JPS61206750A - Form feeding device for printed image recording device - Google Patents

Abstract

PURPOSE:To prevent overlapping in form feeding positively by configurating a device in such a way that a form path for hand feeding is interrupted when cassette form feeding is selected, while on the contrary, a form path gate is provided so as to allow it to be relaesed when hand feeding is selected. CONSTITUTION:An interruption gate 80 is arranged between a hand feeding roller 50 and a hand feeding inlet. In case of a hand feeding mode, the interruption gate 80 is opened, a form path for hand feeding is released allowing hand feed detecting switch 40 to be operable. Then, when hand feeding is detected by the switch 40, a drive motor is started so as to rotate the hand feeding roller 50 allowing hand feeding to be effected. And in case of a cassette feeding mode, the path for hand feeding is interrupted by the gate 80 allowing the switch 40 to be inoperable.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an image forming apparatus, and particularly to a paper feeding device suitable for manually feeding paper into an output terminal device such as a computer.

[Background of the invention]

Paper feeding devices for general image recording apparatuses can be roughly divided into two types: cassette feeding using a cassette filled with paper, and manual feeding in which paper is fed one by one by an operator. A typical example is a copying machine.

The configuration of an image recording device f#, 1 such as a copying machine is shown in FIGS. 7 and 8. During cassette paper feeding, the paper in the cassette is automatically fed one by one by the paper feeding roller 20. On the other hand, when manually feeding paper, the drive motor (
There is a manual feed roller 5o that constantly rotates when the paper is rotated (not shown). Do paper. For both cassette paper feeding and manual paper feeding, the main controller 10 performs timing control using the paper feeding detection switch 25, and registers the paper feeding roller 3o. In such a device, an operator must be present at the image recording device (that is, a stand-alone type device), and the operator operates the operation panel 15 to instruct the main controller 1o to start. Therefore, it is impossible to manually feed paper while feeding paper from the cassette. However, if such an operation were to be performed, with the above configuration, cassette paper feeding and manual paper feeding would be performed at the same time, resulting in registration of two sheets of paper, resulting in double feeding. I end up. This kind of operation is unthinkable for a stand-alone type device, but for example, in the case of an image recording device as a terminal device connected to a computer, etc., it is necessary for the computer operator to perform operations near the image recording device. Because of the lack of communication among operators, there is a high possibility that an operator near the image recording device will manually feed paper when the computer is booting the computer to feed paper from a cassette. It is.

In order to solve the above-mentioned problems, an image recording device 2 as a terminal device such as a computer is shown in FIGS. 9 and 10.

By replacing the manual feed roller 250, which is always rotating in the case of a copying machine, with a manual paper feed roller 60 configured to be able to stop according to instructions from the main control circuit 10, instructions are not required from the host 5 such as a computer. The main controller 10 controls the manual paper feed roller 60 so that the paper is fed from the cartridge set only, and manual paper feed is enabled only when instructed by the host 5.
By enabling rotation of the paper feed roller 20 and prohibiting rotation of the paper feed roller 20, double feeding is reliably prevented.

However, in the image recording apparatus 2 having such a configuration, the configuration of the manual paper feed row 260 has a complicated drive system configuration (for example, a magnetic clutch), resulting in an increase in size, which is disadvantageous in terms of cost. There were some problems.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a manual sheet feeding device for an image recording apparatus that has a simplified configuration for completely preventing double feeding as described above.

[Summary of the invention]

In the present invention, a shielding means for preventing the insertion of manually fed paper is provided before the constantly rotating manual feeding roller, and a manual feeding detection switch is also used as the shielding means.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1, 2, 3, 4, and 5.

Fig. 1 is a block diagram of an embodiment of the present invention, Fig. 2 is a control block diagram, Fig. 3 is a block diagram of the manual feed detection switch section, Fig. 4 is a timing chart, and Fig. 5 is a flow chart. be.

The image recording device 2 is a terminal device connected to a host 5 such as a computer. One of the control signals from the host 5 indicates I! 11b Paper feeding mode signal 101 causes the main controller 10 in the image recording apparatus 2 to selectively control the cassette paper feeding mode and the manual paper feeding mode.

In addition, the main controller 10 receives the print request signal 100.
starts image recording.

When activated, the manual feed detection switch 40 is moved by first determining which paper feed mode is selected and turning on the switch release solenoid 70 that fixes the manual feed detection switch 40 when the manual feed mode is selected. (escape)
Allow. Thereafter, when the manual feed detection switch 40 detects that the operator has manually inserted the paper, the drive motor is started, the manual feed is performed by the manual feed roller 50, and the paper feed roller 30 completes registration.

Note that during this time, the operation of the paper feed roller 20 is prohibited by the main controller 1°, so double feeding never occurs in the paper feed section.

On the other hand, when the cassette paper feed mode is activated at startup, the switch release solenoid 70 described above remains in the OFF state, meaning that the manual feed detection switch 40 cannot be moved, even if an attempt is made to insert paper from the manual feed. The ingress of paper is blocked, and in this case too, double feeding in the paper feed section never occurs.

In addition, switch release solenoid 7 in manual paper feed mode
For example, the off timing of the manual feed detection switch 40, the pick, the trailing edge of the manually fed paper, etc. can be used as the off timing for the next paper to be blocked.

According to this embodiment, double feeding in the paper feed section can be prevented by simply adding an inexpensive and small solenoid to make it impossible to move the manual feed detection switch 40 in order to block the entry of paper. This is advantageous in terms of device size reduction and cost.

Another embodiment of the invention is shown in FIG.

In this embodiment, a shielding gate 80 is provided between the manual feed roller 50 and the manual feed insertion slot. The operation timing in this case is the same as in the previous embodiment.

According to this embodiment, it goes without saying that double feeding in the paper feed section can be prevented.Furthermore, in the previous embodiment, shielding was performed at a point, but in this embodiment, shielding is performed at a surface, so that the manual feed slot It is possible to prevent small pieces of paper from being inserted through the gap etc. between the manual feed detection switch 40 and the manual feed detection switch 40, and the effect of preventing double feeding can be further enhanced.

〔Effect of the invention〕

According to the present invention, it is possible to accurately cover and release manually inserted paper according to an instruction from the host in a compact and inexpensive manner, and it is possible to completely prevent double feeding in the paper feed section.

[Brief explanation of drawings]

FIG. 1 is a block diagram of the image recording apparatus according to the present invention, FIG. 2 is a control block diagram, FIG. 3 is a block diagram of the manual insertion detection switch section, FIG. 4 is a timing chart, FIG. 5 is a flow chart, and FIG. Figure 7 is a configuration diagram of another embodiment of the present invention.
Figures 8 and 9 are configuration diagrams of conventional devices, Figures 8 and 1.
Figure 0 is a control block diagram. 2... Image recording device, 5... Host, 1o... Main controller, 15... Operation panel, 2o... Paper feed roller, 25... Paper feed detection switch, 3o... Paper feed roller, 40... Manual feed detection switch, 5o... Manual feed roller, 6°... Manual feed roller, 7o... Switch release solenoid, 80... Shielding gate.

Claims (1)

[Scope of Claims] 1. Main control means for receiving a print request signal from a host such as a computer, main body driving means controlled by the main control means, and transmission of driving force from the main body driving means /A cassette paper feed section having a paper feed roller whose non-transmission is controlled by the main control means, and a manual paper feed section having a manual paper feed roller and a manual paper insertion slot that are constantly driven by the main control means. In the image recording apparatus, when the main controller selects the cassette paper feed section in response to the paper feed section selection signal from the host described above, the manual feed slot and the manual feed roller 1. A paper feeding device for an image recording apparatus, characterized in that a passage gate is provided for blocking a manual paper passage between the parts and opening the paper passage when a manual paper feeding section is selected. 2. A paper feeding device for an image recording apparatus according to claim 1, characterized in that a manual paper feed detection means is provided in the above-mentioned manual paper passage, and the manual paper feed detection means is also used as the above-mentioned passage gate. 3. The image according to claim 1, wherein the passage gate is opened when the paper feed unit control signal selects the manual paper feed unit and a print request signal is received. Paper feed device of recording device. 4. A paper feeding device for an image recording apparatus according to claim 2, wherein the manual paper feed detection means is released as a passage gate and then blocks the manual paper passage again at the time when the paper passes through.