corresponds to the protrusion 662, so the rotation start reference position of the cam 59 can be easily set by turning the solenoid 67 off.

If the cam 59 is temporarily stopped in the middle in this way, the time during which the cam 59 is pressed down can be controlled by the suction time of the solenoid 67, which is useful because it increases the degree of freedom in design. A conventional example of the cam control method that causes this temporary stop is described in the seventh section.
As shown in the figure. In Fig. 7, 66 is a stop ring;
1°662 is a concave portion for hooking the stop ring to stop it, and levers (b) and (c) are for hooking the respective concave portions and rotate around the axis (d).

A lever (a) with a dowel (a') is also rotated by a solenoid 67 about an axis (d), and two levers (b).

(C). Although a detailed explanation of the operation will be omitted, the present invention is clearly simpler than this method, and therefore has higher reliability and lower cost. In the conventional case, the balance of the two springs and the accuracy (tolerance) of some parts overlap,
The complicated movement of the parts relative to each other results in low reliability and high cost.

The paper that is ejected from the cassette is in the ejecting direction.

Due to the stiffness of the paper, its own weight, etc., it is fed as shown by the two-dot head line P in Figure 2, but it is hit by a register roller 52 (stopped at this time) to ensure accurate timing with the machine, and the After forming a loop like this, the register roller 52 starts rotating and sends out the next one.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a copying machine to which the present invention is applied, Fig. 2 is a sectional view showing manual paper feeding, Fig. 3 is a sectional view showing details of the paper feeding section, and Fig. 4 is a sectional view of the copying machine. 5 is a perspective view showing a sheet feeding timing control mechanism, FIG. 6 is a sectional view thereof, and FIG. 7 is a sectional view showing a conventional sheet feeding control mechanism. 3 is an illumination lamp, 4 is a first mirror, 5 is a second mirror, 7
is the lens, 18 is the feeding section (top), 19 is the feeding section (bottom),
Reference numeral 27 indicates a transfer document (sheet document) loading table, 36, 44 a support member, 59 a cam plate, 64 a clutch drum, 65 a clutch spring, 66 a stop ring, 66, . 66,
is a protrusion, and 71.72 is a guide plate.

Claims (1)

[Scope of Claims] A clutch spring engaged with a driving side clutch body and a driven side clutch body, a stop member that controls tightening of the clutch spring, and a stop member that controls tightening of the clutch spring, and a projections that are provided at different positions in the circumferential direction; and a lever member that is movable in the direction of the rotation axis and selectively displaces to positions corresponding to the projections to engage and disengage the clutch, thereby engaging and disengaging the clutch; and a spring clutch means having the above-mentioned spring clutch means, and the spring clutch means is used to control the contact/separation operation between the uppermost sheet material and the feeding means for feeding the loaded sheet materials one by one. feeding device.