JPS602545A - Paper transfer position control device - Google Patents

Abstract

PURPOSE:To greatly widen the allowable time for the dispersion of a transferring time just before a paper registration section, by attaching gates onto a long endless belt laid between pulleys so that a paper is moved along the conveying path over a long distance. CONSTITUTION:When a solenoid 14 which receives a signal from a controller is energized, power is transmitted to a shaft 9 so that belt 3 travels round between pulleys 4, 5 at a predetermined speed, and as well gates 6, 7 initiate to move in association with this travel so that the gate 7 comes up above the pulley 5. Meanwhile a paper 18 is transferred onto the belt 3 under conveying force by a slip roll 1 and a drive roll 2, and catches up to the gate 6 so that it is transferred at the transferring speed of the belt 3. At this time, the dispersion of the travelling time until then is corrected due to that the allowable time is greatly widened.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a paper conveyance position control device in a paper device such as a copying machine.

(Prior art) Conventionally, this type of paper conveyance position control device has either arranged a registration gate at a suitable position on the paper conveyance path so that it can be driven intermittently using a solenoid, or arranged the registration gate/roll so that it can be driven intermittently. By setting the speed immediately before the gate or roll to be faster, the variation in the conveyance time of the paper conveyed just before the gate or roll is reduced, and the paper is It is configured to widen the allowable time for variations in conveyance time, thereby making the conveyance time between sheets constant, and at the same time correcting the oblique conveyance state of the sheets.

However, in a paper position control device having such a configuration,
When paper is transported at high speed, the speed difference between the paper transport speed and the intermittent drive of the gate or roll becomes large. It has the drawback that it is easily damaged by collision with the roll, and this can cause paper jams and the like.

(Object of the Invention) The present invention has been made in order to eliminate the drawbacks of the conventional paper conveyance position control device, in which the registration gate or roll IDK and the long endless belt are arranged via pulleys. By attaching a gate to the belt and moving the paper over a long distance along the paper conveyance path, the allowable time for variations in the conveyance time of the paper to just before the registration section is widened, and the paper It is an object of the present invention to provide a paper conveyance position control device that extends jam detection time and reduces the incidence of paper jams.

(Structure of the Invention) The present invention will be described in detail below based on embodiments shown in the drawings.

1 and 2 are a partially cutaway side view and a plan view showing an embodiment of the paper conveyance position control device of the present invention.

A long endless rotary belt 3 is installed at the bottom of both ends of the conveyance path behind the pair of upper and lower slip rolls 1 and drive rolls 2 which are placed at appropriate positions on the paper conveyance path using belts IJ-4 and 5. The gates 6 and 7 are arranged along the paper conveyance direction, and gates 6 and 7 are attached to the outer periphery of the belt 3 every half circumference. The gate 6.7 is erected using a spring or the like so that it can be folded as necessary when passing between the conveyor rolls 8 disposed on the pulley 4. A shielding plate 10 is attached to one end of the shaft 9 on the side of the pulley 5, and a photo-interrupter 11 is arranged around one circumference of the shielding plate 109, and the other end of the shaft 9 is not shown. A spring clutch 13 is provided in order to make the shaft 9 rotate intermittently by the gear 12, and a gear that receives the driving force from the motor to raise the shaft 9. The rod 15 is connected, and the solenoid 14 is operated by a controller (not shown) that detects that the light receiving section of the photointerrupter 11 is blocked from light due to the rotation of the shaft 9 and uses the detection signal. The time required for the paper to be corrected by this intermittent motion is set in advance during which the paper travels on the belt 3 at a transport speed of Vo along the paper transport path until it reaches between the slip roll 1 and the drive roll 2. If the speed is Vl and the distance is t, the stop position of the gate 6.7 may be controlled by setting the length of the belt 3 to an integral multiple of the circumferential length of the pulley 5 based on t-the above formula.

In the figure, reference numerals 16 and 17 indicate frames respectively provided on the outside of the pulley 40.5.

The present invention is constructed as described above. Next, its operation will be explained.

As shown in FIG. 3(a), 7 of the gates 6.7 is at the home position and is waiting for the paper 18 to be conveyed by the slip roll 1 and the drive roll 2. Next, as shown in FIG. 3(b), a signal is emitted from the controller (not shown) and the solenoid 14 is turned on, power is connected to the shaft 9 and the belt 3 is set in the range between +) - 4% and 5. Start circling at the set speed.

Along with this, the gates 6 and 7 also begin to move, and the gates 7 rise above the pulley 5. In contrast, paper 18
is conveyed onto the belt 3 by the conveyance force of the slip roll 1 and the drive roll 2 as shown in FIG. 3(C), catches up with the gate 6, and is conveyed at the conveyance speed of the belt 3. At this time, variations in the transport time up to that point are corrected by widening the allowable time. And Figure 3 (
As shown in d), it is carried out by the conveyor roll 8 above the pulley 4.

(Effects of the Invention) As described above, the present invention moves the gate 6 or 7 by the belt 3 to increase the permissible time for variations in the conveyance time of the paper 18 until just before registration. Since there is no need to increase the transport speed of the paper, even during high-speed transport, damage to the paper at this location can be reduced to the same level as with a medium-speed machine, and by extending the moving distance of one gate 6 or 7, paper slippage during transport can be reduced. Since the tolerance value for time delays caused by such factors is increased, the occurrence rate of paper jams due to misfeed from the feeder to the registration lane section can also be reduced.

It should be noted that there is no reason why the present invention must be limited to the above-mentioned embodiments, and for example, gates 6 or 7 provided on the belt 3 may be used.
i-1: If this is made of an elastic member, the bending of the transport roll 8 section and the restoration after passing through this point can be done without using a tin ring or the like as described above, and the shaft 9 can be driven intermittently. In addition to the above-mentioned spring clutch, a conical clutch, a dog clutch, a rim clutch, etc. may be used as the clutch mechanism for stopping the rotation.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view showing one embodiment of the paper conveyance position control device of the present invention, FIG. 2 is a plan view of the same, and FIG. 3 is the same,
FIG. 3 is a side view showing the conveyance state of the paper. [In ffl 1: Slip roll, 2: Dry roll, 3: $ belt, 4.5: Pulley-16, 7-e Rogate, 8: Transport roll, 9
...shaft, 10.@...shielding plate, 11-@...
Photo interrupter,・12・0・・Gear, 13・−
・Spring clutch-14...Threnoid, 15
...Operation lever. Patent applicant Fuji Xerox Co., Ltd. = 2 Figure 3

Claims (1)

[Claims] A pair of upper and lower slip rolls and a drive roll are placed at appropriate positions on the paper conveyance path, and an endlessly rotating belt pulley is placed at the bottom of the rear part of the drive roll in the paper conveyance direction, and a gate is installed at an appropriate position on the belt. By providing an appropriate number of belts and enabling the belt to be driven intermittently, it is possible to widen the allowable time for variations in the conveyance time until just before the registration of the paper during paper conveyance, thereby preventing the occurrence of paper jams, etc. Featured paper transport position control device.