JPS5946373B2 - Copy machine automatic paper feeder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paper feeding device in a diazo copying machine, etc.
In particular, the document conveyance path and the photosensitive paper conveyance path are merged, a stop member is disposed on the exit side of a pair of feed rollers provided on the combined conveyance path, and the document and the photosensitive paper are brought into contact with this stop member. This paper relates to the improvement of a paper feeding device configured to align the leading edges of both sheets of paper, and its purpose is to be able to send the original to the exposure device with the leading edges of the original and photosensitive paper perfectly aligned. Another object of the present invention is to provide a paper feeding device capable of correcting skewed feeding of a document.

The present invention provides an automatic paper feeder for a copying machine that guides an original from an original transport path and photosensitive paper from a photosensitive paper transport path to a combined transport path, and aligns the leading edges of the original and the photosensitive paper in this combined transport path. , a detection means 128 provided in the document conveyance path to detect the conveyance of the document; a document feed roller 130 provided in the document conveyance path; and a detection means 128 provided in the document conveyance path; a pressure contact member 132 for sandwiching and feeding the original between the two; a paper feed roller 74 that contacts the top surface 6a of the stacked photosensitive paper 6 and feeds the photosensitive paper 6 one by one to the photosensitive paper transport path; means 160, 162, 194, 210, 216 for rotating the paper feed roller 74 once in response to the document detection output from the detection means 128; and a stop member 138 provided on the combined conveyance path and having a projection for aligning the leading edge. , a pair of feed rollers 134 and 136 that are provided behind the stop member 138 in the conveyance direction on the converging conveyance path and can be moved toward and away from each other; and a paper feed roller 74.
a cam 190 that rotates integrally with the cam 190; a swing arm 184 having a follower 188 at one end that responds to the cam 190; The length of the photosensitive paper transport path 8 is selected so that the leading edge of the photosensitive paper 6 comes into contact with the front protrusion of the stop member 138 by one rotation of the paper feed roller 74. and the cam 190 is
Follower 188 is activated only while paper feed roller 74 is rotating.
The swinging arm 184 moves the elevating piece 176 so that the feed rollers 134 and 136 move away from each other, whereby the original and the photosensitive paper 6 come into contact with the protrusions and the alignment of the leading edges is completed. After the paper feed roller 74 completes one rotation,
The cam 190 is moved up and down by the swinging arm 184.
6 is displaced so that the feed rollers 134 and 136 approach each other, and at this time, the document and the photosensitive paper whose leading edges have been aligned are fed out over the projections. It is a device.

FIG. 1 is a simplified cross-sectional view of one embodiment of the present invention.
An automatic paper feeder 4 is provided at the front of the body 2 of the diazo copying machine. The automatic paper feeding device 4 includes (a) a photosensitive paper conveying device 1 for conveying photosensitive paper 6 one by one along a photosensitive paper conveying path 8;
0, and (b) transporting the original along the original transport path 12 and merging the photosensitive paper 6 from the photosensitive paper transport path 8 in the merging transport path 14 so that the leading edges of the original and the photosensitive paper accurately match. and a tip alignment device 16. A document insertion opening 22 is defined by a document insertion table 18 that forms the top cover of the photosensitive paper transport device 10 and a cover 20 that covers the leading edge aligning device 16 . The original and the photosensitive paper 6, whose leading edges have been aligned and overlapped in the converging conveyance path 14, are guided by a guide plate 24 and led to a printing device 26.

In the printing device 26 , a printing light source 30 and a reflecting plate 32 are provided in a transparent cylinder 28 , and an endless conveyor belt 34 is stretched around the outer peripheral wall of the transparent cylinder 28 . The original and the photosensitive paper 6 guided by the guide plate 24 are
It is fed while being sandwiched between the light-transmitting cylinder 28 and the conveyor belt 34, and is printed at that time. The original and the printed photosensitive paper are discharged onto a receiving plate 36, and the two are separated manually to supply only the printed photosensitive paper 6 to a developing device (not shown). Note that it is also possible to manually feed the original and the photosensitive paper in a stacked state from above the cover 20 into the insertion slot 38 and supply them to the printing device 26.

FIG. 2 is a plan view showing a state in which the leading edge aligning device 16 and document insertion table 18 of FIG. 1 are removed.

The rear end of the bottom plate 42 of the photosensitive paper container 40 (see FIGS. 1 and 2)
On the right side of the figure), the rear end of a photosensitive paper mounting plate 44 is pivotally supported by a pin 46. The front end of the photosensitive paper loading plate 44 on the upper side in the conveying direction (the left side in FIGS. 1 and 2) can be moved upwardly. Therefore, the photosensitive paper mounting plate 44 can be rotated and tilted using its rear end as a fulcrum. A regulating plate 48 is attached to the bottom plate 42 for aligning the rear ends of the photosensitive paper 6 stacked on the photosensitive paper mounting plate. This regulating plate 48 can be moved within the range of the elongated hole 50 according to the size of the photosensitive paper 6, and can be fixed at any position. The regulation plate 48 is perpendicular to the bottom plate 42 and extends upward from the notch 51 of the photosensitive paper loading plate 44. The bottom plate 42 includes a pawl mounting plate 56 having a pair of restraining pawls 52 and 54, respectively.
58 is mounted so as to be movable and adjustable in the width direction of the photosensitive paper 6 according to the size of the photosensitive paper 6.

Side plates 60 and 6 are provided upright on the claw mounting plates 56 and 58, respectively.
2 aligns the side edges of the stacked photosensitive papers 6. Stopping claw 52
, 54 are top portions 52a, 54 bent toward the photosensitive paper 6.
a, and a rising portion 52 connected to the top portions 52a and 54a.
b, 54b, respectively. Rising portions 52b, 54
b are erected on the claw mounting plates 56 and 58. restraining claw 52,
54 are spaced apart in the width direction of the photosensitive paper 6. A plurality of (four in the figure) L-shaped lift levers 64 that support the photosensitive paper mounting plate 44 so that the front end of the photosensitive paper mounting plate 44 can be raised are arranged so that the front end of the photosensitive paper mounting plate 44 can be raised. direction (i.e. second
They are arranged at intervals in the vertical direction (in the figure). The lift lever 64 can protrude from a notch 66 formed in the bottom plate 42, thereby pushing up the front end of the photosensitive paper loading plate 44. The lift lever 64 is attached to the side walls 68, 7 of the fuselage 2.
It is fixed to a rotation shaft 72 which is rotatably supported at the same time. A plurality of paper feed rollers 74 that come into frictional contact with the uppermost surface 6a of the stacked photosensitive papers 6 near their front ends are connected to the paper feed roller shaft 7.
6 via a one-way clutch, and the paper feed roller shaft 76 is rotatably supported by the side walls 68, 70.

As will be described later, the paper feed roller shaft 76 is driven to rotate by 360 degrees, that is, by one rotation during paper feeding, and as a result, only one sheet of the uppermost photosensitive paper 6 is fed to the photosensitive paper transport path 8. FIG. 3 is a perspective view showing the left side of the automatic paper feeder 4 shown in FIGS. 1 and 2, and FIG. 4 is a partially cutaway sectional view of the left side. A pulley 78 is fixed to the shaft end of a rotation shaft 72 that is integral with the lift lever 64 . A shaft 80 having an axis parallel to the rotation shaft 72 is fixed to the side wall 68 of the body 2 . One end of a movable plate 82 and a pulley 84 are rotatably supported on this shaft 80. A shaft 8 is attached to the other end of the movable plate 82.
6, a pulley 88 is rotatably supported. The document insertion table 18 is fixed to the pin 90 and is attached to one side wall 68.
and the other side wall 70 in the same manner. Therefore, the document insertion table 18 can be opened and closed freely.
The photosensitive paper container 4 is in an open state as shown by the imaginary line in FIG.
0 can be replenished with photosensitive paper 6. An actuating piece 92 formed integrally with the document insertion table 18 has a protrusion 94
has.

This protrusion 94 can come into contact with the side of the movable plate 82 . The protrusion 94 prevents the movable plate 82 from rotating clockwise around the shaft 80 when the document insertion table 18 is closed as shown in FIG. When the document insertion table 18 is opened counterclockwise around the pin 90 in the counterclockwise direction in FIG. 3 as shown by the imaginary line in FIG. allow to do so. The rotation angle of the actuating piece 992 is limited by a stopper 95 protruding from the side wall 68. A mounting plate 96 is rotatably supported on the side wall 68 by a shaft 98 at a position opposite to the rotation shaft 72 with respect to the shaft 80 .

An operating rod 100 is provided on the mounting plate 96 so as to be rotatable around the axis of the shaft 98 . The side wall 68 has an operation rod 1
An arcuate hole 102 into which 00 is loosely inserted is bored. At both ends of the circular arc hole 102, locking notches 104 and 105 are formed that extend toward the shaft 98. The operating rod 100 can move integrally with the mounting plate 96 around the axis 98 and along the arcuate hole 102. If the operating rod 100 is locked in the locking notches 104 and 105, rotation of the mounting plate 96 can be prevented. One end of a spring 106 with a relatively large spring constant and a spring 108 with a relatively small spring constant are attached to different positions in the circumferential direction of the mounting plate 96.

The other ends of the springs 106 and 108 are connected to the branch end 1 of the strip plate 110.
12 and 114, respectively. The strip plate 110 is
For example, it may be made of metal and has flexibility. The strip plate 110 is partially wrapped around the outer circumferential surfaces of the pulleys 88 and 84, and further partially wrapped around the outer circumferential surface of the pulley 78, and is fixed by screws 116. One spring 106 is used when the photosensitive paper 6 is relatively large, such as A3 or B4, and therefore relatively heavy. The other spring 108 is used when the photosensitive paper 6 is relatively small and has a relatively low weight, such as A4 or B5. The operation will be described with reference to FIGS. 1 to 4.

When the document insertion table 18 is opened and comparatively large A3 or B4 photosensitive paper 6, for example, is loaded in the photosensitive paper container 40, the operating rod 100 is locked in the locking notch 104.
When the document insertion table 18 is closed as shown in FIGS. 1 and 4, the actuating piece 92 uses the protrusion 94 to rotate the movable plate 82 counterclockwise around the shaft 80. As shown in FIG. Therefore, the strip 110 is tensioned by the spring 106 with a relatively large elastic force. At this time, the pulley 78 and rotation shaft 72 have
A counterclockwise elastic torque acts, and the lift lever 64 elastically raises the front end of the photosensitive paper loading plate 44 accordingly. Therefore, the uppermost surface 6a of the photosensitive paper comes into resilient pressure contact with the paper feed roller 74. In this state, the lower surfaces of the top portions 52a, 54a of the stopper claws 52, 54 maintain close proximity to the top end of the uppermost surface 6a of the photosensitive paper without being in substantial pressure contact.
The pressing force between the uppermost surface 6a of the photosensitive paper and the paper feed roller 74 is determined by the elastic force of the spring 106, and the spring constant of the spring 106 is set to an optimum value so that this pressing force can reliably feed only one sheet of photosensitive paper. The value is preselected. Original insertion table 18
When opened as shown by the imaginary line in FIG. 4, the actuating piece 92 allows the movable plate 82 to rotate clockwise by its protrusion 94. Therefore, the band plate 110 is loosened, and the pulley 78, rotation shaft 72, and lift lever 64 can freely rotate clockwise. Therefore, the spring 106, which was in the tensioned state as shown in FIG. 3, becomes slack as shown by the imaginary line 106a in FIG. In response, the photosensitive paper 6 and the photosensitive paper mounting plate 44 descend under their own weight, and the pressure contact between the uppermost surface 6a of the photosensitive paper and the paper feed roller 74 is broken. Therefore, the photosensitive paper container 40 can be easily removed from the machine body 2. For example, the photosensitive paper 6 is A
4, B5, the operating rod 100 is locked in the locking notch 105 as shown in FIG.

Therefore, the strip 110 and therefore the pulley 78 have a spring 1
08 exerts a relatively small elastic force. Therefore, the lift lever 64 pushes up the photosensitive paper loading plate 44 and transfers the uppermost surface 6a of the photosensitive paper to the paper feed roller 74 using the optimal spring force to reliably feed only one sheet of photosensitive paper without having to feed two sheets. Press with the appropriate pressure. In this way, depending on the weight of the photosensitive paper 6, the pressure contact force between the uppermost surface 6a of the photosensitive paper and the paper feed roller 74 is maintained at the optimum value for feeding the photosensitive paper, so that two sheets of photosensitive paper can be fed. This will ensure that only one sheet is sent.

According to the idea of the present invention, the top portions 52 of the locking claws 52, 54
The lower surface of the photosensitive paper 6a, 54a and the tip of the uppermost surface 6a of the photosensitive paper 6 placed on the photosensitive paper mounting plate 44 have a small distance and do not come into contact with each other, or even if they do, they contact with very little pressure. Compared to the conventional case where the contact pressure is relatively large, according to the present invention, feeding of two sheets of photosensitive paper 6 is prevented as shown in Table 1 below.

The experimental results in Table 1 were obtained using the diazo copying machine of the illustrated example under the conditions (1) to (4) described below.
These values were obtained by repeating the same experiment a total of four times, from the first to the fourth, under each of these conditions. The photosensitive paper used in the experiment was diazo ED photosensitive paper manufactured by Sanda Kogyo Co., Ltd.
The size is JISA4 and A3 size, and it weighs 68kg.
/M3. In Table 1, the photosensitive paper for A4 is JIS.
The case of A4 size is shown, and A3 shows the case of JISA3 size photosensitive paper. The numerical values in Table 1 are the number of times when 2 to 3 sheets of paper were fed or the paper was not fed again when 500 sheets of photosensitive paper were fed. (1) and (2)
The condition is that, as in the prior art, the conventional locking pawl 52,
54 (illustrated reference numerals are used for convenience of explanation)
2a and 54a, the uppermost surface of the photosensitive paper is always set at a pressure of 20 g and 10 f1, respectively. According to the present invention, the condition (3)
, 54a, the pressure with which the uppermost surface of the photosensitive paper is pressed down is always set to zero. Condition (4) is according to the present invention,
A distance of two inches is always left in the vertical direction between the lower surfaces of the tops 52a, 54a of the stopper claws 52, 54 and the uppermost surface of the photosensitive paper. From Table 1, (3) and (4) according to the invention
It can be seen that under these conditions, the number of times the photosensitive paper is fed 2 to 3 sheets is extremely small. FIG. 6 is a perspective view showing the right side of the automatic paper feeder 4 of the diazo copying machine shown in FIGS. 1 to 4, and FIG. 7 is a simplified right side view thereof.
FIG. 8 is a simplified perspective view thereof.

In the leading edge alignment device 16, a document inserted through a document insertion port 22 is conveyed through a document conveyance path 12 formed by upper and lower guide plates 120, 122. Original transport path 12
Sequentially from the top to the bottom (from the left to the right in Figure 8),
A pair of feed rollers 124, 126, detection switch 1
28, as well as the document feed roller 130 and the pressure contact member 1
32 are arranged. In the merging conveyance path 14, a pair of delivery rollers 134, 136 and a stop member 138 are sequentially arranged along the conveyance direction. The shaft 140 of one feed roller 124 is connected to both side walls 142 of the cover 20,
144 so as to be rotatable.

The shaft 146 of the document feed roller 130 is connected to the side walls 142, 144.
It is pivoted by rolling bearings. A shaft 148 of one of the feed rollers 134 is pivotally supported by brackets erected on the side walls 142 and 144, respectively. These axes 14
Sprocket wheel 15 is installed at the shaft end of 0,146,148.
0,152,154 are fixed respectively, and the chain 156
is driven by 1. Another sprocket wheel 158 is secured to the shaft 148. This sprocket wheel 158 and a sprocket wheel 160 attached to the paper feed roller shaft 76 via a spring clutch 194, which will be described later, are driven by a chain 162. The chain 162 is driven via an electromagnetic clutch 246,
Therefore, the feed roller 124 and the document feed roller 13
0 and the feed roller 134 are connected to the electromagnetic clutch 246
is being rotated when it is in the on state. The side walls 142, 144 of the cover 20 are pivotally supported on the shaft 148 by underbelly bearings, so that the cover 20 can be rotated about the shaft 148 to open. The electromagnetic clutch 246 is electrically connected to the safety switch 235 as described later, and turns off when the photosensitive paper runs out or when the document insertion table 18 is opened, and the automatic paper feeder is switched off. The driving of four four is stopped.

The shaft 164 of the other feed roller 126 is connected to the side wall 68,
A pair of swinging arms 166 pass through 70 so as to be vertically displaceable.
It is pivoted at one end of the .

The other end of the swing arm 166 is connected to the side wall 68 by a pin 168.
, 70. A follower 170 protruding from the swing arm 166 has a cam 172 fixed to the paper feed roller shaft 76.
to sway. A shaft 174 of the other delivery roller 136 passes through the side walls 68 and 70 so as to be vertically displaceable, and is pivotally supported by a pair of elevating pieces 176. The elevating piece 176 has a vertically elongated hole 178 extending in the vertical direction, and the vertical displacement direction is defined by a pin 180 that is loosely inserted into the elongated hole 178 and stands on the side walls 68 and 70. The elevating piece 176 has a horizontally elongated hole 181 extending perpendicularly to the vertical displacement direction. On the side walls 68, 70,
A swing arm 184 is pivotally supported by the pin 182 .
A pin 186 fixed to one end of the swing arm 184 is loosely inserted into the horizontally elongated hole 181. A hologram 188 fixed to the other end of the swing arm 184 is driven by a arm 190 that is integral with the paper feed roller shaft 76 . FIG. 9 shows the paper feed roller shaft 76
FIG. 3 is a sectional view showing a spring clutch 194 provided near the end of the spring clutch 194 .

The boss 196 of the sprocket wheel 160 is loosely fitted to the paper feed roller shaft 76 . The end plate 197 is the paper feed roller shaft 7
6. A boss 198 integral with this end plate 197
is abutted against the boss 196 and is fitted and fixed to the paper feed roller shaft 76. A coil spring 200 is attached to the bosses 196 and 198 so that the coil springs 200 extend almost tightly over both bosses 196 and 198.
is inserted. One end 201 of the coil spring 200 is fixed to the end plate 197 and thus to the paper feed roller shaft 76 . The other end 202 of the coil spring 200 is fixed to a ratchet wheel 192 surrounding the coil spring 200. The winding direction of the coil spring 200 is the rotation direction 20 of the sprocket wheel 160.
When the coil spring 200 is twisted in 3, the coil spring 200
is determined in the direction in which the bosses 196 and 198 are tightened. Therefore, the pawl 210 is engaged with the ratchet wheel 192, and the ratchet wheel 1
When the rotation of the coil spring 20 is prevented, the rotation of the coil spring 20 is prevented.
0 releases the tightening force on the boss 196, so the torque of the sprocket wheel 160 is not transmitted to the paper feed roller shaft 76 via the boss 198. When the electromagnetic plunger 216 is energized and the claw 210 is disengaged from the ratchet wheel 192, the coil spring 200 is moved against the bosses 196, 19.
8 is tightened, so that the paper feed roller shaft 76 rotates integrally with the sprocket wheel 160. The ratchet wheel 192 has
The claw 210 can be engaged and disengaged.

The pawl 210 is formed at one end of an arm 214 that is pivotally supported on the side wall 70 by a pin 212. The other end of arm 214 is pin-coupled to movable piece 218 of electromagnetic plunger 216 . When the electromagnetic plunger 216 is not energized, the seventh
The movable piece 218 is extended as shown in FIGS. It is not transmitted to the shaft 76. When the electromagnetic plunger is energized, the movable piece 218 retracts, thereby disengaging the pawl 210 from the pawl wheel 192, and the power from the sprocket wheel 160 is transferred to the spring clutch 1.
The signal is transmitted to the paper feed roller shaft 76 via the paper feed roller 94, and the paper feed roller 74 is rotated. FIG. 10 is an electrical circuit diagram including the detection switch 128 and the electromagnetic plunger 216.

FIG. 10 shows a state where the original is not being conveyed. One contact 128a of the detection switch 128 is connected in series with the relay 222, and the other contact 128b is connected in series with the relay switch 224 of the relay 222 and the rectifier circuit 226. A capacitor 228 is connected in parallel to the relay 222 . The electromagnetic plunger 216 is excited by the DC output of the rectifier circuit 226 . Relay switch 224 is conductive only when relay 222 is energized. The detection switch 128 has an actuator 220 that responds to the leading edge of the document being conveyed.
When the contact 20 is rotationally displaced by the document, the conductive state is switched from the contact 128a to the contact 128b.

When the contact 128a is cut off, the relay 222 remains energized momentarily for a short period of time corresponding to the amount of electricity charged in the capacitor 228, so that the relay switch 224 is activated after the contact 128a is cut off. Maintains continuity for a certain amount of time. Therefore, the electromagnetic positive gear 216 is
It is only momentarily energized for the short period of time. Therefore, by disengaging the pawl 210 from the ratchet wheel 192, the pawl 210) re-engages with the ratchet wheel 192 after the ratchet wheel 192 has rotated once.

Therefore, when the document is conveyed, the paper feed roller shaft 7
Only 6 single revolutions are achieved. The photosensitive paper transport path is arranged such that one rotation of the paper feed roller 74 transports the photosensitive paper transport path 8 by a distance sufficient for the leading edge of the topmost sheet of the photosensitive paper 6 to come into contact with the stop member 138. A length of 8 is set.
Pressing member 13 that presses against the outer peripheral surface of document feed roller 130
2 is made of, for example, a metallic spring steel material.

Guide plate springs 230 and 232 provided in the document transport path 12
As is clear from FIG. 12, which will be described later, serves to ensure that the leading edge of the document comes into contact with the stop member 138. A guide plate spring 234 provided in the photosensitive paper conveyance path 8 allows the leading end of the photosensitive paper 6 to stop at the stop member 138 when the feed roller 136 is in the lowered position as shown in FIGS. 11 and 12, which will be described later.
When the feed roller 136 rises from the lower yielding state, it presses the photosensitive paper 6 against the feed roller 136, thereby causing the photosensitive paper 6 to come into contact with the feed roller 136.
The document and the photosensitive paper are prevented from returning to the upper side of the photosensitive paper transport path 8 (to the left in FIG. 7), and the document and the photosensitive paper are
Make sure it's sandwiched between 6. To explain the operation, first, as shown in FIG. 8, the electromagnetic plunger 216 is not excited, so the pawl 210 remains engaged with the pawl wheel 192, and the cam 172 pushes up the follower 170 and moves the feed roller. Assume that the rollers 124 and 126 are in pressure contact with each other, and the feed rollers 134 and 136 are in pressure contact with each other due to the action of the cam 190 and the follower 188.

At this time, the feed rollers 124, 126, the document feed roller 130, the feed rollers 134, 136, and the sprocket wheel 160 are constantly rotating. In this state, when a document is next inserted through the document insertion slot 22, the document is conveyed by the feed rollers 124 and 126. Referring to FIG. 11, the leading edge of the document rotationally displaces the actuator 220 of the detection switch 128.

Therefore, the switching mode of the detection switch 128 changes, and the electromagnetic plunger 216 is changed by the electric circuit shown in FIG.
is instantaneously excited. Therefore, the arm 214 is rotated clockwise around the pin 212, and the pawl 210 and the ratchet wheel 192 are disengaged. Then, the rotational power from the sprocket wheel 160 is transmitted to the paper feed roller shaft 76 via the spring clutch 194. 12th
Referring to the figure, when the paper feed roller shaft 76 is rotationally driven, the rims 172 and 190 rotate integrally therewith.

The follower 170 responds to the cam 172, which causes the swinging arm 166 to pivot counterclockwise around the pin 168 under its own weight, thereby causing one of the feed rollers 1
The other feed roller 126 is separated from 24. At the same time, the follower 188 responds to the cam 190, which causes the swinging arm 184 to rotate clockwise around the pin 182 by its own weight, causing the lifting piece 176 to descend, thereby causing one of the feed rollers to move downward. The other feed roller 136 is separated from 134. However, the feed roller 124
, 126 are separated immediately after the leading edge of the document is sandwiched between the document feed roller 130 and the pressing member 132.

Therefore, even after the feed rollers 124 and 126 are separated, the document remains between the document feed roller 130 and the pressing member 13.
It is transported by the action of 2. Paper feed roller shaft 76
Therefore, by the rotation of the paper feed roller 74, only one sheet of the photosensitive paper 6 is conveyed to the photosensitive paper conveyance path 8. Photosensitive paper 6
The guide plate spring 234 prevents the photosensitive paper 6 from rising from the conveying path 8, and the leading edge of the photosensitive paper 6 is held at the stop member 138.
further conveyance is prevented. Therefore, if the paper feed roller 74 continues to rotate after the photosensitive paper 6 has stopped, the photosensitive paper 6 may become slack. Therefore, the length of the photosensitive paper transport path 8 is selected so that such slackness can be suppressed to an extent that does not adversely affect accurate alignment of the leading edges of the original and the photosensitive paper. The leading edge of the original being sandwiched between the original feeding roller 130 and the pressing member 132 is guided by the guide plate springs 230 and 232, and the original is stopped by the stopping member 13.
8.

After the leading edge of the original contacts the stop member 138, the orientation of the original changes depending on the force in the conveying direction applied to the original until the leading edge accurately aligns with the stop member 138 and therefore coincides with the leading edge of the photosensitive paper 6. It is then corrected. The pressing force between the document feeding roller 130 and the pressing member 132 is set in advance so that the document is stopped without loosening after straightening. In addition,)
The guide leaf springs 230, 232, 234 are connected to the stop member 138.
Since the sheet 6 is provided so as to extend up to 100 degrees, even if the advance of the original and the photosensitive paper 6 deviate from each other, mutual interference can be avoided.

Referring to FIG. 13, when the paper feed roller shaft 76 rotates once, the pawl 210 engages with the ratchet wheel 192, and the rotation of the paper feed roller shaft 76 is stopped.

At the same time, the cams 172 and 190 displace the followers 170 and 188 to rotate the swing arms 166 and 184, causing the feed roller 126 and the feed roller 136 to rise. Therefore, the feed rollers 124, 126 and the feed rollers 134, 136 are brought into close contact with each other. In response, the feed rollers 134 and 136 force the document and the photosensitive paper 6, whose edges have been aligned, to move in the conveying direction while keeping them stacked one on top of the other. Therefore, the leading ends of both papers are conveyed over the stop member 138. As described above, after the leading edge of the document contacts the stop member 138 while the feed rollers 134 and 136 are separated, the feed roller 1
During the correction time until the original and the photosensitive paper 6 are sent out after the originals 34 and 136 are brought into pressure contact, the leading edge of the original follows the stop member 138, and the posture of the original is corrected.

No matter what orientation the original is inserted from the original insertion table 18, in order to correct the orientation of the original as accurately as possible during this correction time, the position of the actuator 220 of the detection switch 128 along the original transport direction must be adjusted. Also, the outer diameter and rotation speed of the document feed roller 130 are appropriately selected. FIG. 14 shows the stopper claws 52, 54 and the paper feed roller 7.
4 is an enlarged view of the vicinity.

In this embodiment, the relative positions of the stopper claws 52 and 54 and the paper feed roller 74 are constant regardless of the amount of photosensitive paper 6 loaded. Therefore, in a state where the loaded amount of photosensitive paper 6 is relatively large, the tip of the uppermost surface 6a of the photosensitive paper 6a is connected to the centering claws 52, 54.
If the relative positions of the stopper claws 52 and 54 and the paper feed roller 74 are set so that they do not come into substantial pressure contact with the tops 52a and 54a of the photosensitive paper mounting plate 44 when the amount of photosensitive paper 6 loaded is small, The angle of inclination formed with respect to the horizontal becomes large, so that the tip of the uppermost surface 6b of the photosensitive paper comes into contact with the tops 52a and 54a with undesirably large pressure. In order to solve this problem, as shown in FIG. 15, a rubber piece 231 is pasted on the photosensitive paper mounting plate 44 in a position corresponding to the paper feed roller 74. The rubber piece 231 keeps the inclination angle of the photosensitive paper mounting plate 44 small even when the amount of photosensitive paper 6 loaded is small, so that the top end of the photosensitive paper 6 is substantially pressed against the tops 52a and 54a. prevent that. Referring again to FIG. 7, the rotation shaft 72
A cam 233 is fixed to the shaft end of the cam 233.

An actuator 236 of a safety switch 234 is in sliding contact with the peripheral end of this cam 233. When the photosensitive paper 6 runs out,
The large diameter portion 233a of the cam 233 presses the actuator 236. Therefore, the safety switch 235 has its contact 2
37 (see FIG. 10) to contact 239. Therefore, relay 242 is energized. The relay switch 244 of the relay 242 is conductive when the relay 242 is in a non-energized state, and is cut off when the relay 242 is in an energized state. When the relay switch 244 is cut off, the electromagnetic clutch 246 is turned off. Accordingly, the driving of chain 162 and sprocket wheel 160 is stopped. A pin 238 is provided upright on the side surface of the cam 233.

A link 240 having an elongated hole 239 into which a pin 238 is loosely inserted.
is inserted into the document insertion table 18. Therefore, when the document insertion table 18 is opened as shown by the imaginary line in FIG.
The large diameter portion 233'b of No. 3 pushes the actuator 236 to switch the contact 237 of the safety switch 235 to the contact 239. In response, the electromagnetic clutch 246 is turned off, and the chain 162 and sprocket wheel 160 are stopped.
This keeps you safe. According to the apparatus of the present invention as described above, when the leading edge of the document contacts the stop member while the feed roller is separated, the document is further moved in the conveyance direction by the action of the document feed roller and the pressure contact member. Since the force is continuously applied, it is possible to correct the skewed feeding of the original and accurately align the leading edge of the original with the leading edge of the photosensitive paper, thereby preventing paper jams and damage due to skewed feeding.

[Brief explanation of drawings]

FIG. 1 is a simplified vertical cross-sectional view of one embodiment of the present invention, and FIG.
The figure shows the edge alignment device 16 and document insertion table 1 in Figure 1.
FIG. 3 is a perspective view showing the left side of the automatic paper feeder 4 of the diazo copying machine shown in FIG. 1, and FIG. 4 is a partially cutaway view showing the left side of the automatic paper feeder 4. 5 is a simplified partially cutaway left side view of FIG. 3, FIG. 6 is a perspective view showing the right side of the automatic paper feeder 4 of the diazo copying machine shown in FIG. 1, and FIG. FIG. 6 is a simplified right side view, FIG. 8 is a sectional view of the tip alignment device 16, and FIG. 9 is a simplified right side view of the paper feed roller shaft 76.
An enlarged sectional view of the vicinity, Figure 10 is an electrical circuit diagram, Figure 11,
12 and 13 are cross-sectional views for explaining the operation of the edge aligning device 16, FIG. 14 is a cross-sectional view of the vicinity of the paper feed roller 74, and FIG. 15 is a cross-sectional view showing an improved structure of FIG. 14. It is a diagram. 2... Airframe, 4... Brake paper feeder, 6...
...Photosensitive paper, 8...Photosensitive paper transport path, 10
. . . Photosensitive paper transport device, 12 . . . Document transport path, 14 . . . Merging transport path, 16 . . .
Edge alignment device, 18... Original insertion table,
40... Photosensitive paper container, 44... Photosensitive paper mounting plate, 52, 54... Stopping claw, 64...
... Lift lever, 72 ... Rotation axis, 76.
...Paper feed roller, 78, 84, 88...
Pulley, 96... Mounting plate, 106, 108...
... Spring, 110 ... Band plate, 124, 12
6...Feed roller, 128...Detection switch, 130...Document feed roller, 13
2... Pressure contact member, 134, 136...
Feeding roller, 138...Stopping member, 172
, 190... cam, 192... ratchet wheel,
210...Claw, 216...Electromagnetic plunger.

Claims (1)

[Claims] 1. In an automatic paper feeder of a copying machine, which guides the original from the original transport path and the photosensitive paper from the photosensitive paper transport path to a combined transport path, and aligns the leading edges of the original and the photosensitive paper in this combined transport path, A detection means 128 provided in the document transport path detects the conveyance of the document, a document feed roller 130 provided in the document feed path, and a document feed roller 130 that is in pressure contact with the outer peripheral surface of the document feed roller 130. A pressure contact member 132 for pinching and feeding the original, a paper feed roller 74 that contacts the uppermost surface 6a of the stacked photosensitive paper 6 and feeds the photosensitive paper 6 one by one to the photosensitive paper transport path, and the detection means. means 160, 162, 194, 210, 216 for driving paper feed roller 74 one revolution in response to the document detection output from 128;
A stop member 138 provided on the merging conveyance path and having a tip alignment protrusion; a pair of delivery rollers 134 that are provided on the merging conveyance path behind the front raising stop member 138 in the conveying direction and can be moved toward and away from each other; 136 and paper feed roller 7
4, a swinging arm 184 having a follower 188 at one end that responds to the cam 190;
It includes an elevating piece 176 that is provided in relation to the other end of the swinging arm 184 and on which one feed roller 136 is pivotally supported.
The length of the photosensitive paper conveyance path 8 is selected such that the tip of the photosensitive paper conveyance path 8 contacts the protrusion of the stop member 138, and the cam 190 is moved only during the period when the paper feed roller 74 is rotating.
The swinging arm 184 according to 88 displaces the elevating piece 176 so that the feed rollers 134 and 136 move away from each other, whereby the original and the photosensitive paper 6 come into contact with the protrusions and the alignment of the leading edges is completed. After one rotation of the paper feed roller 74 is completed, the cam 190 moves the elevating piece 176 by the swing arm 184 so that the feed rollers 134 and 136 approach each other, and at this time, the alignment of the ends is completed. An automatic paper feeder for a copying machine, characterized in that a document and photosensitive paper are fed out over the protrusion.