JPH02137332U - - Google Patents

Description

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram showing the state in which the mass paper feed device according to this invention is installed in a copying machine, Fig. 2 is an external perspective view showing the entire copying machine equipped with the mass paper feed device, and Fig. 3 is a Lifting device 2 of mass paper feeder
1 and its related parts; FIG. 4 is a schematic perspective view of the mass paper feeder as seen from the rear side with the outer cover removed; and FIG. 5 is a side view of the copying machine related to the mass paper feeder. FIG. 6 is a perspective view showing the upper limit sensor for stopping the paper feed tray at the upper limit paper feed position and its surroundings; FIG. 6 is a block diagram showing the control unit that controls the lifting device 21 and its related configuration; FIG. is a flowchart showing an example of a subroutine for controlling the lifting device according to the selection of the home position by the control unit shown in FIG. 6, and FIGS. Figures 11 and 12 are explanatory diagrams showing the states in which paper can be fed at different positions.
FIG. 13 is a perspective view similar to FIG. 4 showing another embodiment of the large-volume paper feeder according to this invention; FIG. Similarly, a block diagram showing a control section that controls the lifting device and its related configuration, FIGS. 15 to 17 are flowcharts showing judgment and processing executed by the control section 50 in FIG. 14, and FIG. 18 is a flowchart showing the paper feeding FIG. 19 is an explanatory diagram showing the state when the paper on the tray 22 runs out, and FIG. 19 is a schematic configuration diagram showing an example of a conventional large-volume paper feeding device. 10... Copying machine, 11... Paper feeding section, 13A-1
3C... Home position selection button, 20, 60...
...Mass paper feed device, 21... Lifting device, 22... Paper feed tray, 22a... Paper placement surface, 23A-23
C...Sensor, 31...Motor, 37...Pressure sensor, 38...Upper limit sensor, 47...Paper end sensor, 49...Memory update button, 50...Control unit, P...Paper (transfer paper) .

Claims (1)

[Scope of Claim for Utility Model Registration] 1. In a large-volume paper feeder that is connected to a paper feeder of a copying machine, etc. and is capable of feeding a large amount of paper placed on a paper feed tray that is raised and lowered by an elevating device. , a plurality of sensors for detecting the position of the paper feed tray are arranged at intervals along the vertical direction of the paper feed tray, and any one of the plurality of sensors is arranged to detect the position of the paper feed tray. A home position selection button is provided for selecting a home position sensor for stopping the paper feed tray, and when the sensor selected as the home position sensor detects the paper feed tray when the paper feed tray is lowered. A large-volume sheet feeding apparatus characterized in that a lifting device control means is provided for controlling the lifting device so as to stop the lifting device. 2. The mass paper feeding device according to claim 1, further comprising: a pressure sensor that outputs a signal according to the weight of the paper on a paper placement surface on which the paper of the paper feed tray is placed; storing the sensor corresponding to the highest home position that allows a number of sheets of paper to be placed on the paper feed tray in accordance with a signal from the pressure sensor when the paper is in the paper feed tray;
A large-volume sheet feeding apparatus characterized in that a home position automatic selection means is provided for selecting the stored sensor as a home position sensor if the home position selection button is not operated until the storage is canceled. .