JPS6317732B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a paper feed device for cut and sheet paper in copying machines, printing machines, facsimile machines, and the like.

(Prior Art) As shown in FIG. 1 and FIG. 2, a conceptual front view and a left side view of this type of paper feeding device are shown in FIG. 1 and FIG. 2, respectively. A take-up belt 4 is attached to one end of the paper feed tray 3, and the take-up belt 4 is configured to be wound around a take-up shaft 6 via a guide roller 5, and the paper stack P is A paper feed roller 7 is pressed against the upper surface, and the paper is fed into a copying machine, printing machine, etc. one by one by rotation of the paper feed roller, and a joint 8 is attached to one end of the winding shaft 6. A motor 9 is attached through the paper feed tray 3, and as the number of sheets decreases, the rotation of the motor 9 rotates the take-up shaft and raises the paper feed tray 3.
It was common practice to maintain the horizontality of the paper feed tray by means of a horizontally maintaining wire 11, which is hung as shown in the figure. With this configuration, when the paper feeder 2 is pulled out in the direction of the arrow in FIG. 1 is pulled out, the paper stack P is refilled, the paper feeder 1 is inserted, and the motor 9 is rotated forward to raise the top surface of the paper stack P to the position where it comes into pressure contact with the paper feed roller 7. However, since such a paper feeding device requires an independent motor, it is not suitable in terms of manufacturing cost and power consumption. There were drawbacks, such as the time it took to lower the vehicle was so-called loss time. In addition, a worm gear and a worm wheel each having a built-in one-way clutch are attached to the belt winding shaft 6, and a pinion is provided that interlocks with the worm gear, which meshes with a rack provided parallel to the direction in which the outer box is pulled out. A paper feeding device was also proposed in which the paper feeding tray would fall down when the outer box was pulled out, regardless of the position of the paper feeding tray (Japanese Patent Application No. 57-66217).
However, after feeding the paper and inserting the outer box, the paper feed table is raised until the top surface of the paper reaches the required height, and the paper stack P is
However, when the top surface of the printer lowers, a dedicated motor is required to raise the paper feed tray to compensate for the lowering of the top surface.

(Object of the Invention) The present invention eliminates the drawbacks of the conventional paper feeding device, and
Without using a special drive device, the paper feed tray is lowered when the paper feeder is pulled out, and the paper feed tray is raised after replenishing paper, and the paper stack is raised as the paper is fed out. It is an object of the present invention to provide a paper feeding device that uses the driving force of a motor of a machine body to always maintain the upper surface in a proper position, and does not require a special motor.

(Structure of the Invention) The present invention provides a pinion that engages a winding shaft such as a wire or a belt for raising and lowering a sheet feeding table with a rack provided in parallel to the drawing direction of a sheet feeding device through an interlocking mechanism having a one-way clutch. When the paper feeding device is pulled out, the paper feeding tray is lowered and the driving force of the motor of the main body of the copying machine is intermittently transmitted to the winding shaft via the clutch. Therefore, by intermittently rotating the take-up shaft in the direction in which the paper feed table rises, the motor in a copying machine or the like can be saved, and the cost can be reduced.
The present invention provides a paper feeding device for copying machines and the like that consumes less power.

(Example) The present invention will be described in detail below based on an example shown in the drawings.

In the present invention as well, the paper feeder 1 is provided with an outer box 2 and a paper feed tray 3, and one end of the paper feed tray is suspended by an elevating wire 4, and the elevating wire is connected via a guide roller 5. The lifting wire 4 is wound up by the winding shaft 6, and the paper stack P
The paper feeding roller 7 is pressed against the top surface to send the paper to a copying machine, printing machine, etc., starting from the top sheet.When pulling out the paper feeding device 1, the joint 8 is removed, and after the paper feeding device is inserted, the joint 8 is removed. the rollers 10 and 1;
The structure is similar to that of the conventional paper feeding apparatus described above, in that the horizontal maintenance wire 11 is wound around the paper feeding table to maintain the horizontal level of the paper feeding table.

On the other hand, for convenience of explanation, the structure of the present invention will be explained first from the driving force transmission mechanism. FIG. 3 is a rear view showing the driving force transmission mechanism of the entire copying machine, and FIG. 4 is a side view showing the structure near the joint. However, within the copying machine 12, the driving force of the main motor 9 is transmitted via the chain 13 to each rotating part within the copying machine main body.
The driving force of the sprocket 16 is transmitted from one sprocket 14 driven by the chain to the take-up shaft driving sprocket 16 via another chain 15, and the driving force of the sprocket 16 is transmitted to the joint 8 via reduction gears 17, 17'. Configure it so that The driving force of the reduction gears 17, 17', which receives the driving force of the main motor 9, is transmitted toward and away from the joint 8 by means of an electromagnetic spring clutch 18, and the joint 8 is connected to the winding shaft 6. It is constructed so that it comes into contact with and separates from a joint provided at one end of the. Since the winding shaft 6 is pivotally supported by the paper feeder 1, the joint 8 is connected when the paper feeder 1 is inserted, and the joint 8 is released when the paper feeder is pulled out. Further, the electromagnetic spring clutch 18 is configured to be energized and excited by a signal issued from a detection device (not shown) until the upper surface of the paper stack P comes into pressure contact with the delivery roll 7.

Next, a mechanism for lowering the paper feed table when the paper feed device is pulled out will be described.

As shown in a perspective view in FIG. 5, a worm wheel 19 is pivotally connected to a winding shaft 6 which is pivotally supported on a paper feed tray, and a worm gear 20 that meshes with the winding shaft 6 is connected to a shaft 22 through a one-way clutch 21. is pivotally connected to the shaft 2
A pinion 23 is pivotally connected to one end of the pinion 2. On the other hand, a rack 24 is provided parallel to the drawing direction of the paper feeder, and the rack 24 and the pinion 23 are configured to mesh with each other. The one-way clutch 21 between the worm gear 20 and its shaft 22 operates when the winding shaft 6 is rotated in the direction of the arrow A in FIG. 5 and the pinion 23 is rotated in the direction of the arrow B in the same figure. When the worm wheel 19 and the worm gear 20 do not rotate, the driving force is transmitted so that when the pinion 23 is rotated in the direction of arrow C, the winding shaft 6 is rotated in the direction of arrow D in the figure. to be installed.

The present invention is configured as described above, and includes:
It works as follows.

Now, when the operator pulls out the paper feeder 1, loads the paper stack P, and inserts the paper feeder, the joint 8 is connected, and the upper surface of the paper stack P is pressed against the feed roller 7 as described above. The electromagnetic spring clutch 18 is energized and connected, and the lifting belt winding shaft 6 rotates in the direction of arrow A in FIG.
When the upper surface of the clutch 18 comes into pressure contact with the roll 7, the detection device de-energizes the clutch 18 and the lifting belt stops. Further, when the upper surface of the paper stack P is no longer in pressure contact with the paper feed roll 7 due to the paper being fed out from the paper feed roll 7, the clutch 18 is again excited by the above-mentioned structure, and the lifting belt winding shaft 6 is rotated. Since the paper feed tray is raised, the top surface of the paper stack P is always kept in pressure contact with the paper feed roll P.

However, even in this case, due to the action of the one-way clutch, the lifting belt winding shaft 6 is moved in the direction indicated by the arrow A.
This driving force is not transmitted to the pinion 23 even if it rotates in this direction.

Next, when the paper feeder 1 is pulled out, a pinion that engages with a rack provided parallel to the direction in which the paper feeder is pulled out rotates in the direction of arrow C, and the lifting belt winding shaft 6 rotates in the direction of arrow C.
is rotated in the direction of arrow D, so that the lifting belt 4
is loosened and the paper feed table 3 is lowered, so that paper can be loaded immediately. After loading the paper again, insert the paper feeder and the paper feed tray will rise as described above.
Repeat the above steps.

(Other Embodiments) It goes without saying that the present invention is not limited to the above-mentioned embodiments. For example, the paper feeding platform elevating belt may be replaced with a wire, or a wire may be used to transmit the driving force of the motor. Depending on the chain, the joint may be installed directly on another rotating part without the need for a special sprocket, and the motor used to obtain the driving force is not limited to the main motor, but may be another motor. However, it goes without saying that there is no need to use a dedicated motor for rotating the lifting belt rotating shaft.

(Effects of the Invention) Since the present invention is configured and operates as described above, a special motor is not required to raise the paper feed tray when paper is loaded on the paper feed tray and the paper feed device is inserted. I don't. This is particularly important when it comes to the configuration of copying machines, as well as simply reducing manufacturing costs.Copying machines usually use a 100V power supply, so the power consumption of the entire copying machine should be kept as low as possible. However, copying machines have heating devices and other mechanisms that consume a large amount of power, and are subject to severe design constraints. This allows for a very flexible design in terms of the aircraft configuration.

In addition, when the paper feeder is pulled out, the paper feed table is lowered, so paper can be loaded immediately, eliminating loss time, etc.
The effect of the invention of No. 1 is not lost.

[Brief explanation of the drawing]

Fig. 1 is a conceptual front view of a conventional paper feeding device, Fig. 2 is a left side view thereof, Fig. 3 is a rear view showing the driving force transmission mechanism of the entire copying machine, Fig. 4 is a side view of the vicinity of the joint, FIG. 5 is a perspective view of the paper feed tray elevating mechanism. In the figure, 1...paper feeder, 4...lifting belt, 6
... Winding shaft, 8 ... Joint, 9 ... Main motor,
12... Drive chain of the copying machine main body, 17,1
7'... Reduction gear, 18... Electromagnetic spring clutch, 21... One-way clutch, 23... Pinion, 24... Rack.

Claims (1)

[Claims] 1. A winding shaft 6 such as a wire or belt 4 for raising and lowering the paper feed table, which is pivotally supported by the paper feed device 1, is arranged parallel to the drawing direction of the paper feed device 1 via an interlocking mechanism having a one-way clutch 21. In a paper feeder configured such that the paper feed tray 3 is lowered when the paper feeder 1 is pulled out by interlocking the pinion 23 that meshes with the rack 24, the motor 9 of the main body of a copying machine or the like is driven. By intermittently transmitting force to the winding shaft 6 through the clutch 18, the clutch 18 is caused to intermittently rotate the winding shaft 6 in the direction in which the paper feed table 3 is raised. A paper feeding device for a copying machine, etc.