JPS58106564A - Paper feed controlling method of image recording device - Google Patents

Abstract

PURPOSE:To shorten the time requiref for carrying paper, by providing a detecting means for detecting the paper which arrives in order in front of a resist roller, and controlling the driving of the resist roller and the driving of a carrying and paper feeding means in connection with each other. CONSTITUTION:The tip of the first sheet of paper S in a tray 13, which is fed out at prescribed intervals in order by a paper feed roll 130 and a pair of carrying rollers 11, 12 is detected by a sensor 10. This time point and the time point when the paper reaches a resist roller 9 from relation of a paper feed speed are set, and when the first paper is brough into abutment on the resist roller 9, the carrying rollers 11, 12 and the roll 130 are stopped. Subsequently, by an image synchronizing signal, the resist roller 9 starts its driving, and simultaneously, the carrying and paper feeding means is alos driven. In this way, the paper S is fed out in order at prescribed intervals onto the carrying path, therefore, the time required for carrying the paper can be shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paper feed control method for an image recording apparatus.

Image recording apparatuses to which the present invention is applied include well-known electrophotographic apparatuses, laser plotters, and other dot-type recording apparatuses (not only direct recording apparatuses), but also other image recording apparatuses that use pre-cut paper to record images. Broadly encompasses recording devices.

By the way, in these image recording devices, paper placed on a paper feed tray is fed out by a paper feeding roller, this fed out paper is conveyed by a conveyance roller on a conveyance path, and on the way, the paper is conveyed by a registration roller. Conventionally, in paper feeding means that is set to continue conveying toward the transfer unit after adjusting the feeding condition, the next paper is placed on the paper feed tray after the preceding paper has passed through the transfer unit. The paper is fed by starting the machine further away.

However, especially in an image recording apparatus with a long conveyance path, it takes time for the paper to reach the transfer section, which is an obstacle to improving the recording speed.

The present invention was developed in view of the above circumstances, and is capable of reducing the time spent transporting paper.
An object of the present invention is to provide a paper feed control method for an image recording device.

The present invention will be explained in detail below.

The present invention reduces the substantial paper feeding time by allowing multiple sheets of paper to exist continuously on the conveyance path.

That is, the present invention provides a paper feed roller control means for controlling one drive of the paper feed roller in the J pivot system of the paper feed roller, a conveyance roller control means for controlling the drive of the conveyance roller in the drive system of the conveyance roller. A paper detection means for detecting the arrival of paper is provided at a position in front of the registration roller, and when the leading edge of the paper being conveyed reaches the registration roller, the paper feed roller in the paper feeding state and the paper feeding roller in the paper feeding state are provided. After stopping the driving of the registration roller, and after the registration by the registration roller is completed, the registration roller and the conveyance roller are driven by the image synchronization signal, and at the same time,
This purpose is achieved by transporting the paper by driving the paper feed roller in the paper feeding state.

The first embodiment will be described with reference to the drawings.
In the figure, reference numeral 1 indicates a drum carrying toner 1, and around this drum 1 are located various ring processing units necessary for image formation. Space portion 6 between the transfer charger 2 and the drum surface in the above various process sections
is a transfer portion, and the space between the adjacent separation charger 6 and the drum surface is a separation portion. After the toner image on the drum is transferred, the paper separated from the drum 1 is conveyed by a conveyor belt 4 to the next processing section, such as a fixing section. Incidentally, reference numeral 5 indicates a separation claw that has the function of separating paper from the drum 1. Further, other process sections arranged around the drum 1 include a charging section, an exposure section, a developing section, a static eliminating section, a cleaning section, and the like.

Examples of the exposure method include slit exposure using electrophotography, dot matrix image exposure using laser beam scanning, and the like.

A guide plate 7 is arranged near the transfer part B with the opening facing the core part! has been done. A pair of feed rollers 8 are arranged in the middle of this guide plate 7. The feed roller 8 is constantly rotating in a direction to feed the paper to the transfer section 6 from the time the power of the image recording apparatus is turned on.

A pair of registration rollers 9 are arranged upstream of the feed roller 8. The registration rollers 9 have a function of adjusting skewed paper feeding, etc., and are driven intermittently. The drive system is connected to a power source via, for example, a clutch, and the drive is turned on and off by on/off control of the clutch. Paper sent from downstream is
The registration roller 9 stops rotating when it hits the registration roller 9 and is registered, and after the paper is in the correct feeding position, it starts to be driven by a predetermined image synchronization signal. The paper is sent out toward roller 8. The amount of paper fed by the drive of the registration rollers 9 is sufficient until the leading edge of the paper is caught by the feeding rollers 8. When the feeding rollers 8 begin to feed the paper, the registration rollers 9 will be able to detect the amount of paper remaining. During this time, the paper is pulled by the feed rollers 8 and rotates with the paper.In this sense, a one-way clutch is used as drive control means for the registration rollers 9.

A sensor 10 serving as a paper detection means is provided near the registration roller 9 and at an upstream position thereof.

The sensor 10 consists of a pair of a light emitting section 10a and a light receiving section 10.

The conveyance path (upstream of the sensor 10) branches in two directions.

One is a conveyance roller 1112 each consisting of a pair of rollers.
etc., to form a conveyance path leading to paper feed tray 1, and the other side is formed by a pair of conveyance rollers 14 and 15, each consisting of a pair as described above.
．． 16, etc., to form a conveyance path that reaches the paper feed tray 17.

Paper S is placed on each of the paper feed trays 15 and 17, and the topmost paper has paper feed rollers +50 and 17 for feeding out the paper.
0 are set to come into contact with each other as necessary.
The paper on the paper feed tray 15 and the paper on the paper feed tray 17 are each significantly different in size, and should be selectively switched and used as necessary.

The conveyance rollers I+, +2, 14, 15, 16, etc. are each controlled on and off by a common drive source via clutches.

The paper feed rollers 15[1, +70 are also connected to the 5 drive sources through one-way clutches, and are independently turned on and off.
Off control.

For example, considering a transport system that passes through transport rollers I+ and +2, the paper feed roller 13 is instructed to drive intermittently so that multiple sheets of paper are lined up at a predetermined interval on the transport path. It is given. Therefore, when a paper feed signal is generated in the image recording apparatus, the paper feed roller 150 and the conveyance roller 12 start driving, and the first sheet is fed out by the paper feed roller o13Q.

The amount of drive of the paper feed roller 100 is sufficient until the leading edge of the paper is gripped by the conveyance roller 12. This is because from then on, the conveyance roller 12 sends the sheet from the front, and then the conveyance roller 11 takes over and sends it toward the registration roller 9.

After the first sheet of paper has been fed, the paper feed roller 100 is driven again after a time interval determined by the paper feed signal to the trailing edge of the first sheet, and feeds the second sheet. Pull out a piece of paper.

The same intermittent operation is repeated thereafter.

Now, when the leading edge of the first sheet of paper is detected by the sensor 10, from the relationship between that point and the paper feed speed, the point at which the first sheet of paper reaches the register (o-ra) 9 is the set point. The first sheet of paper comes into contact with the registration roller 9 and is registered. At the same time, the transport i3o 711,12 stops. Also, if the paper feed roller 160 is in the middle of paper feeding, the paper feed roller 1
60 is also stopped. Thereafter, the registration roller 9 starts driving in response to a command from the image synchronization signal, and feeds out the first sheet of paper. At the same time, the transport rollers II and +2 also start driving, and if the paper feed roller 100 has stopped in the middle of paper feeding drive, this paper feed roller 130 also starts driving and feeds the paper. resume. However, if the paper feed roller 130 has already sent out the required number of sheets based on the paper feed signal at this point in time, the paper feed roller 150 does not need to be driven and is therefore not driven.

Thereafter, similarly, the feeding of the paper on the conveyance path is interrupted every time the paper hits the registration roller 9, and the paper is moved and fed intermittently.

Note that, if T is one drive time required for the feeding roller 130 to send out one sheet of paper to be fed, even if the above paper feeding is interrupted during this time T, the interruption time is α is not measured as the required driving time of the paper feeder 0150,
After the paper feed roller 150 is driven for the remaining time obtained by subtracting the time measured as the drive time before interruption from T,
Be controlled so that the drive is turned off.

In other words, when the conveyance roller and paper feed roller stop driving during paper feeding, if the paper feed roller is still in the middle of feeding, the next drive will be performed when the paper feed roller is in the middle of feeding. After paper feeding is taken over by the conveyance rollers, the drive of the paper feed rollers is cut off.

This is because, if this is not done, the paper feeding roller I30 may not feed the paper completely.

When the nth sheet of paper comes into contact with the registration roller 9,
When the transport rollers 11 and 12 and the paper feed roller 130 stop driving, if the paper being fed and output by the paper feed roller 130 is the last paper designated by the feed signal, the above n In synchronization with the feeding of the first sheet of paper by the registration rollers 9, the paper feed roller 130 restarts its drive and feeds out the paper that was in the middle of being fed. 12, etc., are not driven even if they are driven.

For example, when the image recording device is an electrophotographic device, the paper feed signal and the image synchronization signal are signals emitted from the control unit as the process progresses every cycle of the recording process, and When the device is a plotter, this is a signal output from an image reading device or an electronic computer/machine connected to the plotter. Note that the paper feed signal is processed several sheets ahead of the image synchronization signal, and in the end, the numbers of these two signals match.If the image recording device is in block-, the number of sheets to feed is set first. (It is also possible.

According to the present invention, the conveyance path is always filled with paper,
The actual distance from the paper to be fed to the transfer section corresponds to the distance from the registration rollers to the transfer section, so that the conveyance time can be shortened and the recording speed can be improved. .

Therefore, it is possible to effectively deal with cases where it is unavoidable to use a long conveyance path due to process problems or with an increase in the length of the conveyance path due to an increase in the size of the apparatus, and to improve the recording speed. When using paper of various sizes, sort the paper by size, for example, letter size, A4 size,
Each short feed of B5 size is one group, B4 long size, legal long size, and A4 long size are another group, and each group is connected to paper feed tray 13, 1.
7, and when setting the driving maximum (driving time) of the paper feed roller, the shortest size paper in each group may be set as the base thread.

In the above description, transport rollers I+, +2 and paper feed roller 1
Although the conveyance path related to No. 30 has been described, other conveyance paths, such as conveyance rollers 14, 15. +6 and paper feed roller 1
Control similar to the above description is also performed on the conveyance path related to 70.

FIG. 2 shows another embodiment of the present invention, in which the paper feed trays are vertically aligned and the transport paths are also formed in a straight line. The name and function of each member corresponds to each part described using the same reference numeral in FIG. 1, when the numerals in FIG. 2 are omitted.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a paper feeding section of an image recording apparatus explaining one embodiment of the present invention, and FIG. 2 is the same diagram explaining another embodiment of the present invention. 9.9'...Registration roller, 10.10'...(
) sensor as paper detection means, I+, +2.14.
15.16.14', +5', +6'...Conveyance roller, 130,130'...Paper feed roller.

Claims (1)

[Scope of Claims] 1 Paper placed on a paper feed tray is fed out by a paper feed roller, the fed out paper is fed by a conveyance roller on a conveyance path, and in the middle, the paper is fed by a registration roller. In the paper supply means that is set to continue general feeding toward the transfer unit after adjusting the The drive system is provided with a conveyance roller control means for controlling the 5° pivoting of the conveyance roller, and a paper detection means for detecting the arrival of paper at a position in front of the registration rollers, so that the leading edge of the paper being conveyed reaches the registration rollers. When it reaches this point, the paper feed by the conveyance roller and the first drive of the paper feed roller in the paper feed state are stopped, and after the registration by the registration roller is completed, the registration roller and the conveyance roller are driven by the image synchronization signal, and the paper feed is stopped. 1. A paper feed control method for an image recording apparatus, characterized in that paper is conveyed by driving a paper feed roller in a state. 2. The paper feeding state described in claim 1 is a state when a predetermined number of sheets of paper has not been fed completely or a state when the paper feeding roller is in the middle of paper feeding. A paper feed control method for an image recording apparatus. 3 During paper feeding as described in Claims j and α1, when the driving of the transport roller and the paper feeding roller is stopped, if the paper feeding roller is still in the middle of feeding, the next drive A paper feed control method for an image recording apparatus, characterized in that the drive of the paper feed roller is cut off after the conveyance roller takes over the feeding of the paper during the above-mentioned feeding. 4. A paper feed control method for an image recording apparatus, wherein the amount of drive of the paper feed roller according to claim 1 is controlled according to the size of the paper being handled. 5. The driving amount of the paper feed roller described in claim 4 is:
A paper feeding method for an image recording apparatus, characterized in that the setting is made according to the shortest size paper among a group of papers of similar sizes.