JPS60118552A - Paper feeder of copying machine - Google Patents

Abstract

PURPOSE:To prevent winkling, etc. and miniaturize a unit by releasing the delivering action of a delivery roller by means of a cam, which rotates synchronized with the rotation of an upper roller. CONSTITUTION:When the end of a seet of original paper B reached te interposingly holding part of a timing roller 14, and as a first posture X, in which a gap is formed between the upper and a lower roller 9, 10 to pass through the original paper, is produced, a delivery roller 8 is changed from a first state D to a second state E. While the upper roller 9 rotates till the second posture 9 is produced, a cam 28 also rotates synchronized with the rotation of the upper roller 9. The configurations of the cam 28 and a cam follower 29 are set in such a way that the cam face of the cam 28 is always in contact with the cam follower 29 so as to maintain the second state E of the delivery roller 8.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for rotating a document feed roller, an upper edge roller, and a lower roller alternately on a pair of upper and lower shafts that rotate in the same direction from the upstream side to the downstream side in the paper feeding direction. A pair of timing rollers are arranged at the bottom of the transport roller, and the distance between the upper and lower axes of the transport roller is set to be slightly smaller than the sum of the radii of the upper roller and the lower roller. The present invention relates to an improved technique for a paper feeding device of a copying machine.

The form of paper feeding by the paper feeding device having the above configuration is generally as follows.

That is, by operating the start switch, the feed roller and the transport roller are rotationally driven, and the document, etc. (hereinafter referred to as
For convenience, this is referred to as a manuscript. ) is sent to a conveyance roller by a feed roller, and then the document is rotated in the same direction by a pair of upper and lower surfaces arranged alternately with part of the circumferential surface overlapping in the axial direction to prevent multiple feeding. A single document is surely conveyed toward the timing roller while being held in a wave-like manner in the width direction by the conveyance rollers, and the leading edge of the document reaches the gripping part of the timing roller 1) No. 11. The feed roller and the conveyance roller stop driving at the time when the document is loaded, or a little later than that, and the timing roller is driven at a predetermined timing to convey the document toward the downstream side as if pulling it in. .

However, the timing roller conveys the document which is being held in a rippled manner by a pair of upper and lower conveyance rollers which are being pressed by the feed roller and whose driving is stopped. For the sake of
When the document passes between the upper and lower rollers, it has the disadvantage that it causes undulations, wrinkles, and sometimes tears in the original document.

Generally speaking, the delivery roller is equipped with a one-way clutch in order to enable the timing roller to feed the document when the delivery roller is stopped, but even so, the core roller is not pressed against the document. Therefore, although it is small, it still causes conveyance resistance, but it also tends to increase costs due to the one-way clutch.

One of the means for solving this problem is to separate the feed roller from the original document and to separate the upper and lower transport rollers relative to each other so that the feed roller presses against the original document when the timing roller feeds the document. ,
A system has been proposed that releases the document from the upper and lower transport rollers, but this requires a complicated mechanism and a special drive device (for example, a solenoid), which not only increases costs but also reduces paper feeding. This has the drawback of causing congestion in the apparatus and, by extension, increasing the size of the copying machine itself.

The present invention has been made in view of the above circumstances, and
This is an extremely simple improvement that takes advantage of the structural advantages of pressing the original by the feed roller and releasing the gripping of the original by the upper and lower rollers, but does not solve the above conventional drawbacks. can be,
According to the paper feeding device of the copying machine according to the present invention, there is provided a gap between the circumferential surface of the upper roller and the circumferential surface of the -F roller when viewed in the axial direction. The feed roller is provided with a cutout portion that forms an upper roller, and the feed roller is provided so as to be freely switchable between a first state in which it feeds out the document, etc. and a second state in which the feed action is released in which it separates from the document, etc.; The feature is that 1) the second state of IJ is made to appear when the clear gap of the original document etc. appears by means of the synchronously rotating cams (i4).

(Margin below, continued on next page.) An embodiment of the present invention will be described below based on the present invention. .

FIG. 1 shows the main parts of an electrostatographic copying machine with a moving optical system in which the present invention is applied to a document feeder (?f).

A document table 2 is provided on the top surface of the copying machine l, and a document B transferred into the document table 2 by a paper feeder A, which will be described later, is
(It is further conveyed by the general conveyance belt 3, its tip is stopped by the stopper 4, and when it stops at a predetermined position on the contact glass 5, the optical system 6 (not shown in the figure) is driven by a drive device (not shown). , only the lamp 6a and the reflector 6b are shown) are moved in parallel from the left position (indicated by a solid line) to the right position (indicated by a phantom line) i to expose the original B, and this is completed. Then, the document B is released from the stopper 4 and is again transferred to the document takeout lower by the conveyor belt 3, while the next document is similarly sent to the document table 2. has been done.

As shown in FIG.
The feed roller 8 is provided on the upstream side of the feed roller 8, and the upper roller 9 is provided downstream g1 of the feed roller 8.
and the lower roller 10;
It consists of a timing roller 14 consisting of a driving roller 2 and a driven roller 13 provided on the downstream side of the general feed roller 11, and each of these rollers performs close timing adjustment with the conveyor belt 3, stopper 4, optical system 6, etc. The details of this will be described later.

Note that 15 is an upper guide plate, and 16 is a lower guide plate, which are provided on the document B conveyance path.

FIG. 3 shows the handling of the feed roller 8 and the conveyance roller 11. The upper roller 9 and the lower roller lO that constitute the conveyance roller 11 are both made of rubber material. Reference numeral 9 is made of natural rubber with low frictional resistance, and row 21.0 is made of urethane rubber with low frictional resistance, and they are respectively provided on shafts 18 and 19 that rotate in the same direction. As shown in FIGS. 4 and 5, the upper opening 29 and the lower roller 1O are arranged alternately (staggered), and the dimension t between the axes of the rollers 18 and 19 is the radius of the upper roller 9. If r9 is the radius of the roller 10, and rlo is the radius of the roller 10, then t< r9+ "10, and depending on the installation spacing between the upper roller 9 and the lower roller 10 on the axis, r,
+r and o- are set to approximately 0.3 to 0.8 gates in the evening.

For this reason, the document B passing between the upper roller 9 and the lower roller 10 usually rolls along the curve in a slightly undulating manner as shown in FIG. The paper is sent to the downstream side under the conveyance force caused by the difference in the

Incidentally, it is also possible to convey the document (3) with a difference in the circumferential speed of the upper roller 9 and the lower roller 10, that is, both ends -29,
100 material and circumferential speed are not important.

As shown in FIGS. 5 and 6, a concavely curved cutout portion 9a is formed on the circumferential surface of the upper roller 9 around the center of the rotation of the lower row 210 when both rows 9 + 10 are set. In addition, the cut portion 9a forms a passage gap 17 for the original B between it and the circumferential surface of the lower roller when viewed in the axial direction. The cutout portion 9a is formed to such an extent that almost no force from the upper and lower rollers 9, 10 is applied.

The upper roller 9 is attached to the shaft 18 by i? , I + Two arms 20 , 20 are spaced apart at a predetermined distance in the core direction, and their free ends are pivoted toward the upstream 11 (Vl) in the sheet feeding direction, and these arms 20 , 2 ( 141t ('J
They are being kicked out.

A transmission mechanism 22 such as a toothed belt is provided between the shaft 21 and the upper roller II'llll 18.

The feed roller 8 is synchronized with the upper roller 9 and rotates tla1 in the same direction. A weight W is provided across the free ends of both arms 20 and 2 (+), and the gravity due to the weight W etc. Some body presses the feed roller 8 against the original 7 (11) and sends out the original B in this state.

Then, by the number of cams 1 and 71i
．． eye).

As shown in Figure 11, the first form fib
The feed-out row 28 in position D can be switched to a second state E in which the feed-out action is released, in which the feed-out row 28 is separated from the document B.

Figure 3 and 7.81i4 show the specific structure of Den 1iii Isogaki C. In the figure, G1 is the input gear, (r2 + G
Reference numeral 5 indicates a counter gear loosely fitted to the counter shaft arm; reference numeral G3 indicates a gear provided on the upper roller shaft 18;
occlusion.

( ) is a transmission gear provided on the upper roller shaft 18, and G6 is a transmission gear provided on the lower roller shaft 19, both of which mesh with the counter gear G5.

Incidentally, when the transmission gear G4+G6← is in the engaged state of the feed clutch U, the shafts 18 and 19 rotate in synchronization in the same direction.

As shown in FIGS. 12 to 15, the feed clutch 24 includes two for switching the clutch 24 to the disengaged state.
A locking piece 25 is provided with clutch pawls a and b, and is selectively engaged with the clutch pawls a and b.
When the K solenoid 26 is connected and the solenoid 26 is in a de-energized state, as shown in FIGS.
and by energizing the solenoid 26, the fourteenth
As shown in FIG. 15, the locking piece 25 is cut back to a position where it locks one of the clutch pawls.

Then, in the transmission release state where the locking piece 25 is locked to the clutch pawl, as shown in FIGS. 5, 6 and 11,
The cutout portion 9a of the upper roller 9 rotates so as to face the circumferential surface of the lower roller 10 when viewed in the Ill core direction, and both rollers 9,
t<9 so that the first posture X that forms the original passage gap 17 is created between 10 and 10.

On the other hand, the locking piece 25 is locked to the clutch pawl a (
When the IJ is released, the upper opening 29 forms the original passage gap 7, so it rotates slightly in the paper feeding direction, as shown in FIGS. 2, 3, and 9. , both rollers 9
, 100 circumferences overlap in the axial direction.

Note that, as shown in FIGS. 9 and 1 (1 and 11), due to the rotation of the upper roller 9 while switching from the second posture Y to the first posture Now, as shown in FIG. 3, the RtJ upper roller shaft 1
A transmission gear (
J71G, and both gears G7. A counter gear G8 is engaged with the camshaft 2.
7 is provided with two cams 28, 28. And a cam follower 29 for the cams 28, 28,
29 is connected to the arms 20, 20, and
The arms 20 and 20 are made to swing in synchronization with the rotation of the arm 29.

Specifically, the leading edge of the document B is connected to the timing roller 14.
When the feed roller 8 reaches the nipping portion and the first posture X that forms the document passage gap 7 between the upper and lower rollers 9° and 10 is reached (see FIG. 11), the feed roller 8 is moved to the first state. 1) to the second state E, and until the upper roller 9 rotates and the second posture Y shown in FIG. In other words, the rotation of the upper roller 9 until the second posture Y appears corresponds to the phase angle of the clutches a and b ← f during this period. The cam 28 also rotates in synchronization with the rotation of the upper roller 9, but despite this rotation, the cam surface of the ffta cam 28 is always in contact with the cam follower 29, and the second position of the feed roller 8! Cam 2 to maintain sweet E
8 and the shape of the cam follower 29 are set.

Next, the operation of the paper feeder A having the above configuration will be explained without reference to FIG. 3 and FIGS. 9 to 15.

First, with the document +3 set on the document table 30, the start switch is turned on and the input gear G is rotated. In this dog, No. 19, the feed clutch 24 is in the disengaged state, so only the gears (Jl + (J2 + G3) are rotating.

Next, when the paper feed switch is turned on, the solenoid 26 is energized and the locking piece 25 is released from the clutch pawl a, and the upper roller' lYI+ 18 rotates, and accordingly, the shaft 19 rotates through the gears G, , u, , 011), that is, the upper roller 9 changes from the second position Y to the first position X. At the same time, the feed roller 8 and the cover roller 10 also rotate in synchronization with this.

At the same time, the cam 27 also rotates synchronously, the cam 280 is released from contact with the cam follower 29, and the feed low 28, which is in the second state E, is switched to the first state.

Therefore, the uppermost document B is sent downstream by the feed row 28, and then receives the conveyance force from the conveyance roller 11, so that the leading edge of the document B is transferred to the timing roller 1.
It will be fed up to the holding part No. 4.

At the same time as the tip of the original g4B reaches the clamping part of the timing roller 14, or a little later, the clutch pawl comes into contact with the locking piece 25, and the upper roller 9 becomes Hz, 1 posture X, and moves up and down. Original passage gap between rollers 9 and 10■
7, and the feed roller 8 changes from the first state gD to the second state! by the action of the cam 28! Furthermore, when the document B is fed out by the feeding roller 28, the second document B may also be fed out at the same time. is not affected by the conveying action of the upper roller 9 at all, and due to the combination of its tip contacting the lower roller 10 rotating in the return direction, it does not advance further to t, and the two-sheet feed of the original CAB is delayed. It is something that is prevented.

Now, after the leading edge 1° 14 of the original 13 reaches the nipping portion of the timing roller] 4, the front d12 timing row 214 is driven at a predetermined timing time, and the front 11th original B is moved to the upper and lower rows 29, As mentioned above, the feed roller 8 is in the second state E, and the feed roller 8 is in the second state E.
In addition, since a gap 17 is formed between the upper and lower rollers 9 and 10 of the conveying roller 11 to allow the original paper 16 to pass by the cutout portion 9a, the timing roller 14 can feed the paper lightly and smoothly.

This makes it possible to prevent the document 13 from becoming wavy or wrinkled, as well as from being torn, as in the conventional case.

Next, when the paper feeding process by the timing roller 14 is completed, the solenoid 26 is turned off and the locking piece 25 is moved to the clutch pawl. , +h is canceled.

The upper roller 9 rotates until the clutch pawl a on the A10 side comes into contact with the locking piece 25, and the original second posture Y is revealed.

Incidentally, the cam 28 also rotates in synchronization with the upper roller 9, but since the contact length of the cam surface with the cam follower 29 (cam action length) is long, the feed roller 28 maintains the second state E. .

With the above steps, one document feed is completed, and the leading edge of the document B that has entered the document table 2 reaches the stopper 4.
The conveyor belt 3 comes into contact with this, and the conveyor belt 3 stops, and then copying is performed based on the optical system 6. After the copying is completed, the restriction on the tip of the stopper 4 with respect to the document B is released, and the conveyor belt 3 stops. 3, the original B is ejected to the original take-out lower part.

The reason why the upper opening 29 is switched to the second posture Y after the timing roller 14 completes the paper feeding step I is as follows.

That is, when the first position X of the upper roller 9 is set to the standby position for starting paper feeding, as shown in FIG. 16
There is a concern that the stopper part 16a, which is also used as part of the stopper part 16a, may be climbed over and entered between the upper and lower rows 29 and 10.
Alternatively, for example, a stopper that can be switched between an operative state and a non-operative state by a solenoid may be provided separately.
The upper and lower rollers Sl.

To prevent document ■3 from entering the space between 10 and 10! ?
? At this point, in order to switch the upper roller 9 to the second figure Y, the circumferential surfaces of the upper roller 9 and the lower roller 1o should overlap in the axial direction. This prevents the document B from entering between the upper and lower rollers 9 and 10.

In order to visually confirm the set state of the original document 130 from outside the case 31, the case portion 31a has a transparent structure, but the entire case 31 may have a transparent structure.

Also, while the upper roller 9 rotates once, the first
Although the posture X and the second posture Y are made to appear, the upper roller 9 is made to have a large diameter, and for example, two
The cutout part 9a of the cage is provided in a symmetrical state, so that the upper opening -29
It may be configured such that the first attitude X and the second attitude Y are made to appear once each by a half-rotation movement of the original document passing gap 17. Each time, the feed-out row 28 is set to the second state in synchronization with this!
It is important to switch to 4E.

Further, the timing for switching the iMJ upper roller 92 to the Y position may be any time before the next sheet feeding by the feed row 28 is started. In order to switch between the first posture , b are provided on the same circumference, and the solenoid 26
The single-time excitation of ζ may be performed repeatedly, or it may be configured by program control.

Further, as the cutout portion 9a provided in the upper opening-29, a first
As shown in FIGS. 6(a) and 6(b), it may be deformed into a groove-like shape or a dovetail-like shape, and in the case of the dovetail-like structure, the upper roller 9 is in the first posture Since the peripheral surface part C bends just before switching to the paper, the paper pressing force by the corners of the part C becomes weaker, making it difficult to press the paper onto the paper surface.
stomach.

Furthermore, in the embodiment, the paper feeding device A for the J and t1 document slots has been described, but it may also be applied to feeding copy paper.

Historically, in the embodiment, the delivery D-ra 8 is maintained in the second state E between the time when the first attitude X appears and the second attitude)' appears. Only during the appearance of the first posture X in which the document passing gap 17 is formed,
In order to maintain the feed roller 8 in the second state E,
The cam 28 may be formed into a rod shape.

As explained above, the paper feeding device for copying according to the present invention is provided with a cutting portion on the circumferential surface of the transport roller, and the cutting portion is removed during the sheet feeding process to the timing roller. Since a gap is formed between the upper and lower rollers for the document, etc. to pass between the upper and lower rollers, it is possible to prevent the document, etc. from becoming wavy, wrinkled, or torn, unlike conventional methods. Moreover, since only the cutout part is formed on the ten rollers, compared to the case where the upper and lower rollers are separated from each other, etc.
Not only is there no need for a special drive device, but it is also possible to avoid the congestion of paper feed devices and the accompanying increase in the size of the entire copying machine.

Furthermore, a cam that utilizes the rotation of the upper roller is used to simultaneously separate the feed roller from the document, etc. at the same time as creating the passage gap for the document, etc.; Not only is it cheaper than a structure using a solenoid or the like, but it is also extremely easy to synchronize the separation of the rollers with the appearance of the gap.

[Brief explanation of the drawing]

The drawings show an embodiment of the invention, and FIG. 1 shows an example of application 1 of the invention.
．． 2 is a sectional view showing the main parts of the paper feeding device, FIG. 3 is a perspective view of the feed roller and conveyance roller and their transmission mechanisms, and FIG. 4 is the paper feeding state. FIGS. 5 and 6 are partial views of the conveying roller, respectively, and are explanatory diagrams showing the state of formation of the passage gap for documents, etc., respectively. Transmission in Figure 7] Form diagram of substitute lecturer, Figure 8 is 7 in Figure 7, -
0-Z line cutaway U-II, Figures 9, 10, and 11 are explanatory diagrams of paper feeding by the conveyance roller and feed 11th to mouth/-ra, Figures 12 to 15 are explanatory diagrams of the operation of the feed franchise,
FIGS. 16(a) and 16(b) are explanatory diagrams showing other embodiments of the cutout portion provided on the upper l-1-a, respectively. 8...Feeding roller, 9...Upper roller, 9a...
- Excision part, 10... Lower roller, 14... Timing roller, 17... Passage gap for originals, etc., 18119...
・Shaft, 28...Cam, t...Dimension between shafts, r! l+1
゛lO...Radius, ■]...First state, E...Second
situation. Figure 12 Figure 14 Figure 16 (A) 447-

Claims (1)

[Claims] A conveyor roller, which is provided alternately on a lower pair of shafts, which rotates an upper roller and a lower roller in the same direction, sequentially from the upstream side to the downstream side in the paper feeding direction, sends out a document, etc.;
In the paper feeding device of a copying machine, in which a pair of upper and lower timing rollers are arranged, and the inter-axis dimension of the upper and lower axes of the transport roller is set to be slightly smaller than the sum of the radii of the upper and lower rollers, the ten rollers A cutting portion is provided on the circumferential surface of the roller to form a passage gap for the document, etc., between the circumferential surface of the lower roller and the circumferential surface of the lower roller when viewed in the axial direction, and the feed roller is separated from the document, etc. in a first state in which it feeds out the document, etc. A cam rotating in synchronization with the rotation of the upper roller causes the second state to appear when the passage gap for the document, etc. appears. Paper feeding device 0 for a copying machine, characterized in that it is configured to