JP2005096946A - Image forming device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image forming device capable of handling a sheet on a loading means by air heated by a heating means and handling the sheet on the loading means by hot air in a short time after inputting an instruction for starting image formation while suppressing consumption of electric power of the heating means as much as possible. <P>SOLUTION: This image forming device is provided with a fan 417 for blowing air for a sheet loaded on a paper deck 401, a heater 14 heating air blown by the fan 417, an operation part 30 setting quality of material of the sheet loaded on the paper deck 401 and inputting an instruction for starting image formation, and a control part 16 starting heating control of the heater 14 without waiting an instruction for start from the operation part 30 when forming image on the sheet fed onto the paper deck 401 in which coated paper or art paper is set. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an image forming apparatus provided with or connectable to a sheet feeding device that blows heated air to sheets stacked on a stacking unit.

  Conventionally, in an image forming apparatus such as a copying machine or a printer, sheets that can be continuously fed are usually limited to high-quality paper or plain paper designated by the copying machine manufacturer. In such paper, the surface smoothness is low and air permeability is high (air easily passes), so air easily flows between the sheets, so when taking out the paper one by one from the stacked paper, There was little occurrence of double feeding due to mutual adsorption.

  On the other hand, in recent years, with the diversification of recording paper, in addition to thick paper, OHP paper, tracing paper, etc., art paper and coats that have been coated on the surface of the sheet in order to produce whiteness and gloss due to colorization market requirements There is an increasing demand for image formation on a sheet having a smooth surface such as paper. However, these OHP paper, tracing paper, art paper, coated paper, etc. have high smoothness and low air permeability (air does not easily pass through), so when sheets are stacked in a particularly high humidity environment, The frictional separation method generally used in conventional copying machines, printers, and the like has a problem of frequent double feeding and misfeeding.

Therefore, as a method for eliminating such a low-permeability sheet adhesion state in advance, it has been proposed to eliminate the adhesion force of the smooth sheet by blowing air from the side surface of the stacked sheets (for example, (See Patent Document 1). In addition, the air heated by the dehumidifying heater disposed in the lower part is disposed on the uppermost sheet upper surface or the sheet side surface on the sheet stacking tray to exhaust the air, thereby eliminating the adhesion force on the smooth sheet. (For example, refer to Patent Document 2). Also, an air heating means for heating the air to keep the humidity of the air blown against the sheet at a predetermined level based on the temperature or humidity of the outside air, and a pre-overheating temperature detection means for detecting the temperature of the air before being heated. It is proposed to improve the sheet supply performance and maintain the quality when the sheet is output (for example, see Patent Document 3).
JP-A-11-5543 JP-A-6-32473 JP 2001-48366 A

  However, if the heating control of the heater is always performed in order to enable sheeting with warm air at any time, there is a problem that power is wasted. On the other hand, if the heater heating control is started after the image forming operation that requires hot sheet blowing is started, it takes time until the heater temperature reaches the temperature required for sheet rolling, resulting in a decrease in productivity. However, there is a problem that it makes the user wait.

  In order to solve the above-described problem, the invention described in claim 1 includes a stacking unit that stacks sheets, a feeding unit that feeds sheets from the stacking unit, and a sheet fed by the feeding unit. Image forming means for forming an image, blower means for blowing air to the sheets stacked on the stacking means, heating means for heating air blown by the blower means, and sheets stacked on the stacking means A setting means for setting the material, an instruction input means for inputting an instruction to start image formation, and when the predetermined material is set by the setting means and image formation is performed on the sheet fed from the stacking means, An image forming apparatus comprising: a control unit that starts heating control of the heating unit without waiting for a start instruction from the instruction input unit.

  According to a second aspect of the present invention, there are provided a plurality of stacking units for stacking sheets, a feeding unit for feeding sheets from any of the plurality of stacking units, and a sheet fed by the feeding unit. An image forming unit for forming an image on the sheet, a blowing unit for blowing air to at least one of the plurality of stacking units, and a heating unit for heating the air blown by the blowing unit A setting unit that sets a material of a sheet stacked on the stacking unit provided with at least the air blowing unit among the plurality of stacking units, an instruction input unit that inputs an instruction to start image formation, and the plurality of stacking units A selection unit that selects a stacking unit on which sheets to be fed are stacked and a stacking unit provided with the blowing unit are selected by the selection unit, and the setting unit And a control unit that starts heating control of the heating unit without waiting for a start instruction from the instruction input unit when a predetermined material is set. is there.

  The invention described in claim 3 is a stacking unit that stacks sheets, a feeding unit that feeds sheets from the stacking unit, a blowing unit that blows air to the sheets stacked on the stacking unit, An image forming apparatus capable of connecting a sheet feeding apparatus having heating means for heating air blown by the blowing means, and an image forming means for forming an image on the sheet fed by the feeding means A setting unit for setting the material of the sheets stacked on the stacking unit, an instruction input unit for inputting an instruction to start image formation, and a predetermined material set by the setting unit and fed from the stacking unit. An image forming apparatus comprising: a control unit that starts heating control of the heating unit without waiting for a start instruction from the instruction input unit when image formation is performed on a sheet; It is intended to provide.

  According to a fourth aspect of the present invention, there is provided a sheet stacking unit that stacks sheets, a sheet feeding unit that feeds sheets from the stacking unit, and an image formation that forms an image on the sheet fed by the sheet feeding unit. Means for blowing air to the sheets stacked on the stacking means, heating means for heating the air blown by the blower means, and detection for detecting the material of the sheets stacked on the stacking means Means for inputting an image formation start instruction, and when the predetermined material is detected by the detection means and image formation is performed on the sheet fed from the stacking means, the instruction input means An image forming apparatus comprising: a control unit that starts heating control of the heating unit without waiting for a start instruction.

  According to a fifth aspect of the present invention, there are provided a plurality of stacking units for stacking sheets, a feeding unit for feeding sheets from any of the plurality of stacking units, and a sheet fed by the feeding unit. An image forming unit for forming an image on the sheet, a blowing unit for blowing air to at least one of the plurality of stacking units, and a heating unit for heating the air blown by the blowing unit A detecting means for detecting the material of the sheets stacked on the stacking means provided with at least the blower means among the plurality of stacking means, an instruction input means for inputting a start instruction for image formation, and the plurality of stacking A selection unit that selects a stacking unit on which a sheet to be fed is stacked and a stacking unit provided with the blowing unit are selected by the selection unit, and the detection unit And a control unit that starts heating control of the heating unit without waiting for a start instruction from the instruction input unit when a predetermined material is detected. is there.

  The invention described in claim 6 is a stacking unit that stacks sheets, a feeding unit that feeds sheets from the stacking unit, a blowing unit that blows air to the sheets stacked on the stacking unit, In the image forming apparatus to which a sheet feeding apparatus having heating means for heating air blown by the blowing means and detection means for detecting the material of the sheets stacked on the stacking means can be connected, the feeding Image forming means for forming an image on the sheet fed by the means, instruction input means for inputting an instruction to start image formation, and a predetermined material detected by the detecting means, and fed from the stacking means An image forming apparatus comprising: a control unit that starts heating control of the heating unit without waiting for a start instruction from the instruction input unit when image formation is performed on a sheet; It is intended to provide.

  According to a seventh aspect of the present invention, there is provided the image forming apparatus according to any one of the first to sixth aspects, wherein the predetermined material is an adsorbent material.

  The invention according to claim 8 provides the image forming apparatus according to claim 1, wherein the predetermined material is coated paper or art paper.

  According to a ninth aspect of the present invention, the heating control of the heating unit is stopped after the end of an image forming job for feeding sheets from the stacking unit provided with the blower unit. The image forming apparatus according to any one of 6 is provided.

  According to a tenth aspect of the present invention, when a stacking unit not provided with the blowing unit is selected after completion of an image forming job for feeding sheets from the stacking unit provided with the blowing unit, the heating is performed. 6. The image forming apparatus according to claim 2, wherein the heating control of the means is stopped.

  According to an eleventh aspect of the present invention, the blower is operated for a predetermined time after the end of the image forming job after the stacking unit not provided with the blower is selected. The image forming apparatus according to 5 is provided.

  According to a twelfth aspect of the present invention, when the loading means not provided with the air blowing means is selected, the air blowing means is operated for a predetermined time every predetermined time. An image forming apparatus is provided.

  According to any one of the first to sixth aspects, the sheet on the stacking unit can be blown with warm air in a short time after an instruction to start image formation is input while suppressing the power consumption of the heating unit as much as possible. It becomes possible.

  According to the seventh aspect of the present invention, it becomes possible to start the heating control of the heating means when it is determined that the sheet having the adsorptive material is fed from the stacking means.

  According to the eighth aspect of the invention, it becomes possible to start the heating control of the heating means when it is determined that the paper is fed from the stacking means on which the coated paper or the art paper is stacked.

  According to the ninth or tenth aspect of the present invention, the power consumption of the heating unit can be suppressed by stopping the heating control of the heating unit after the end of the image forming job.

  According to the invention of claim 11 or 12, even if the stacking means not provided with the blowing means is selected, auxiliary sheeting is performed on the sheet on the stacking means provided with the blowing means. Thus, it is possible to reliably separate the sheets when the stacking unit provided with the next blowing unit is selected.

(overall structure)
FIG. 1 is a cross-sectional view showing the configuration of the main part of an embodiment of a copying machine according to the present invention. As shown in FIG. 1, the copying machine includes an image reader 200 that reads a document image, a printer 300, and a paper feeding unit 400. The paper feeding unit 400 includes paper decks 401 and 451 having a common paper feeding mechanism. The paper deck 401 can accommodate 1000 sheets, and the paper deck 451 can accommodate 1500 sheets. The paper feed unit 400 will be described in detail later.

  A document feeder 100 is mounted on the image reader 200. The document feeder 100 feeds documents set upward on the document tray to the left one by one in order from the first page, flows on the platen glass 102 from the left through a curved path, and passes through the reading position. The paper is conveyed to the right and then discharged toward the external paper discharge tray 112. When the original passes through the sink reading position on the platen glass 102 from the left to the right, the original image is read by the scanner unit 104 held at a position corresponding to the sink reading position. This reading method is generally referred to as document scanning. Specifically, when the original passes through the reading position, the original reading surface is irradiated with the light from the lamp 103 of the scanner unit 104, and the reflected light from the original passes through the mirrors 105, 106, and 107 to the lens. To 108. The light that has passed through the lens 108 forms an image on the imaging surface of the image sensor 109.

  By transporting the document so that it passes through the flow reading position from the left to the right in this way, the document reading scan in which the direction orthogonal to the document transport direction is the main scanning direction and the transport direction is the sub-scanning direction Done. That is, the entire original image is read by conveying the original in the sub-scanning direction while reading the original image by the image sensor 109 line by line in the main scanning direction when the original passes through the reading position. The read image is converted into image data by the image sensor 109 and output. Image data output from the image sensor 109 is input as a video signal to the exposure control unit 110 of the printer 300 after predetermined processing is performed in an image signal control unit 202 described later.

  It is also possible to read the document by transporting the document onto the platen glass 102 by the document feeder 100 and stopping it at a predetermined position, and scanning the scanner unit 104 from left to right in this state. This reading method is a so-called fixed original reading method.

  When reading a document without using the document feeder 100, the user first lifts the document feeder 100 to place the document on the platen glass 102, and then scans the scanner unit 104 from left to right. The original is read by. That is, when reading a document without using the document feeder 100, a fixed document reading is performed.

  The exposure control unit 110 of the printer 300 modulates and outputs a laser beam based on the input video signal, and the laser beam is irradiated onto the photosensitive drum 111 while being scanned by a polygon mirror. An electrostatic latent image corresponding to the scanned laser beam is formed on the photosensitive drum 111. Here, as will be described later, the exposure control unit 110 outputs a laser beam so that a correct image (an image that is not a mirror image) is formed during document fixed reading.

  The electrostatic latent image on the photosensitive drum 111 is visualized as a developer image by a developer supplied from a developing device (not shown). In addition, at a timing synchronized with the start of laser light irradiation, a sheet is fed from each of the cassettes 114 and 115 or the double-sided conveyance path 124, and the sheet is conveyed between the photosensitive drum 111 and the transfer unit 116. The developer image formed on the photosensitive drum 111 is transferred onto the paper fed by the transfer unit 116.

  The sheet on which the developer image has been transferred is conveyed to the fixing unit 117, and the fixing unit 117 heats and presses the sheet to fix the developer image on the sheet. The sheet that has passed through the fixing unit 117 is discharged to the first discharge tray 119 via the first discharge roller 118 or the second discharge tray 121 via the first discharge roller 118 by switching a flapper (not shown).

  FIG. 2 is a perspective view of an air paper feeding type paper deck 401 in the present embodiment. The paper deck 401 is configured to stack and store sheet bundles on an intermediate plate 403 provided in the storage 402. Rails 404 and 405 are provided at the lower edge portions on both sides of the storage 402 and can be pulled out from the apparatus main body. The storage box 402 is held at the paper feed position by a latch (not shown), and when the opening switch 20 shown in FIG. 4 is pressed, the latch is released and the storage box 402 can be pulled out. Become.

  The sheet bundle loaded and stored in the storage 402 is held at a predetermined position by a pre-separation plate 406 at the front end, a rear end restricting plate 412 at the rear end, and side restricting plates 410 and 411 at the side end. ing.

  Above the sheet bundle, there is provided a suction duct 408 that is connected to suction means (not shown) and can generate a suction static pressure above the sheet bundle, and an adsorption belt 407 having a plurality of holes so as to surround the suction duct 408. It is arranged so that paper can be rotated in the paper feeding direction.

  Next, the sheet rolling mechanism provided in the side regulating plate 410 will be described in detail with reference to FIG. FIG. 3 is a cross-sectional view of the sheet rolling mechanism when the paper deck 401 shown in FIG. 2 is viewed from the sheet feeding direction. A heater 14 and a fan 417 shown in FIG. 4 are provided inside the side regulating plate 410. The blowing duct 413 has an opening 414 for blowing air toward the side surface of the sheet bundle loaded and stored in the storage 402. A swing shutter 415 that is movable in a substantially vertical direction is provided between the sheet bundle side surface and the opening 414. A part of the swing shutter 415 is formed with a slit 416 having a vertical width sufficiently smaller than the vertical width of the opening 414. The sensor 418 detects a state where the swing shutter 415 is at the highest position. A heater 14 is attached in the blowing duct 413. The heater 14 starts heating control when a sheet of a predetermined material, for example, coated paper is selected, and is heated by the heater 14 when the inside of the storage is in a high humidity state. The moisture absorption state is relaxed by blowing the air on the sheet bundle loaded and stored. Further, as will be described later, the temperature control temperature (target temperature) of the heater 14 is changed according to the temperature and humidity conditions in the storage, or the energization of the heater 14 is cut off.

  Further, since the paper deck 451 does not include the fan 417 and the heater 14, special sheets such as art paper and coated paper cannot be fed.

  FIG. 4 is a diagram showing the configuration of the paper deck 401. The paper sensor 8 detects paper conditions, specifically, the paper thickness, density, and size, and sends information to the control unit 16. Instead of the paper sensor 8, a configuration in which the user inputs information related to the paper from the operation unit shown in FIG. The temperature sensor 9 and the humidity sensor 10 detect the temperature and humidity inside the deck 4 and send this information to the control unit 16.

  Reference numeral 417 denotes a fan that blows warm air around the top paper 6 to prevent double feeding of coated paper or the like. The swing shutter 415 moves reciprocally in the vertical direction, for example, and spreads the sheet 7 by partially blocking or passing the warm air from the fan 417. The swing shutter 415 is driven by a swing motor (not shown).

  The blowing duct 413 has a heater 14 inside, and in the case of this embodiment, air is taken in from below and the air heated by the heater 14 is exhausted by the fan 417. The heater 14 is supplied with the AC voltage 18 by the control unit 16 via the on / off control of the SSR 17, for example, the resistor generates heat and warms the air sucked from below. The heater temperature sensor 15 contacts the heater 14 and sends information related to the temperature of the heater 14 to the control unit 16. In addition, a thermo switch 21 is provided in the duct 413 to cut off the energization of the heater 14 when the temperature becomes abnormal. Based on the information from the heater temperature sensor 15, the control unit 16 performs temperature control control so that the temperature of the heater 14 becomes a constant value through on / off control of the AC voltage 18 and SSR (solid state relay) 17. Do.

  In the above configuration, the operation from when the heater 14 starts temperature adjustment, the sheet 7 is rolled, and the pickup roller 5 starts feeding will be described. First, the temperature and humidity information sent from the temperature sensor 9 and the humidity sensor 10 to the control unit 16, and the paper conditions sent from the paper sensor 8 to the control unit 16, specifically, the paper thickness, density, The optimum target heater temperature is determined based on the size information.

  In the present embodiment, the target heater temperature is determined using the chart shown in FIG. For example, when the paper sensor 8 indicates coated paper, the temperature sensor 9 indicates 25 ° C., and the humidity sensor 10 indicates 70%, the optimum target heater temperature is 90 ° C. When the information from the heater temperature sensor 15 is 90 ° C. or lower, the control unit 16 turns on the SSR 17 and energizes the heater 14 to increase the temperature. On the contrary, when the information is 90 ° C. or higher, the controller 16 turns off the SSR 17 14 is not energized. If the paper sensor 8 selects uncoated paper, the heater 14 is not energized. That is, the control unit 16 continues the state where the SSR 17 is turned off.

  The paper deck 401 may be a roller paper feeding method in addition to the air paper feeding method. The paper deck 401 is incorporated in the frame of the image forming apparatus as shown in FIG. 1, but may be mounted outside the image forming apparatus.

  Here, when the user presses the key 301 on the operation screen illustrated in FIG. 6 of the operation unit 30, the paper deck 401 (deck 1) is selected as the paper feed unit, and the user displays the operation screen illustrated in FIG. When the key 302 is pressed, a special paper (for example, coated paper) is selected as the material of the sheet, and when the condition described with reference to FIG. Without waiting for the button to be pressed, the control unit 16 starts the temperature control of the heater 14. Regarding the environmental conditions, for example, as shown in FIG. 5, when the temperature condition is 50 ° C. or less and the humidity condition is 40 to 60% in the storage, the temperature adjustment temperature of the heater 14 is set to 60 ° C. Is 50 ° C. or less and the humidity condition is 60% or more, the temperature control temperature of the heater 14 is controlled to be 90 ° C. setting. In addition, when the other environmental conditions and uncoated paper are selected as the sheet material, the heater 14 is not energized.

  When the heater 14 reaches the target temperature, the printer 300 transitions from the standby state to the ready state. If the copy start key of the operation unit 30 is pressed, the control unit 16 starts the paper feeding operation. In performing the sheet feeding operation, first, the suction operation of the upper suction unit is started, and the air heated by the heater 14 is blown against the side surface of the sheet bundle by operating the fan 417. The swing shutter 415 is reciprocated up and down by a drive source (not shown). The swing shutter 415 is positioned at the lowest position when the operation is started, and air is blown out from the entire opening 414 (FIG. 3A). Next, the swing shutter 415 moves upward, and the slit 416 also moves upward. As the swing shutter 415 rises, the wind speed of the air discharged from the slit 416 increases.

  This is because when the swing shutter 415 is at the lowest position, air is discharged from the entire opening 414, and the swing shutter 415 is lifted to block a part of the opening 414, and the swing shutter 415 of the opening 414 Air is discharged from the unblocked portion and the slit 416, and when the swing shutter 415 approaches the uppermost position, air is discharged only from the slit 416, and the area of the discharge surface of the air discharged from the duct 413 is small. It is to become.

  Since the air passing through the slit 416 having a high wind velocity is blown onto the side surface of the sheet bundle while continuously moving upward, a better rolling effect can be expected than the conventional steady flow air (FIGS. 3B and 3C). Further, when the swing shutter 415 reaches the uppermost position, the blowing duct opening 414 is completely blocked, so that all the sheet bundles lifted by the blowing air are dropped, and only the uppermost sheet is adsorbed by the adsorption belt 407. (FIG. 3D). When the slit 416 is positioned above the opening 414 and the swing shutter 415 completely blocks the opening 414, the suction belt 407 is driven to rotate. Thereby, the uppermost sheet can be reliably separated and fed one by one. Therefore, it is possible to expect good sheet rolling and prevention of sheet double feeding.

  Further, when feeding a sheet that is likely to cause an adsorption phenomenon such as art paper or coated paper under high humidity, the swing shutter 415 may be moved up and down several times as an operation before feeding. For example, as described above, when the sheet suction cannot be solved only by the one-way rolling operation from the lowest position to the highest position of the swing shutter 415 (FIG. 3 (a) → (d)), the reciprocating movement operation (FIG. 3 (a) ) → (d) → (a)) is performed a plurality of times, and then the one-way rolling operation is performed, so that the suction can be released by reliably flowing air between the sheets of the sucked sheet bundle. 3D, the blown air is shut off at the time of feeding, so that only the uppermost paper is adsorbed to the suction belt 407, and other than the uppermost paper falls by its own weight. Therefore, the uppermost paper adsorbed to the adsorption belt 407 It is possible to prevent only double feeding.

  In the above description, the initial position of the swing shutter 415 is the lowest position, but the position is not limited to this and may be an arbitrary position. The suction means and the blowing means may be a fan such as a sirocco fan or a compressor.

  In the operation screen shown in FIG. 8 of the operation unit 30, the power saving mode is selected (the Yes key is pressed), and in the operation screens shown in FIGS. 6 and 7, the paper deck 401 uses the thick paper (or the thickest paper) (deck 1 key 301 is pressed and thick paper key 302 is pressed), and a special paper (for example, coated paper) paper feed job is selected (coated paper key 303 is pressed). When the paper deck 451 is selected in the next image forming job (the deck 2 key is pressed), the power supply to the heater 14 of the paper deck 401 is controlled to be released.

  In addition, the power saving mode is selected on the operation screen shown in FIG. 8, and further, the operation screen shown in FIGS. 6 and 7 is a thick paper (or thickest paper) and special paper (for example, coated paper) feed job from the paper deck 401. After completion of the above, control is performed to release the energization of the heater 14.

  Further, after the power saving mode is selected in the operation unit shown in FIG. 8 and the job in which feeding of thick paper (or thickest paper) and coated paper is selected from the paper deck 401 shown in FIGS. Subsequently, when the paper deck 451 is selected, every time a paper feed job from the paper deck 451 is completed, the sheets stacked on the paper deck 401 are rolled for a predetermined time, or the sheet bundle is rolled at a predetermined time interval. Control to do.

(Explanation of flowchart)
Next, the description after the power saving mode is set will be described with reference to the flowcharts of FIGS. FIG. 9 is a flowchart showing a series of processes when the power saving mode is set from the operation screen shown in FIG. The power saving mode is set (S101), the deck 1 (paper deck 401) having the heater 14 is selected from the operation screen shown in FIG. 6 (S102), and the sheet material is selected from the operation screen shown in FIG. When thick paper (or thickest paper) and coated paper are selected (S103), temperature control for the heater 14 is started according to the temperature and humidity conditions shown in FIG. 5 (S104). Note that it is assumed that the temperature control control conditions of the heater 14 shown in FIG. Further, the cardboard shown in the present embodiment represents a sheet having a basis weight of 106 g (grams) or more and 163 g or less, and the thickest paper represents a sheet of 164 g or more.

  After energization of the heater 14 is started (S110), when the heater 14 reaches a certain temperature, the heater 14 becomes ready (S105), and the image forming apparatus starts an image forming operation (copying operation) ( S106). The predetermined temperature here is set to a temperature lower than the heater temperature adjustment temperature. When the image forming job using the deck 1 (paper deck 401) is completed (S107), the temperature control of the heater 14 is stopped, that is, the power supply to the heater 14 is cut off (S108).

  If the heater 14 does not reach the predetermined temperature even after a predetermined time has elapsed since the start of the heater temperature adjustment (S110), it is determined that the heater 14 has an error (s111), and an error display regarding the heater is displayed on the operation unit 30. It performs (S112).

  Further, even when the power saving mode is set from the operation screen shown in FIG. 8 (S101), when the deck 2 (paper deck 451) that does not include the heater 14 is selected from the operation screen shown in FIG. 6 (S102, In S109, the image forming apparatus immediately starts an image forming operation (S106), and the heater 14 attached to the deck 1 (paper deck 401) is not energized.

  Further, even when the power saving mode is set from the operation screen shown in FIG. 8 (S101) and the deck 1 (paper deck 401) having the heater 14 is selected from the operation screen shown in FIG. 6 (S102), FIG. When plain paper is selected as the sheet material from the operation screen shown (S103), the image forming apparatus immediately starts an image forming operation (S106), and the heater 14 attached to the deck 1 (paper deck 401). Is not energized.

  FIG. 10 is a diagram showing processing different from that in FIG. 9 when the power saving mode is set from the operation screen shown in FIG. The power saving mode is set, and the deck 1 (paper deck 401) having the heater 14 is selected from the operation screen shown in FIG. 6, and the sheet material is thick paper (or the thickest paper) and coated from the operation screen shown in FIG. When paper is selected (S201), energization of the heater 14 is started in accordance with the temperature and humidity conditions shown in FIG. 5, and an image forming job is performed after the image forming apparatus is ready. After the end of the image forming job (S202), when the deck 2 (paper deck 451) that does not include the heater 14 is selected from the operation screen shown in FIG. 6 in the next job (S203, S205), the heater 14 is energized. Is controlled to be disconnected (S206). When the next job is set (S207), the image forming apparatus immediately starts an image forming operation (S208). After the completion of the image forming job from the deck 2 (paper deck 451) (S209), the air blowing means of the deck 1 (paper deck 401) including the heater 14 is operated for a predetermined time (S210), and the sheets in the deck 1 are reserved. Control to whisper.

  Note that the presence / absence of preliminary sheet rolling may be changed according to the material and environmental conditions of the stored sheet. Further, when the deck 2 (paper deck 451) that does not include the heater 14 is selected as the next job, the air blowing means of the deck 1 (paper deck 401) that includes the heater 14 is turned on for a predetermined time each time the job ends. And control so that the sheets in the deck 1 are preliminarily rolled. However, if there is no sheet in the deck 1, preliminary rolling is not performed.

  Further, if the deck 2 (paper deck 451) that does not include the heater 14 is not selected from the operation screen shown in FIG. 6 in the next job (S203), the heater 14 is controlled not to cut off the power supply (S204). .

  As shown in FIG. 11, when the deck 2 (paper deck 451) that does not include the heater 14 is selected in the next job (S303, S305), the heater 14 attached to the deck 1 (paper deck 401) is moved to. Is controlled so as to be cut off (S306), and the air blowing means of the deck 1 (paper deck 401) including the heater 14 is operated for a predetermined time every predetermined time (S307) to reserve the sheets in the deck 1 Control to whisper. However, if there is no sheet in the deck 1, preliminary rolling is not performed. Steps S301, S302, and S304 are the same as steps S201, S202, and S204, respectively, and thus description thereof is omitted.

1 is a cross-sectional view of a copier according to an embodiment of the present invention. 1 is a perspective view of a paper deck provided in a copying machine. It is a figure explaining the sheet rolling mechanism of a paper deck. It is a figure explaining the structure of a paper deck. It is a figure explaining the electricity supply conditions to a heater. It is a figure showing the operation screen of a copying machine. It is a figure showing the operation screen of a copying machine. It is a figure showing the operation screen of a copying machine. It is a flowchart which concerns on the heater control of this embodiment. It is a flowchart which concerns on the heater control of this embodiment. It is a flowchart which concerns on the heater control of this embodiment.

Explanation of symbols

7 Paper 14 Heater 16 Control unit 30 Operation unit 300 Printer 401 Paper deck 413 Duct 417 Fan 451 Paper deck

Claims (12)

A stacking means for stacking sheets;
A feeding means for feeding sheets from the stacking means;
Image forming means for forming an image on the sheet fed by the feeding means;
A blowing means for blowing air to the sheets stacked on the stacking means;
Heating means for heating air blown by the blowing means;
Setting means for setting the material of the sheets stacked on the stacking means;
An instruction input means for inputting an instruction to start image formation;
Control that starts heating control of the heating unit without waiting for a start instruction from the instruction input unit when a predetermined material is set by the setting unit and image formation is performed on the sheet fed from the stacking unit Means,
An image forming apparatus comprising: A plurality of stacking means for stacking sheets;
A feeding means for feeding a sheet from any of the plurality of stacking means;
Image forming means for forming an image on the sheet fed by the feeding means;
A blowing unit for blowing air to the sheets stacked on at least one of the plurality of stacking units;
Heating means for heating air blown by the blowing means;
Setting means for setting the material of the sheets stacked on the stacking means provided with at least the blowing means among the plurality of stacking means;
An instruction input means for inputting an instruction to start image formation;
A selection unit that selects a stacking unit on which sheets to be fed are stacked among the plurality of stacking units;
When the loading means provided with the air blowing means is selected by the selection means and a predetermined material is set by the setting means, the heating means is controlled without waiting for a start instruction from the instruction input means. Control means to start;
An image forming apparatus comprising: A stacking means for stacking sheets;
A feeding means for feeding sheets from the stacking means;
A blowing means for blowing air to the sheets stacked on the stacking means;
Heating means for heating air blown by the blowing means;
In an image forming apparatus capable of connecting a sheet feeding apparatus having
Image forming means for forming an image on the sheet fed by the feeding means;
Setting means for setting the material of the sheets stacked on the stacking means;
An instruction input means for inputting an instruction to start image formation;
Control that starts heating control of the heating unit without waiting for a start instruction from the instruction input unit when a predetermined material is set by the setting unit and image formation is performed on the sheet fed from the stacking unit Means,
An image forming apparatus comprising: A stacking means for stacking sheets;
A feeding means for feeding sheets from the stacking means;
Image forming means for forming an image on the sheet fed by the feeding means;
A blowing means for blowing air to the sheets stacked on the stacking means;
Heating means for heating air blown by the blowing means;
Detecting means for detecting the material of the sheets stacked on the stacking means;
An instruction input means for inputting an instruction to start image formation;
Control that starts heating control of the heating unit without waiting for a start instruction from the instruction input unit when a predetermined material is detected by the detection unit and image formation is performed on a sheet fed from the stacking unit Means,
An image forming apparatus comprising: A plurality of stacking means for stacking sheets;
A feeding means for feeding a sheet from any of the plurality of stacking means;
Image forming means for forming an image on the sheet fed by the feeding means;
A blowing unit for blowing air to the sheets stacked on at least one of the plurality of stacking units;
Heating means for heating air blown by the blowing means;
Detecting means for detecting the material of the sheets stacked on the stacking means provided with at least the blowing means among the plurality of stacking means;
An instruction input means for inputting an instruction to start image formation;
A selection unit that selects a stacking unit on which sheets to be fed are stacked among the plurality of stacking units;
When the loading means provided with the air blowing means is selected by the selection means and a predetermined material is detected by the detection means, the heating means is controlled without waiting for a start instruction from the instruction input means. Control means to start;
An image forming apparatus comprising: A stacking means for stacking sheets;
A feeding means for feeding sheets from the stacking means;
A blowing means for blowing air to the sheets stacked on the stacking means;
Heating means for heating air blown by the blowing means;
Detecting means for detecting the material of the sheets stacked on the stacking means;
In an image forming apparatus capable of connecting a sheet feeding apparatus having
Image forming means for forming an image on the sheet fed by the feeding means;
An instruction input means for inputting an instruction to start image formation;
Control that starts heating control of the heating unit without waiting for a start instruction from the instruction input unit when a predetermined material is detected by the detection unit and image formation is performed on a sheet fed from the stacking unit Means,
An image forming apparatus comprising:   The image forming apparatus according to claim 1, wherein the predetermined material is an adsorbent material.   The image forming apparatus according to claim 1, wherein the predetermined material is coated paper or art paper.   The image forming apparatus according to claim 1, wherein heating control of the heating unit is stopped after completion of an image forming job for feeding sheets from the stacking unit provided with the blowing unit. .   The heating control of the heating unit is stopped when a stacking unit not provided with the blowing unit is selected after an image forming job for feeding sheets from the stacking unit provided with the blowing unit is completed. The image forming apparatus according to claim 2 or 5.   6. The image forming apparatus according to claim 2, wherein the air blowing unit is operated for a predetermined time after the end of the image forming job after the stacking unit not provided with the air blowing unit is selected.   6. The image forming apparatus according to claim 2, wherein when a stacking unit not provided with the blowing unit is selected, the blowing unit is operated for a predetermined time every predetermined time.

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