JPH02158547A - Picture recorder - Google Patents

Abstract

PURPOSE:To eliminate a jam of paper caused by its position displacement by providing a position alignment control means for delaying an operating speed of a sheet restricting member before it reaches a position alignment position corresponding to sheet size. CONSTITUTION:A position alignment control means controls a pulse motor 6 to be driven moving a movable side plate 2, serving as a sheet restricting member, at a high speed from a home position to a set position. Next, this movable side plate 2 is moved at a low speed from this set position to a resist position (position alignment position corresponding to sheet size). Thus enabling paper to be accurately positioned in a predetermined position, a jam of paper caused by its position displacement can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image recording apparatus having a sheet positioning mechanism, and particularly to an image recording apparatus having a positioning mechanism that is accurate during high-speed recording operation.

[Prior Art] Conventionally, an image recording apparatus has been used as an image recording apparatus equipped with a positioning mechanism (hereinafter referred to as a "registration mechanism") that adjusts the paper position by moving and adjusting the paper as a sheet sent from a feeding means in the transport width direction. There is something like the one shown in Figure 6. When the paper 103 is sent from the feeding means, a sensor (not shown) detects the paper size and drives the oblique feed roller 110 and the motor 106 at a predetermined timing. This motor 106 feeds the movable side plate 102 as a sheet regulating member to the alignment position (hereinafter referred to as registration position) according to the paper size, and the oblique feed roller NO moves the paper 103 into the guide groove 105 formed on this movable side plate 102.
Convey the paper while pressing the edges of the paper. That is,
In this device, the positioning of sheet conveyance is performed by a movable side plate 102 that is sent out to a registration position by the drive of a motor 106.

Incidentally, in recent years, image recording apparatuses are required to operate at high speed, and in such image recording apparatuses, paper 10
The conveyance speed of the paper sheets 103 is fast, and furthermore, the conveyance interval between the sheets of paper 103 that are conveyed is short. Therefore, in an image recording apparatus having a high-speed recording operation, it is necessary to perform the positioning operation at high speed.
The movable side plate 102, which aligns the paper 103 in conjunction with the rotation of the paper 103, must also be operated at high speed.

[Problems to be Solved by the Invention] However, in the conventional registration mechanism described above, as the movement of the movable side plate +02 becomes faster, the force with which the movable side plate 2 pushes out the paper 103 increases, and this force acts as a guide for the movable side plate 102. If the force of the skew feed roller 110 that presses the paper 103 against the groove 105 is greater than the force of the paper 103, the paper 10
3 cannot be accurately aligned, and the image to be recorded on the paper 103 may be recorded out of alignment. Further, there is a problem in that such misalignment of the paper 103 may cause the paper 103 to become clogged.

The present invention has been made to solve the problems of the prior art described above, and its purpose is to provide a positioning mechanism that can accurately position paper even when performing high-speed recording operations. An object of the present invention is to provide an image recording device.

[Means for Solving the Problems] In order to achieve the above object, in the present invention, when a sheet fed from a feeding means is conveyed to an image recording means, the sheet regulating member is moved in the conveying width direction. In an image recording apparatus equipped with an alignment mechanism that adjusts the movement of the sheet and adjusts the sheet position by movement, the alignment mechanism includes alignment control means that moves the sheet regulating member at a plurality of operating speeds. The positioning control means is configured to perform control to slow down the operating speed of the sheet regulating member before the sheet regulating member reaches the positioning position corresponding to the sheet size.

[Function] In the present invention having the above configuration, the operation speed of the registration mechanism by the alignment control means (hereinafter referred to as registration control means) is controlled until it reaches a predetermined position (hereinafter referred to as set position) before the registration position. By performing this at a predetermined speed and then lowering the speed to a slower speed than the predetermined speed, the paper can be reliably aligned.

[Embodiment] An embodiment of the present invention is shown in FIGS. 1 to 4, and its configuration will be explained using FIG. 1.

Reference numeral 1 denotes a frame of the registration mechanism, which is disposed between the feeding means and the image recording means. Reference numeral 2 designates a movable side plate serving as a sheet regulating member for positioning the paper 3 as a sheet, and a guide piece 4 for guiding the paper 3 is formed in the downstream conveyance direction, and the edge of the paper abuts. A guide groove 5 is formed for conveyance. moreover,
A rack gear 8 is extended and formed on the movable side plate 2 for converting the rotational movement of a binion gear 7 attached to the rotating shaft of the pulse motor 6 into movement in the transport width direction.
An L-shaped protrusion is formed at the end of the rack gear 8. 1o is a diagonal feed roller that conveys the paper 3 in an oblique direction so as to contact the guide groove 5 of the movable side plate 2. Reference numeral 11 denotes a pulse motor driver for driving the pulse motor 6, and a home position sensor 12 for detecting contact with the end of the protrusion 9 formed on the movable side plate 2 is also connected thereto. A paper sensor 13 detects that the paper 3 is conveyed into the registration mechanism.

An example of the operation of the mechanism in the above configuration will be described below with reference to FIGS. 1 and 4.

First, when the paper sensor 13 is not detecting the paper 3, the pulse motor 6 rotates in the direction of arrow C in FIG. Move in the direction of arrow d and stop. (The position of the movable side plate 2 in this state is hereinafter referred to as the home position.) Then, when the paper 3 is conveyed to the registration mechanism, the paper sensor 13 detects this, rotates the oblique feed roller lO at a predetermined timing, and 3 in the direction of arrow a. Furthermore, the registration control means 14 sends a signal to the pulse motor driver 11 at a timing earlier than the rotation of the oblique feed roller IO, and rotates the pulse motor 6 in the direction indicated by the arrow, thereby moving the movable side plate 2 in the direction indicated by the arrow e. . That is, the paper 3 conveyed by the oblique feed roller 1O is guided by the guide piece of the movable side plate 2, and its end portion abuts against the guide groove 5 for positioning.

Next, the configuration of the control system of the registration mechanism will be explained using the block diagram shown in FIG. 2.

20.21 is a 1-chip microcomputer (hereinafter referred to as CPU) with built-in RAM and ROM;
0 is the main CPU that controls the entire image recording device.
21 is a sub CPU that manages the registration control means 14; 22 is a driver for the main motor M that feeds the paper 3, and 23 is a solenoid driver that drives a solenoid SL that transmits the rotational force from the main motor M+ to the oblique feed roller IO. 24 is a paper size detection means, and when the information is sent to the main CPU 20, the information is immediately transmitted to the sub CPU 21, and the sub CPU 21 sends a signal to the main motor driver 22 to start the main motor M+.
starts driving.

The states of each signal in the control system will be explained using the timing chart shown in FIG.

First, when the paper sensor 13 detects the paper 3, the information is sent to the main CPU 20.
0 to the sub CPU 21. Sub CPU21
sends a signal to the pulse motor driver 11 at time 1+ after the paper sensor 13 detects paper 3, and at time tz
Afterwards, a signal is sent to the solenoid driver 23. That is, the pulse motor 6 is driven after a time t1 from the detection of the paper 3, and the oblique feed roller IO is driven after a time tz. At this time, the relationship between time t and time t2 is t+<ta, and the relationship including time t for the movable side plate 2 to reach from the home position to the registration position is t<tz <t.
I+t3. The excitation signal used to drive the pulse motor 6 is as shown in Figure 3 (■) from the home position to the set position to quickly move the movable side plate 2 by increasing the driving frequency, and from the set position to the registration position as shown in Figure 3. As shown in (2), the movable side plate 2 is moved by lowering the driving frequency. Then, in order to quickly return the movable side plate 2 to the home position as soon as the paper sensor 13 no longer detects the paper 3, the drive frequency is increased as shown in Fig. The movable side plate 2 is moved by excitation so that the movable side plate 2 is moved. The moving distance of the movable side plate 2 in this registration mechanism varies depending on the size of the paper 3, but by keeping the excitation time in the state shown in Fig. 3 constant and varying the state shown in Fig. 3, the speed of operation can be increased. There is.

Another embodiment will be described using FIG. 5.

The registration mechanism in this embodiment is a modification of the control of the pulse motor in the above embodiment, in which the pulse motor 6 is excited so as to gradually slow down the operating speed from the set position to the registration position.

Therefore, since the movable side plate 2 can be moved smoothly, damage to the gear due to sudden speed changes can be prevented.

Although a pulse motor is used in this embodiment, even when a DC motor is used, the same method as in the above embodiment can be implemented by controlling the phase current and controlling the speed. Alternatively, the moving speed of the movable side plate may be changed by keeping the speed of the motor constant and changing the gear ratio.

[Effects of the Invention] As explained above, in the present invention, by moving the movable side plate at high speed to a predetermined position corresponding to the sheet size, it is possible to correspond to an image recording apparatus having a high-speed recording operation. After that, by performing a slow operation up to the alignment position, the paper will not be erroneously thrown away. Therefore, an image is not recorded on the paper with a misalignment, and paper clogging due to misalignment of the paper does not occur.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of main parts showing an embodiment of the present invention, FIG. 2 is a block diagram showing a control system of the embodiment, FIG. 3 is a timing chart showing control signals of the embodiment, and FIG. FIG. 5 is a timing chart showing control signals of another embodiment, and FIG. 6 is a schematic diagram of the main part of a conventional example. Explanation of symbols 1... Frame 2... Movable side (sheet regulating member) 3... Paper (sheet) 4... Guide piece 5...
Guide groove 6...Pulse motor 7...Binion gear 8...Rack gear 9...Protrusion
IO...Diagonal feed roller 11...Pulse motor driver 12...Home position sensor 13...Paper sensor 14...Positioning control means 20...Main CPU 21...Sub CPU 2
2... Main motor driver 23... Solenoid driver 24... Paper size detection means Fig. 2 Fig. 3 Fig. 4 Fig. 6

Claims (1)

[Claims] When a sheet fed from the feeding means is conveyed to the image recording means, a position where the movement of the sheet is adjusted by moving the sheet regulating member in the conveying width direction and the sheet position is adjusted. In an image recording apparatus equipped with an alignment mechanism, the alignment mechanism includes alignment control means for moving the sheet regulating member at a plurality of operating speeds, and the alignment control means moves the sheet regulating member according to the sheet size. An image recording apparatus characterized by performing control to slow down the operating speed of the sheet regulating member before reaching the alignment position.