JPS6035655B2 - Copy machine document feeder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a document feeder for a copying machine that positions a document table, places a document thereon, and exposes the document.

2. Description of the Related Art A document feeder for a copying machine is well known, which automatically feeds a document in the document feed direction using the feed center line as a reference.

In this device, the positioning of the original is mechanically complicated, and the manufacturing cost is also inevitably high. On the other hand, in the present invention, the document is scanned based on the two side greens of the document proofing stand that are orthogonal to each other, that is, the front side green when viewed in the document feeding direction and the other side green that is orthogonally adjacent to this side green. This paper attempts to propose a document feeding device that performs automatic positioning. Embodiments of the invention will be described below with reference to the accompanying drawings.
In FIG. 1, a document feeding device 2 according to the present invention is installed in a main body 1 of a copying machine, and 2A indicates a lid-mounted base of the device and 3
is a drive unit for the document supply device.

Although the drive unit 3 is formed separately from the document supply device in the illustrated embodiment, it is of course possible to form them integrally. Sheet cassettes 4 and 5 are attached to the side of the copying machine body 1, and seeds of different sizes are stacked and stored in these cassettes, and sheets of either size can be selected by operating a switching knob 6. It is designed to be supplied into the copying machine 1 at the same time. 7 is a discharge tray for used originals; 8 is a pressure plate used when the original feeding device 2 is lifted up as shown by the chain line; 9 is a copying machine control switch;
Knobs etc. are shown.

In FIGS. 2 and 3, the document feeder 2 is pivotally attached to the copying machine body 1 at 10, so that the document feeder 2 is attached to the pivot portion 10, as shown by the broken line in FIG. It is possible to rotate it around.

At this time, the manuscript calendar glass 11 is released, and it becomes possible to copy thick manuscripts such as books in cooperation with the pressure plate 8. The document supply device 2 includes a drive roller 12 and a support roller 1.
A feed belt 14 is hung between the third
As shown in the figure, a plurality of feed belts 14 are arranged parallel to each other, in which case each of the feed belts is arranged obliquely relative to the feed direction, for example, by about 50 degrees. A plurality of drive rollers 12 and support rollers 13 corresponding to each feed belt are mounted on a common drive shaft 15 and a common shaft 16, respectively. The drive shaft 15 is rotationally driven by a drive motor 201 via a pair of gears 17 and 18 and a clutch 19. 21 is a solenoid for controlling the clutch 19.

The downstream end in the running direction of the upper running part of the belt 14, that is, the upper part of the drive roller 12, is the document insertion part.As shown in FIG. It is covered by the insert stand 2A. Above the driving roller 12, the belt 1 with the driven roller 22 hooked around the driving roller 12 is placed.
4.As described below, it is installed so that it can be used on the side. The belt 14 that is hung around the driving roller 12 and the driven roller 22 are configured to engage on an extension line of the original insertion line of the original insertion table 2A, and the original detection switch 23 is disposed at the engagement position. , its actuator 23A protrudes into the document path. 32 is a document guide plate.

Furthermore, the document feeder 2 is configured such that a document stopper 24 can protrude downward from the reference side edge 11A of the document table 11, which is where the leading edge of the document should be located during exposure and which is located in the front when viewed in the feeding direction of the document.
It is set in. 25 is a solenoid for controlling this document stopper.

The document supply device 2 includes a control circuit 26, and the solenoids 21 and 25 described above, the document detection switch 23, the solenoid 31 described later, and the exposure end signal generating device in the exposure section of the copying machine main body 1 are connected to the control circuit 26, respectively. It is connected to the. 33 is a reference guide at another reference side edge adjacent to the reference side green 11A.

By rotating the drive roller 12 in the direction of the arrow shown in FIG. 2, the slack side of the feed belt 14 serves to feed the document.

The manuscript lectern glass 11 and the feed belt 14 are arranged so that there is a small distance between them, for example, about 0.2 lateral, but the manuscript is sufficiently fed by feeding the slack side of the feed belt 14. , Moreover, when the leading edge of the document hits the stopper 24, the feed belt 14 slides against the document, and the feed belt 1
4 rotates, the original may remain at the exposure position. In FIG. 4, the koji 22A of the driven roller 22 is movably mounted in a vertical hole 27 provided in the casing of the document feeding device, and is pivoted to one end of a lever 29 having a fulcrum 28. . The lever 29 is engaged with a retraction spring 30' that engages the casing at one end, and is rotated counterclockwise around the fulcrum 28, and a solenoid 31 is connected to the end of the lever 29. A plunger 31A is pivotally mounted. Solenoid 31 is connected to control circuit 26 shown in FIG. When the solenoid 31 is not energized, the driven roller 22
The driving roller 12 and the driven roller 22 are moved upward in the vertical hole 27 under the action of the driving roller 12 and the driven roller 22 are separated from each other. When the solenoid 31 is energized, the plunger 31A is retracted, and the driven roller 22 is moved downward in the vertical hole 27 via the lever 29 against the action of the spring 30, and the feed belt 14 hooked on the drive roller 12 is moved downward. come into contact with The operation mode of the document feeding device according to the present invention described above is as follows.

At the initial position, the actuator 23A of the document detection switch 23 protrudes into the document path, and the solenoids 21, 25,
31 is not energized, so the driven roller 22 is separated from the drive roller 12 as shown in FIG. and is not transmitted to the drive shaft 15.

In this state, the original with the image facing up is manually inserted from the original insertion table 2A into between the rollers 12 and 22 which are separated at this time. As a result, the leading edge of the document pushes the actuator 23A out of the document path, thereby activating the document detection switch 23. As a result, each solenoid 21, 25, 31 is energized via the control circuit 26, and the clutch 19 shown in FIG. begins to rotate in the direction of the arrow in Figure 2. At the same time, driven roller 2
2 descends and comes into contact with the feed belt 14, which is hooked on a drive roller, and applies a feeding action to the document between them, and the document stopper 24 further descends to assume the position shown in FIG. The document is reversed and guided by the document guide plate 32 and guided between the feed belt 14 and the document placement glass 11. In this case, since each feed belt 14 is arranged at an angle, the document to be fed is The document is fed obliquely over the calendar glass 11, and the green side of the document first contacts the reference guide 32, and positioning is performed on this side green. If paper is conveyed on both sides of the slanted part of the endless belt (upper running part and lower running part), the paper will return to the inserted position and the width adjustment effect will disappear, but the upper running part of the endless belt will Since the entire surface of the drive roller except for the upper part of the downstream drive roller, which is the insertion part, is covered by the insertion base 2A provided near the top surface, there is virtually no width-shifting action in the upper running part.
The required width adjustment is performed only on the downhill section. Then, the leading edge of the document hits the stopper 24, so that it is stopped at this position even if the feed belt 14 continues to rotate as described above.
In this way, the adjacent sides of the stopped document are positioned reliably and automatically. When the detection switch 23 detects the rear end of the document, the driven roller 22 is separated from the drive roller 12 via the control circuit 26 and the solenoid 31, as shown in FIG. Furthermore, the detection switch 23
When the leading edge of the document is detected, a timer device in the control circuit 26 is activated, and the solenoid 21 is activated after a predetermined period of time.
Since the energization of the clutch 19 is discontinued, the clutch 19 becomes disengaged.
Rotation of the feed belt 14 stops.

Next, a signal is sent from the timer device to the exposure section of the copying machine main body 1, and the exposure process is started. When the exposure process is completed, an exposure completion signal reaches the control circuit 26 from the exposure section, and the solenoid 25 is thereby deenergized and the stopper 2
4 retreats upward, the solenoid 21 is energized again, the feed belt 14 is rotated, and the document is sent forward onto the paper delivery tray 7. The document feeder is thus in an initial state in preparation for insertion of the next document. The original detecting switch 23 disposed at the belt position where the original is reversely fed in the above embodiment can be stopped, and the stopper 24 can be made to also serve as the original detecting switch instead.

At this time, the driven roller 22 is always in contact with the belt 14, and the belt 14 is also normally rotating.When the stopper 24 detects the leading edge of the document, the rotation of the belt is stopped, and the rotation is started again in response to the exposure end signal. Just do it. The timer device used in the embodiments of the invention described above may use a CR circuit or a mechanical cam.

In any case, these timer devices do not involve in positioning the document, so they do not need to be precise. The original document feeding device of the present invention can be attached to an existing copying machine as an attachment, and furthermore, in the case of originals of the same size and thickness, such as handprints, the document feeding device of the present invention can be automatically sorted from the stacked originals. An automatic separation and supply device for feeding sheets one by one can be attached.

In summary, the present invention uses a stopper to position the original without using a timer or the like.
The document is reliably and automatically positioned regardless of size, temperature, input voltage, etc.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a copying machine equipped with a document feeding device according to the present invention, FIG. 2 is a schematic sectional view of the Okaharabashi feeding device, and FIG. 3 is a copying machine with the insertion table omitted and the belt slantedly arranged. FIG. 4, a plan view of the device, is an explanatory diagram of the control mechanism of the driven roller. DESCRIPTION OF SYMBOLS 1...Copy machine body, 2...Document supply device, 2A...Insertion stand, 11...Manuscript counterfeit stand, 11A... ...Reference side green, 12... Drive roller, 14... Feed belt, 22... Driven roller, 23... Document detection switch, 24... Stopper, 33... ...Standard guide. Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1 The original feeder of a copying machine positions and places the original on the original placing table and exposes it.The original is inserted into the original with the image side facing upward, and the original is inverted and inserted into the original placing stand. It is attached to the endless belt that conveys the document upward and to the standard side edge position of the document placement table located in front of the document in the direction of document feeding.
In a document feeding device having a stopper that stops the document by abutting the leading edge of the document to be fed, the insertion table is placed near the upper surface of the upper running portion of the endless belt on the downstream side in the running direction of the upper running portion of the belt. The endless belt is arranged to cover the entire surface of the driving roller except for the upper part, and the endless belt is made up of a plurality of belts arranged parallel to each other and inclined with respect to the document feeding direction. A driven roller is provided above the drive roller on the downstream side in the running direction and engages with the belt on an extension line of the insertion line of the insertion base, and the side where the document approaches due to the inclined arrangement of the endless belt. and a reference guide mounted on a side edge of the document mounting table orthogonally adjacent to the reference side edge.