JPH0255776B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is, for example, a device which is removably attached to the upper part of an electrostatic copying machine, and which feeds originals one by one into an exposure scanning window provided at the upper part of the electrostatic copying machine. The present invention relates to a feeding device for running.

In the prior art, an upper feed roller and a lower separation roller are arranged in a comb-like manner with an interval in the axial direction at the front of the inclined document table in the transport direction, and the lower separation roller is arranged in the opposite direction to the transport direction. The document tray is rotated to send out only the uppermost layer of documents that are descending under their own weight on the document table, thereby preventing the conveyance of the second and subsequent documents. According to this prior art, since the outer peripheral surfaces of both rollers are convoluted along the width direction of the document, there is a risk that the document may be deformed or the front edge of the document may be bent.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a feeding device that can reliably feed documents one by one while preventing deformation of the documents.

FIG. 1 is a sectional view of a feeding device 90 according to an embodiment of the present invention, and FIG. 2 is a perspective view of an electrostatic copying machine equipped with the feeding device 90 shown in FIG. This feeding device 90 is detachably attached to the upper part of the body 2. By installing the feeding device 90,
It is possible to automatically copy each original document, which is a plurality of sheet members.

Multiple sheets of stacked originals are stored in the original insertion slot 230.
The document is inserted from the top and placed on the inclined document table 232. The original descends diagonally downward toward the front along the original placing table 232 due to its own weight, and
A feed roller 234 and a separation roller 236 feed the documents one by one, starting from the top layer. The original is guided by the guide plate 238 and transferred to the transport roller 5.
6, 59, and is scanned by passing through conveyance rollers 60, 63 and an exposure scanning window 64. After scanning is completed, the original is reversed from the conveyance rollers 66 and 69 and guided by an upwardly curved guide plate 240 to a pair of ejection rollers 242 and 244, and ejected from the ejection rollers 242 and 244 onto a document receiver 246. be done. Therefore, when the feeding device 90 is installed, the document is transferred to the document tray 70 attached to the machine body 2.
The document is not discharged upward, but is discharged onto the document receiver 246 of the feeding device 90.

Driven conveyance rollers 59 , 63 , and 69 respectively corresponding to drive conveyance rollers 56 , 60 , and 66 pivotally supported on the upper part of the body 2 are pivotally supported on the feeding device 90 . With the feeding device 90 mounted on the upper part of the machine body 2, each driven conveyance roller 59, 63, 69 is connected to the corresponding driving conveyance roller 56, 6 by a spring (not shown).
0 and 66, respectively. Between the conveyor rollers 59 and 63 and the conveyor roller 6
Crimp plates 121 and 123 are provided between 3 and 69, respectively. A locking piece 245 is provided to protrude from the front end (left side in FIG. 1) of the feeding device 90 in the transport direction. Notch 2 opened below this locking piece 245
47 is locked to the pin 136 of the body 2, and the feeding device 90 is detachably attached to the body 2.

FIG. 3 is a simplified longitudinal cross-sectional view of the copying machine shown in FIG. 2, viewed from behind. A gear train 250 is provided on the gear 248 coaxial with the conveying roller 59 of the feeding device 90.
A gear 252 coaxial with the feed roller 234
and a gear 254 coaxial with the separation roller 236 are individually connected. The feed roller 234 and separation roller 236 are driven to rotate in the same direction. A gear 258 coaxial with the discharge roller 242 is connected to a gear 255 coaxial with the conveyance roller 69 via a gear train 256 .

By turning on the power switch 92, the motor 96
is constantly rotated. Sprockets 98 and 100 are coaxially provided on the rotating shaft of this motor 96.
Chain 1 wrapped around one sprocket 98
02, the guide roller 36, the conveyance roller 2
6. The transport roller 17 and the paper feed roller 10 are rotationally driven. A chain 104 wrapped around the other sprocket 100 drives the discharge roller 44 and the pressure roller 40 to rotate. A paper feed clutch 106 is interposed between the rotating shaft of the paper feed roller 10 and a sprocket around which a chain 102 is wound. The chain 102 is an electromagnetic clutch 10 that can be in three states: forward rotation, reverse rotation, and disconnection.
It can be wrapped around the input side of 8. Electromagnetic clutch 108
A chain 110 wound around the output side of the drive conveyance rollers 56, 60, and 66 is rotated. When the electromagnetic clutch 108 is in its forward rotation state, the electromagnetic clutch 108
The rotational torque of Chain 1 is applied in the forward direction shown by the arrow.
Tell 10. The document is thereby transported in the copy exposure direction 112 at a relatively low speed. In the reversal condition, the rotational torque of chain 102 is transmitted in the opposite direction to chain 110 via electromagnetic clutch 108, and the document is returned at a relatively high speed in a direction opposite to the direction of copy exposure operation 112. In the disconnected state, the rotational torque of chain 102 is not transmitted to chain 110.

Figure 4 shows the feed roller 234 and separation roller 2.
5 is a plan view of FIG. 4, and FIG. 6 is a partially cutaway sectional view of FIG. 5 viewed from the insertion side (right side of FIG. 1). As shown in FIG. 4, a plurality of originals are stacked on top of each other with their front ends shifting forward in the conveying direction as the upper layer becomes the upper layer, and placed on the original mounting table 232. The width of each document is adjusted by side edge regulating plates 260 and 262 that are movable in the width direction of the document table 232 (in the vertical direction in FIG. 5).

In front of the document placement table 232 in the conveying direction, a feed roller 234 is provided above, and a separation roller 2 is provided below.
36 are provided. The feed roller 234 is attached to a rotating shaft 264 via a one-way clutch 263. At the end of this rotating shaft 264, there is a conveying roller 5.
A gear 252 connected to the gear 248 of No. 9 is loosely fitted, and a boss 252a of the gear 252 is connected to the rotation shaft 2.
64. The boss member 266 is fixed to the rotating shaft 264 by being abutted against the boss 252a. A spring 268 is provided surrounding the boss 252a and the boss member 266, and a ratchet wheel 270 is further provided surrounding the spring 268. The spring 268 is attached to the boss 252a along the normal rotation direction of the rotating shaft 264.
and the boss member 266, one end of which is connected to the boss member 266,
The other end is connected to a ratchet wheel 270. The ratchet wheel 270 and the spring 268 constitute a so-called lap spring clutch. An electromagnetic solenoid 298 (see FIG. 3) is provided having a pawl 296 that engages ratchet wheel 270. When the electromagnetic solenoid 298 is energized,
The claw 296 is disengaged from the ratchet wheel 270, and in this state, the rotational torque of the gear 252 is transmitted to the rotating shaft 264. In addition, when the electromagnetic solenoid 298 is in a non-energized state, the pawl 296 is engaged with the pawl 270, and in this state, the gear 252 idles around the rotating shaft 264, and the rotational torque of the gear 252 is not transmitted to the rotating shaft 264. .

Referring to FIG. 7, a feed roller 234 and a separation roller 236 are provided at a distance δ apart from each other at a position of a line 272 (hereinafter referred to as a line of separation action) connecting the centers of each roller 234, 236. This distance δ is selected to be a value sufficient to convey the documents one by one. The rotation directions of the feed roller 234 and the separation roller 236 are the same. Therefore, at the position of the separation line of action 272, both rollers 2
The feeding directions of 34 and 236 are mutually opposite directions,
The feed roller 234 is rotated so as to send the document forward in the transport direction, and the separation roller 236 is rotated so as to send the document backward in the transport direction. Therefore, when the stacked originals are shifted forward in the conveying direction as the front edge becomes the upper layer and are lowered by their own weight along the document placement table 232, the uppermost original is moved forward in the conveying direction by the feed roller 234. sent,
The originals in layers lower than the topmost original are returned to the rear in the transport direction by separation rollers 236. Therefore, the documents are conveyed one by one starting from the top layer.

Further, in order to reliably feed the documents one by one, feed guide plates 274 are provided on both sides of the feed roller 234 and separation roller 236. The feed guide plate 274 is rotatably supported below the document table 232 by a shaft 276 parallel to the rotation shaft 264 . This feed guide plate 274 is
It extends from the shaft 276 to a position forward of the separation line of action 272 in the conveying direction, is bent, and extends perpendicular to the separation line of action 272 . A friction plate 278 made of a material having high frictional force and wear resistance, such as urethane, is adhered to the upper surface of the feed guide plate 274. These separation rollers 236 and feed guide plate 274 constitute separation means 300. The bent portion 280 of the feed guide plate 274 is located closer to the feed roller 234 than the tangent to the separation roller 236 that is perpendicular to the separation line of action 272 . Shaft 2 of feed guide plate 274
A screw hole 282 having an axis perpendicular to the shaft 276 is formed at the end 274a of the roller 76 opposite to the rollers 234, 236. The front plate 284 of the feeding device 90 has a threaded rod 2 that rotatably passes through the front plate 284 and is screwed into the screw hole 282.
86 is provided. By rotating the head 286a of the threaded rod 286 located outside the front plate 284, the end 274a of the feed guide plate 274 is threaded along the threaded rod 286, so that the feed guide plate 274 is rotated about axis 276. Thereby, the position of the feed guide plate 274 along the line of separation action 272 can be freely adjusted.

By providing the feed guide plate 274, even if two originals overlap and are conveyed beyond the line of separation action 272, only the upper one of the two originals can be sent out. That is, the lower original comes into sliding contact with the friction plate 278 of the feed guide plate 274, receives a large frictional force, and is stopped from moving forward in the transport direction. Therefore, only the upper original document is sent out reliably.

Even when the feeding device 90 is attached to the machine body 2, the original can be manually fed from the original insertion opening 54 along the original insertion cursor 52. In this case, the original for which the copying operation has been completed is discharged onto the original receiver 246 of the feeding device 90.

As described above, according to the present invention, the uppermost layer of originals is placed directly below the feed roller, which rotates in the direction to send out the uppermost layer of originals, which is lowered by its own weight on the document mounting table. Separation rollers that rotate so as to send the lower document backward in the transport direction are provided, and separation rollers are installed on both sides of both rollers that are forward of the line in the transport direction and perpendicular to the line that connects the centers of the two rollers. Since a feed guide plate is provided that contacts the lower document layer on the feed roller side of the tangent line and generates a frictional force, the document is not deformed as in the prior art, and moreover, the document can be reliably fed one by one. can do.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a feeding device 90 according to an embodiment of the present invention, FIG. 2 is a perspective view of an electrostatic copying machine equipped with the feeding device 90 shown in FIG. Simplified longitudinal sectional view from behind the copying machine shown in Figure 4.
5 is a plan view of FIG. 4, FIG. 6 is a partially cutaway sectional view of FIG. 5 as seen from the insertion side, and FIG.
The figure is a sectional view of the vicinity of the feed roller 234 and separation roller 236. 2... Body, 90... Feeding device, 234... Feed roller, 236... Separation roller, 272... Separation line of action, 274... Feed guide plate, 278...
Friction plate, 300...separation means.

Claims (1)

[Scope of Claims] 1. A feeding device that feeds sheet members while separating them, comprising: a feed roller for conveying the sheet member to the downstream side; and a separation unit that cooperates with the feed roller to separate the sheets. (i) a separation roller that rotates in the same direction as the feed roller and sends the sheet member upstream; and (ii) a separation roller that moves the sheet member downstream of the separation roller in the conveyance direction. a feed guide plate that is in contact with the feed roller and has a friction member for preventing double feeding of sheet members, and the feed guide plate is further downstream in the conveyance direction from a separation action line connecting the centers of the feed roller and the separation roller. , on the feed roller side from the tangent to the separation roller perpendicular to the separation line of action,
The upper surface of the feed guide plate having the friction member is positioned so that the sheet members that are not separated by the separation roller and are fed in duplicate are separated by the cooperation of the feed guide plate and the feed roller. Characteristic feeding device. 2. The feeding device according to claim 1, wherein the feeding guide plate is adjustable along the line of separation action.