JPH022049A - Paper feed method of printer - Google Patents

Abstract

PURPOSE:To prevent the superposition of printing paper on that of the previous page by a method wherein the second paper is picked without waiting the exposure of the first paper and the paper on a feed path is allowed to stand by when the development of the dot pattern of printing data is not finished at the exposure time of the first paper. CONSTITUTION:The paper in a main hopper 13 is picked up by a paper feed mechanism to be sent out to a paper feed path 22 and a printing dot pattern is exposed to a photosensitive drum 21 by a light emitting body 18 and the exposed printing data is transferred to the paper in a printing part 25. The paper passing on the printing part 25 is subjected to fixing processing by a heating roller 26 to be sent to a stacker 19. Resists 23, 24 stop the paper 20 on the paper feed path temporarily when the exposure processing of the data to be printed on the paper 20 to the photosensitive drum 21 is delayed from predetermined time. The resists 23, 24 are controlled by resist control mechanisms 17, 16 and, when the development of a printing dot pattern is delayed in the printing control apparatus 11 and exposure is too late for predetermined time, said mechanisms 17, 16 bring the resists 23, 24 to an effective state on the basis of the instruction of the printing control apparatus 11.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to paper conveyance control of a printing apparatus that continuously supplies a plurality of sheets of paper to a paper conveyance path by a paper feed mechanism.

[Conventional technology]

The time relationship between paper picking, exposure, and transfer in a conventional cut paper laser beam printer is shown in FIG. 2(c). 1 on the time axis. ．． 1. ,, t□ is the time required for the sensitivity tram 21 to rotate the corresponding distance, and the paper 2
0 equals the time required to travel the same distance. Figure 2 (a
), 1 is the distance from the exposure point 32 to the transfer point 31.

L indicates the distance from the pick point 30 to the transfer point 31. Generally L)l. FIG. 2(b) shows that the distance between the starting points of the paper on the paper transport path is m.

Picking is the operation of sending the paper 20 from the hopper 13 to the paper conveyance path 22, exposure is the operation of burning toner on the photosensitive drum 21 based on print data sent from the print control device 11, and transfer is the operation of printing toner on the photosensitive drum 21. This is an operation to transfer the toner printed on the paper 20.

After the first sheet of paper is picked with the pick 40 and a time 't, . After exposure 41 is performed, rt,, -(Lt
, t+)J, the second sheet of paper is picked 43. Exposure 44 of the second sheet of paper is from the pick 43 to rl;
, , is performed after −j+J has elapsed.

The same process is performed for the third and subsequent sheets, and picking is performed at new intervals, resulting in continuous printing.

When printing data is developed page by page, the internal configuration of the print control device is generally as shown in FIG. 3. Print data sent from the channel 50 to the print control device 11 is sent to the intermediate buffer memory 56 via the channel adapter 51.

The data taken into the intermediate buffer memory 56 is developed by a development processor 52 into a printing dot pattern corresponding to the paper, and is written into the full dot memory 54. The printed dot pattern developed in the full dot memory 54 is sent to the printing device 12 via the printer adapter 55.

In the time chart of FIG. 2(C), if the printed dot pattern has not been developed in the full dot memory 54 by the time of the first exposure 41, the exposure time is delayed and the exposure is performed after the printed dot pattern is developed. In this case, the transfer is performed t1 after exposure, but since the paper 20 on the paper transport path 22 is picked up and arrives at the transfer roller 31 later, the resist is placed before the transfer point on the paper transport path 22. 23
is provided, and the conveyance of the paper is inhibited by the register 1-23.

The paper conveyance inhibition by the resist 23 is canceled immediately before the print data exposed on the photosensitive drum reaches the transfer point.

The pick operation for the second sheet is executed after the exposure operation for the first sheet is completed. This is to prevent two or more sheets of paper from overlapping on the paper transport path 22. The completion of the exposure operation means that the transfer will be performed after a certain period of time, and indicates that a new sheet of paper may be picked into the sheet transport path 22.

[Problem to be solved by the invention]

In the above conventional technology, when the relationship between the distance between the pick point 3° and the transfer point 31 in FIG. 2, the distance 1 between the exposure point 32 and the transfer point 31, and the conveyed paper interval m is "m L-1", Continuous printing becomes impossible. That is, the interval between the picks becomes rt, -t+J, and the paper cannot be conveyed at an interval of t1. The time relationship in this case is shown in FIG.

The purpose of the invention is to perform continuous printing when r m < L - I J. That is, the paper is conveyed at intervals of t1.

[Means to solve the problem]

The above purpose is to provide a mechanism for waiting the next page of print sheets on the conveyance path between the hopper and the drum, and pick the second sheet without waiting for the exposure of the first sheet.

If the dot pattern development of the print data is not completed at the exposure time of the first sheet, a mechanism is activated to make the print sheet on this conveyance path standby.

[Effect]

In the present invention, a paper stopping mechanism on a paper transport path operates according to instructions from a print control device. Therefore, in the method of picking paper without waiting for the print data of the previous page to be exposed,
If the print data of the previous page is not exposed in time for a predetermined time, the paper on the paper transport path is stopped to prevent it from overlapping with the paper of the previous page.

〔Example〕

An example of this embodiment will be described below with reference to FIGS. 1 and 3. FIG. 3 is a configuration diagram of the print control device 11. The print control device 11 includes a channel adapter 51 that transfers data to a channel 50, and a development processor 5 that develops data sent from the channel adapter 51 into a print dot pattern.
2. It is composed of a full dot memory 54 that stores print dot patterns on a page-by-page basis, a printer adapter 55 that transfers data to and from the printing device 12, and a management section 53 that performs overall control. Print data is commanded from channel 50,
It is sent in the form of compressed data to the intermediate buffer memory 56 via the channel adapter 51.

The data taken into the intermediate buffer memory 56 is developed by the development processor 52 into a print dot pattern corresponding to the paper according to instructions from the management section 53, and is written into the full dot memory 54. The print dot pattern developed in the full dot memory 54 is transferred to the printer adapter 5 according to instructions from the management section 53.
5 to the printing device 12. Data sent to the printing device 12 is transferred in real time in accordance with the timing of exposure within the printing device 12.

FIG. 1 is a diagram showing the interior of the printing device 12. As shown in FIG. The paper in the main hopper 13 is picked by the paper feed mechanism 14,
The paper is sent out to the paper transport path 22. The printed dot pattern is exposed onto the photosensitive drum 21 by the light emitter 18. The exposed print data is transferred onto paper by the printing unit 25. The paper that has passed over the printing section 25 is fixed by a heat roller 26 and sent to a stacker 19. The resists 23 and 24 are used to temporarily stop the paper 20 on the paper transport path when the exposure process of the data to be printed on the paper 2o onto the photosensitive drum 21 is delayed beyond a predetermined time. Resist 23.24
is controlled by a registration control mechanism 17.16. In the print control device 11, the registration control mechanism 17.16 activates the resists 23.24 in response to instructions from the print control device 11 if the exposure is not completed in time due to a delay in the development of the printed dot pattern. Expansion hopper 1
Reference numeral 5 denotes a hopper that supplies paper when the main hopper 13 runs out of paper, which allows continuous printing even while paper is being replaced.

The predetermined exposure time is the exposure timing shown in FIG. As can be seen from this time chart, the second sheet of paper is picked without waiting for the exposure of the first sheet. While the exposure process is being performed at the timing shown in Figure 5, the resist 23.2
4 is not working and printing is performed at the optimum speed.

In the case of L -1>2 m, the number of resists on paper conveyance may be added by one, and the third sheet may be picked without waiting for the exposure of the first sheet. In this way, if the number of resists is prepared according to the distance between the hopper and the photosensitive drum, paper can be fed at an optimal speed and high-speed printing can be achieved.

〔Effect of the invention〕

According to the present invention, even if the relationship between the distance iJ L between the pick point and the transfer point, the distance 1 between the exposure point and the transfer point, and the minimum printable paper starting point distance m is rm<L-IJ, the paper distance m You can feed paper with . Therefore, high-speed printing is possible even in the case of rm (L-IJ). rm<L-IJ means that the distance aL between the pick point and the transfer point can be made longer.Generally, in cases where multiple hoppers are provided or a large capacity is The distance between the pick point and the transfer point becomes longer, and the present invention exhibits its effects.

[Brief explanation of the drawing]

FIG. 1 is a structural diagram of a printing device showing an embodiment of the present invention, FIG. 2 is an explanatory diagram showing the positional relationship between a pick point, an exposure point, and a transfer point. FIG. 3 is a configuration diagram of a printing control device. FIG. 4 is a time chart of the conventional method, and FIG. 5 is a time chart of the method of the present invention. 11... Printing control device, 12... Printing device. 13... Main hopper, 16.17... Resist control mechanism, 18... Light emitter, 19... Stacker, 22...
・Paper transport path, 23.24...Register, 25...
Printing section, 26...Heat roller, 30...Pick point, 31...Transfer point, 32...Exposure point, 50...Channel, 52...Development processor, 54...Full dot memory.

Claims (1)

[Claims] 1. In a printing device that continuously supplies a plurality of sheets of paper to a paper conveyance path by a paper feed mechanism, a means is provided to temporarily stop the plurality of sheets of paper on the paper conveyance path according to instructions from the print control device. When the exposure data for the first page on the transport path is not ready at the specified time, all paper transport on these transport paths is temporarily stopped and restarted again after the exposure data is ready. A paper supply method for a printing device characterized by feeding all the paper.