JPS6359304B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a recording device such as a printer, a facsimile machine, or a copying machine, and more specifically, the present invention relates to a recording device such as a printer, a facsimile machine, or a copying machine. The present invention relates to a recording device that can position the above recording medium.

[Prior art]

Conventionally used recording apparatuses generally record by winding recording paper around a rotating drum in alignment with a reference position. In such a recording apparatus, synchronization in the main scanning direction is performed by generating a reference signal from a rotating drum to notify the reference position. However, such a recording apparatus has disadvantages in that not only the length of the recording paper is limited, but also the mechanism for winding the recording paper becomes complicated. For this reason, there is a need for a recording apparatus in which the length of recording paper can be freely selected within the circumferential length of the rotating drum, and in which the length of the recording paper can be wound at any arbitrary position on the circumference of the rotating drum.

An example of winding the recording paper in the above-mentioned recording apparatus is one in which a negative pressure is applied to the inside of the drum having through holes, and the recording paper is sucked around the drum.
To record an image at a predetermined position on recording paper that is wound around a rotating drum by suction, a break in the recording paper is detected and a detection signal is generated, and main scanning marking is synchronized with this detection signal. It is necessary to do so.

However, if a detection signal that simply detects a recording sheet is used as a synchronization signal, there are the following drawbacks. That is, the edge of the recording paper forms wave-like irregularities on the rotating drum depending on the position of the suction holes, and the detection signal accordingly shifts. An image recorded synchronously with such a detection signal is undesirable because lines that should be straight in the sub-scanning direction appear wavy.

In other words, there is a drawback that recording cannot be performed at appropriate positions depending on the front end and rear end of the recording paper.

[Objective] The present invention provides a recording device capable of accurately recording on a rotatable recording medium support in synchronization with the leading edge or trailing edge of a recording sheet.

In view of the above points, the present invention provides a head close to the rotating surface of a rotating member that contacts at least a portion of the recording paper and rotates in the main scanning direction, and performs sub-scanning on the rotating member with the head. In a recording device that records an image on the sheet of paper,
a detection means for detecting an edge of the paper, and deriving rotation control information of the rotating member from when the detection means detects the front edge of the paper until the front edge of the paper corresponds to the vicinity of the head. a first deriving means for detecting the first deriving means of the rotary member from when the rear end of the sheet is detected by the detecting means until the rear end of the sheet corresponds to the vicinity of the head;
a second deriving means for deriving rotation control information relating to a different amount of rotation control from the rotation control information derived by the deriving means, the rotation control information from the first deriving means or the second deriving means; Based on the above, an object of the present invention is to provide a recording device comprising a control means for controlling the rotating member so that the head is relatively positioned at a recording start position or a recording end position on the paper. It is said that

[Example] Hereinafter, the present invention will be explained based on examples.

FIG. 1 is a perspective view for explaining a recording apparatus according to the present invention. In FIG. 1, the rotating drum 2 supporting the recording paper 1 on its circumference is located at its rotating shaft 1-1.
It rotates by driving a pulley 5 fixed to the drive motor 3 and belt 4.
The marking head 6 disposed close to the rotating surface of the rotating drum 2 is operated by a gear 7 fixed to the rotating shaft 1-1, a gear 8 meshing with the gear 7, and a helical screw 9 fixed to the gear 8. Then, the head 6 moves parallel to the rotating shaft 1-1 (sub-scanning), and by applying a recording signal to the head 6 from the outside, recording is performed on the recording paper 1 in accordance with the recording signal applied. The paper detector 10 consists of a light emitting element and a light receiving element arranged close to the rotating surface of the rotating drum 2, and identifies the recording paper 1 and the rotating drum 2, and detects the leading edge FE of the recording paper 1 in the circumferential direction. Or rear end RE
It generates a paper detection signal for marking in synchronization with the edges of the paper. Furthermore, a slit disk 11 is connected to the rotating shaft 1-1 of the rotating drum 2, and this slit disk has first slits S1 that are divided into equal intervals around one circumference, and one slit S1 per circumference. Two types of slits S2 are formed,
Light emitting element 12, light receiving element 13 and light emitting element 1, respectively
4. The light receiving element 15 generates a rotation pulse signal and a reference pulse signal.

The rotary drum 2 has a cylindrical shape with a large number of holes H on its surface, and a suction pump P sucks the air inside the rotary drum 2 to create a negative pressure inside the rotary drum 2. It supports adsorption. Also, the parts of the rotating drum 2 and the inside of the hole H are coated with matte black paint, and the detection level of the paper detector 10 is the same whether it is in the hole H or not. This is distinguished from the detection level of 1. In other words, recording paper 1 and rotating drum 2
Since they have different light reflectances, it is possible to determine whether the recording paper 1 or the rotating drum 2 is present at a position facing the paper detector 10.

In this embodiment, when viewed from the lateral side, as shown in FIG.
-1, the position 10-1 where the paper detector 10 is placed, and the position 6-1 where the marking head 6 is placed are different.

To further explain according to FIG. 1B, position 1
When the second slit S2 arrives at 5-1, the leading edge FE and trailing edge of the recording paper 1 are at positions FE-1 and RE, respectively.
-1, the number of rotational pulse signals NFE derived while the tip FE and rear end RE reach the position 6-1 where the nozzle is arranged, NRE is NFE
=Nb+Nc, NRE=Na+Nc. However, Na
is the number of rotational pulse signals derived while position RE-1 reaches 10-1, Nf is the number of rotation pulse signals derived while position RE-1 reaches 1
The number of rotation pulse signals derived while the position 10-1 reaches 6-1, Nc is the number of rotation pulse signals derived while the position 10-1 reaches 6-1, and this value is the number of rotation pulse signals derived while the paper detector 10 It takes a certain fixed value depending on the physical positional relationship of the nozzle 6 and 10-1 and 6
When -1 matches, Nc=0.

The operation before the head 6 starts recording on the recording paper 1 will be explained.

First, the head 6 is located away from the recording paper 1, and the recording paper 1 is supplied to the rotating drum 2 by a paper supply means (not shown) and wound around the rotating drum 2. Next, when a paper position setting signal is issued from inside or outside the recording device, the number of rotational pulse signals Na and the paper leading edge detection signal derived from the time the reference pulse signal is issued until the paper trailing edge signal is obtained are calculated. Number of rotational pulse signals derived until obtaining
Count Nb.

As described above, the distance between the paper detector position and the head position is the predetermined value of the number of rotational pulse signals Nc, and this value is stored in the position correction storage circuit.

Therefore, Nb and Nc are added together, Na and Nc are added together, and NFE and NRE are stored in the counting storage circuit, respectively. In this state, when preparation for recording is completed and recording begins and a reference pulse signal is generated, the rotational pulse signal numbers NFE and NRE stored in the counting storage circuit are read out, converted to one's complement, and preset in the counter.

Next, rotation pulse signals are sequentially applied to the counter as clock signals, and the number of applied rotation pulse signals is the number of stored rotation pulse signals.
When NFE and NRE become equal, a carry pulse occurs, indicating the leading and trailing edges of the paper. This carry signal forms a signal indicating the paper position in synchronization with the rotation of the drum. By controlling the recording signal with the signal indicating the paper position, recording is performed in synchronization with the circumferential direction of the paper.

FIG. 2 is a timing chart for explaining the present invention.

In FIG. 2, the signal 1 indicates a rotation pulse signal, which is derived at intervals corresponding to at least the pixel interval of the image to be recorded on the recording paper 1, and forms a clock signal. When the paper position setting signal 2 is issued from an external or internal device, it is held in a setting signal holding circuit for at least a period of time exceeding one cycle (one rotation period) of the rotating drum, as shown in 3. The held holding signal 3 generates a set period signal in synchronization with the reference pulse signal 5, as shown in 4. Prior to this setting period, the number of rotation pulses Nc for correction is loaded into the count storage circuit by the position correction load signal 6. 7 is the paper detection signal,
Since the high-level portion is the period during which paper is being detected, the rising edge of the paper detection signal indicates the leading edge of the paper, and the falling edge indicates the trailing edge. Using the paper detection signal 7 and the position correction load signal 6, count signals are created as shown at 8 and 9 in FIG. Therefore, the two counting storage circuits store the number of rotational pulse signals Nb and Na corresponding to periods 8 and 9 from the reference pulse signal to the leading and trailing ends of the paper, and the correction value Nc.
are counted and stored. This count storage operation is performed during one rotation of the drum. Therefore, when the set period of the set period signal extends over two periods as shown in FIG. 2, the second set period is ignored. When the set period ends, the count value stored in the count storage circuit is input to the readout circuit at the timing of the reference pulse signal. The readout circuit starts from the reference pulse signal, counts rotational pulses corresponding to the input count value, and then generates pulse signals indicating the leading edge and trailing edge of the paper, such as a leading edge signal 10 and a trailing edge signal 11.
Therefore, the time when the leading edge signal and the trailing edge signal of the paper are derived coincides with the time when the leading edge and the trailing edge of the recording paper pass the position facing the nozzle.

Once the times at which the leading edge signal and trailing edge signal are derived are calculated once, these leading edge signals and trailing edge signals are repeatedly used in subsequent recordings. The broken lines at 10 and 11 indicate that the position setting ends in the first cycle, and the operation of the readout circuit starts in the set period of the second cycle, but since this is the set period of the set period signal, the signal is not activated. This shows that the leading edge signal and the trailing edge signal are output after the set period is gated. A recording synchronization signal is created by the leading edge signal and trailing edge signal generated in this manner.

FIG. 3 is a circuit diagram schematically showing a circuit implementing the present invention.

In FIG. 3, 16 is a terminal for inputting the position setting signal shown in FIG. 20 is a signal holding circuit for holding the input position setting signal for at least one cycle of the drum to form a holding signal as shown in FIG. ing. Terminal 17,1
8 and 19 are reference pulse signals shown in FIG. 2 and 5, respectively;
This is a terminal for inputting the rotation pulse signal shown in FIG. 21 and the paper detection signal shown in FIG. 27. The held signal held and formed by the signal holding circuit 20 is transferred to a set period circuit 2 consisting of a D-type flip-flop.
1, the set period signal shown in FIG. 2 is generated by being triggered by the reference pulse signal. A counting clock gate circuit 22 consisting of a flip-flop and an AND gate generates a counting gate signal 1 (FIG. 2, 10) from the reference pulse signal to the leading edge of the paper, and only during this period a rotation pulse signal is input to the counting memory circuit 23. . On the other hand, prior to counting, the correction value Nc is inputted in advance from the position correction storage circuit 25 to the count storage circuit 23 by the position correction load signal circuit 24 consisting of an AND gate. Therefore, the value obtained by adding a number of rotation pulse signals Nb corresponding to the gate period of the counting gate signal to this correction value Nc
NFE is stored in the count storage circuit 23. The trigger signal input to the counting gate circuit 2 is an edge trigger of a signal obtained by shaping the paper detection signal by the waveform shaping circuit 28. The count value representing the paper leading edge position stored in the count storage circuit 23 is inverted by an inverter circuit 26 for creating a one's complement number, and then read out by a readout circuit 27 at the timing of the reference pulse signal.
is input. The readout circuit 27 consists of a presettable counter, and each time the reference pulse signal is input, the readout circuit 27 inputs a count value in the form of a complement. Thereafter, the rotation pulse signal becomes a clock, performs a counter operation, and outputs a carry signal when the counter becomes full. This is a signal that is output by counting the input count value after the reference signal is input, and becomes the tip signal shown in FIG. 210. On the other hand, the same process is performed for the rear end. To create the same rising edge, the edge of the paper detection signal that is inverted by the inverter rotation 29 triggers the counting clock gate circuit 30. Normally, the correction value Nc ₁ stored in the trailing edge position correction storage circuit 31 is smaller than the complement value Nc of the position correction storage circuit 25. This is to prevent the top of the rotating drum 2 from getting dirty by finishing recording earlier than the trailing edge of the paper. Therefore, the trailing edge correction storage circuit 31 may be configured as a circuit that derives a value obtained by subtracting a certain value from the correction value Nc stored in the leading edge correction storage circuit 25. a rear end count storage circuit 32, an inverter circuit 33 for forming a complement;
The readout circuit 34 is similar to that described at the leading edge of the paper. However, since Nc ₁ is set to <Nc,
The trailing edge signal is derived before the trailing edge of the paper reaches a position opposite the nozzle. A synchronizing signal for recording is formed by applying the leading edge signal and trailing edge signal thus obtained to a synchronizing circuit 35 consisting of an RS flip-flop.

Although the creation of a synchronization signal is achieved in the above manner, the synchronization signal is further transmitted to two data buffers 41 and 42.
is applied to. That is, FIG. 3 is an example of so-called double buffering in which one of two data buffers 41 and 42 is used alternately for input and one for output, and input data signals are input from input terminals 36 and 37, respectively. The synchronizing signal is converted into two series of signals by the gate circuit 38, which controls the clock gate circuits 39 and 40 to alternately control one of the buffers 41 and 42 to be an input and the other to be an output. The recording data is output to the terminal 45 via the amplifier circuit 44, and the head 6 records an image synchronized with the edge of the recording paper. The timing is shown in Figure 4.
1 is a synchronization signal, and 2 and 3 are signals applied from the gate circuit 38 to the clock gate circuits 39 and 40. Although the above embodiment has been described assuming that the position 10-1 and the suction 6-1 are different, if the two positions are configured to be at the same position,
Since Nc=0, the correction storage circuits 25 and 31 in FIG. 3 are unnecessary.

〔effect〕

As detailed above, according to the present invention, by driving the rotating member based on the rotation control information,
It has become possible to accurately position the head on the recording medium.

According to the front edge and rear edge of the recording paper detected by the present invention, the recording head can be relatively positioned at the recording start position and recording end position on the recording paper, so that the recording head can always be positioned properly on the paper. Now it is possible to record at a certain position. Moreover, since the recording start position from the front end of the paper and the recording end position from the rear end of the paper can be controlled differently as appropriate, extremely high-quality recording can be performed. Furthermore, the present invention can provide a recording device that does not stain rotating members.

According to the present invention, a head is provided in close proximity to the rotating surface of a rotating member that contacts at least a portion of the recording paper and rotates in the main scanning direction, and the head scans the rotating member in a sub-scan direction. A recording device for recording an image on a sheet, a detection means for detecting an edge of the paper, and a process from when the detection means detects the front edge of the paper until the front edge of the paper corresponds to the vicinity of the head. a first deriving means for deriving rotation control information of the rotating member; and a first deriving means for deriving rotation control information of the rotating member; and a first deriving means for deriving rotation control information of the rotating member; a second derivation means for deriving rotation control information regarding a member whose rotation is different from rotation control information derived by the first derivation means of the member, from the first derivation means or the second derivation means; A recording apparatus comprising a control means for controlling the rotating member so that the head is relatively positioned at a recording start position or a recording end position on the paper based on rotation control information. It has become possible to provide

[Brief explanation of the drawing]

1 shows a recording device according to the present invention, A is a perspective view, B is a side view, FIG. 2 is an operation timing diagram of the recording device shown in FIG. 3, FIG. 3 is a circuit diagram showing the recording device, and FIG. FIG. 4 is an operation timing diagram of the recording apparatus shown in FIG. 3. Here, 1 is recording paper, 2 is a rotating drum, 6 is a head, 10 is a paper detector, 20 is a signal holding circuit, 2
1 is a set period circuit, 22 and 30 are gate circuits, 2
3 and 31 are count storage circuits, 26 and 33 are inverter circuits, and 27 and 34 are readout circuits.

Claims (1)

[Scope of Claims] 1. A head is provided close to the rotating surface of a rotating member that contacts at least a portion of the recording paper and rotates in the main scanning direction, and the head performs sub-scanning on the rotating member. Therefore, in the recording apparatus for recording an image on the paper, a detection means detects an edge of the paper, and after the detection means detects the front edge of the paper, the front edge of the paper is near the head. a first deriving means for deriving rotation control information of the rotating member until the corresponding position is reached; a first deriving means for deriving rotation control information of the rotating member until the detecting means detects the trailing edge of the paper until the trailing edge of the paper corresponds to the vicinity of the head; second deriving rotation control information relating to control of a different amount of rotation from the rotation control information derived by the first deriving means of the rotating member up to
a deriving means, the rotary member is configured to relatively position the head at a recording start position or a recording end position on the paper based on rotation control information from the first deriving means or the second deriving means; 1. A recording device comprising a control means for controlling.