JP3854431B2 - Sheet feeding device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sheet feeding apparatus that feeds stacked sheets, and more particularly to a feeding apparatus that separates and feeds sheets having high adhesion between sheets.
[0002]
[Prior art]
In image forming apparatuses such as printers and copiers, generally, a cut sheet that enables continuous feeding is used as a medium on which an image is formed, and these sheets (paper) have conventionally been copied. Ordinary paper or high-quality paper specified by the machine manufacturer was used. Since these sheets have low surface smoothness, the inter-sheet adhesion is low, and even when sheets are fed one by one from a paper stacking unit such as a paper feed tray, multiple sheets are supplied in close contact with each other. It was relatively easy to prevent. However, in recent years, with the diversification of recording media, it has become necessary to transport various types of sheets, including those with high surface smoothness. In particular, whiteness has increased as colorization technology has advanced. There is also a high demand for conveying the same type of glossy coated paper, film sheet, tracing paper, and other glossy paper. Glossy paper such as coated paper, film sheets, and tracing paper has strong adhesion between the sheets, so that it is difficult to prevent double feeding, and special measures are required for sheet supply.
[0003]
For example, a coated paper will be described as an example. As the coated paper becomes higher in quality, the coating amount increases and the white glossiness, which is an optical property, increases, and the surface roughness of the base paper decreases and the surface smoothness increases. Become. On the other hand, when the surface smoothness becomes high, the gap between the papers when they come into contact with each other becomes narrower, and the negative pressure generated in a state where air does not pass through the gap is maintained, and the adhesion between the sheets (between the sheets) is maintained. Become stronger. In particular, when smooth sheets such as coated paper are stacked in a high-humidity environment, the sheets are adsorbed and the degree of adhesion becomes higher. Film sheets and tracing paper also have high surface smoothness and high adhesion between sheets.
[0004]
When such smooth sheets with strong adhesion between sheets are fed out one by one from the paper feed tray on which the sheets are stacked, they are separated and conveyed one by one with the normal plain paper feeding device. It becomes very difficult to do. In particular, a sheet feeding device using a pull-in roll that pulls a sheet by rotating in contact with the surface of the sheet with a predetermined pressing force, and a system that presses and separates a supply roll and a separation roll at a constant pressure when the sheet is rolled. Then, when the smooth sheet is separated and conveyed, a pressing force that is about 30 times that of normal plain paper is required. As a method for eliminating such adhesion to a smooth sheet in advance, the present applicant has proposed a technique for blowing air from the side surface of a stacked sheet in Japanese Patent Application Laid-Open No. 11-5643. According to this technique, a great effect can be achieved in eliminating the adhesion force in the smooth sheet.
[0005]
[Problems to be solved by the invention]
In this way, the smooth sheet conveying performance can be dramatically improved by the technique of feeding air after blowing air from the side of the sheet to release the contact, but with the technique disclosed in Japanese Patent Laid-Open No. 11-5543, Since air is blown regardless of the type, wasteful energy is consumed when feeding plain paper that does not require air blowing, which is not preferable.
[0006]
Further, glossy paper such as coated paper has a friction coefficient between sheets of about 0.3, while plain paper has a high frictional force between sheets and a friction coefficient of 0.5 to 0.8. For this reason, when air is blown against plain paper, there is no inter-sheet resistance with respect to the gap between the sheets. For example, if a sheet is supplied by a friction roll such as a pull-in roll (pickup roll), the supply Paper speed increases rapidly. As a result, a plurality of sheets rush into the downstream sheet-rolling portion at a high speed, and there is a problem that the sheets are not sufficiently wound and are conveyed in a double feed.
[0007]
[Means for Solving the Problems]
In order to solve the above technical problems, the sheet feeding apparatus of the present invention is provided on the sheet conveying direction side of the sheet accommodating means 1 for accommodating various sheets P as shown in FIG. Sheet having a conveying roll and a rolling roll that are in pressure contact with each other at a pressure set to convey the sheet P made of plain paper, and feeding and conveying the sheet P one by one from between these rolls Air is blown against the supply means 2 and the sheet P accommodated in the sheet accommodation means 1, and the sheets P are spread one by one upstream from the pressure contact portion between the conveyance roll and the rolling roll. and air blowing means 3 into a state, a plurality of sheet type comprising a plain paper and glossy paper is specifiable displayed, the sheet type specifying means 4 for designating one of the sheet type, sheet type Recognizing the type of a given sheet at a constant unit 4, on the basis of the recognition result, for the consist plain paper sheet P, and prohibits the air blowing by the air blowing unit 3 and the sheet feeding means 2 The sheet P is rolled and conveyed one by one, while the sheet P made of glossy paper is blown by the air blowing means 3 to be turned one by one and the sheet supply means 2 and a control means 5 for conveying the sheets one by one .
[0008]
In such technical means, as a typical mode of the control means 5, for example, it is recognized whether or not the sheet P stored in the sheet storage means 1 is glossy paper (for example, coated paper), and glossy paper (for example, coated paper) is recognized. An embodiment in which air blowing by the air blowing means 3 is executed by recognizing the (work paper) is mentioned.
At this time, in the aspect using the sheet type designation means 4 , the sheet type designation means 4 designates whether or not the sheet accommodated in the sheet accommodation means 1 is glossy paper, and the air blowing means 3 designates the sheet type designation means 4. When the glossy paper is designated by the above, air blowing is executed .
For this reason, it becomes possible to stop air blowing on the sheet P such as plain paper that does not require air blowing, and secondary troubles caused by blowing air to the sheet P that does not require air blowing can be prevented. It is preferable because it can be performed. Here, the glossy paper designated by the sheet type designation means 4 includes coated paper, film sheets, tracing paper, and the like, and is distinguished from plain paper .
Further, as another aspect of the control means 5, the sheet P accommodated in the sheet accommodation means 1 recognizes whether it is a slippery sheet or a rough sheet, and when the slippery sheet is recognized, the air blowing means 3 performs air blowing. The aspect which recognizes the basic weight of the sheet | seat P accommodated in the sheet | seat accommodation means 1, and performs the air spraying by the air spraying means 3 based on the basic weight of this sheet | seat P is mentioned.
[0009]
Further, if the sheet type designation means 4 is designated by the user with the paper type selection switch 6, the sheet feeding device can control the air blowing according to the type of the sheet P. The sheet P can be supplied in a stable state. As the type of the sheet P, in addition to the paper type such as coated paper, film, plain paper, etc., the surface state of the sheet (smooth or rough), the basis weight of the sheet, thickness information such as cardboard or thin paper, etc. It is possible to configure so that it can be selected with arbitrary contents. Further, as the paper type selection switch 6, if a switch using a touch sensor provided on the liquid crystal display panel is employed in addition to a switch using a button or the like, it becomes possible to select a paper type by switching the display. This is preferable because the space can be reduced.
[0010]
Further, when the sheet supply apparatus is, for example, a printer that is an image forming apparatus, the sheet type designation unit 4 is based on the designation of the type of the sheet P by a user from a personal computer or the like connected by a cable such as a net. It is also possible to configure so that the type of sheet P is designated. In such a case, the sheet type designation means 4 of the sheet feeding apparatus according to the present invention is not necessarily limited to a hardware configuration such as a switch, and corresponds to a configuration that recognizes instruction information from a personal computer or the like.
[0011]
Furthermore, the control of the air spraying means 3 by the control means 5 can be performed only on the necessary types of sheets as long as ON / OFF of the air spraying is controlled based on the specification by the sheet type specifying means 4. Is preferable because it can be sprayed. The air blowing ON / OFF control is provided in the air blowing means 3, for example, other than the one that controls the ON / OFF of the motor if the air blowing means 3 uses a fan by rotation of the motor. It is also possible to switch on and off the blowing by switching the shutter of the duct.
Further, the control of the air blowing means 3 by the control means 5 is not limited to ON / OFF of air blowing, but includes various controls relating to air blowing. In addition to controlling the air amount, controlling the blowing angle and direction, The flow temperature / humidity condition control, intermittent spray time interval control, and the like can be executed.
[0012]
Further, in the sheet feeding apparatus of the present invention, the air blowing unit 3 is, with respect to the sheet between the friction coefficient is low sheet P performs air blowing, perform the air blowing against the sheet between the friction coefficient is high sheet P If it is characterized by not, the adhesion of the sheet P can be eliminated by air blowing, and the trouble of increasing the sheet supply speed by air blowing can be prevented for the sheet P having a high inter-sheet friction coefficient. .
[0013]
Next, the operation of the technical means described above will be described.
Air blowing means 3 for blowing air to the sheets P stacked on the sheet storage means 1 is provided, and the air blowing means 3 is controlled by the control means 5 for ON / OFF of air blowing, for example. Further, in the sheet supply apparatus, for example, a sheet type designation unit 4 is provided on a control panel or the like on the outer wall of the apparatus, and control by the control unit 5 is executed based on designation information of the sheet type designation unit 4. The sheet type designation means 4 is provided with a paper type selection switch 6 for designating the type of the sheet P. By switching the paper type selection switch 6, the user of the sheet supply apparatus can perform, for example, coating. It is possible to specify glossy paper such as paper and plain paper.
[0014]
For example, when coated paper is selected by the paper type selection switch 6, the control means 5 receives the information and starts the operation of the air blowing means 3, and applies the sheet P loaded on the sheet storage means 1 to the sheet P. For example, air is blown from the side surface. On the other hand, when plain paper is selected by the paper type selection switch 6, the control means 5 receives this information and prohibits the operation of the air blowing means 3, and does not perform air blowing. By such a switching operation by the control means 5, it becomes possible to blow air only on the sheet P having a high sheet-to-sheet adhesion degree, and optimal sheet supply according to the type of the sheet P can be performed.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail based on preferred embodiments shown in the accompanying drawings.
FIG. 2 shows an embodiment of an image forming apparatus to which the present invention is applied. In FIG. 1, an image forming apparatus 21 serving as a sheet supply apparatus is connected to an external device 25 such as an image reading apparatus (IIT) 23 for reading a document image and a personal computer (PC) via a communication line 27. 29, and an image recording control unit 33 for controlling the image writing device 31 based on the image information from the receiving unit 29 is provided. In addition to the control of the image writing device 31, the image recording control unit 33 also performs control of a sheet supply unit 60 described later, control of an air blowing device 71, and control of other sheet conveyance systems. Further, the image forming apparatus 21 is arranged along the circumferential direction of the image carrier 35 on which an electrostatic latent image is written by the image writing device 31 and charges the image carrier 35. And a developing device 39 that develops toner using the toner on the charged image carrier 35, and transfers the toner image on the image carrier 35 to the sheet conveyed by the transfer roller 43. ing. Further, a fixing device 45 for fixing the image transferred to the sheet, a discharge roller 47 for discharging the fixed sheet, a discharge tray 49 for stacking the sheets discharged by the discharge roller 47, and not used for transfer. And a cleaner 41 for collecting excess toner.
In addition, a control panel (operation panel) 100 that enables various operations by a user (user) of the image forming apparatus 21 is provided on the outer wall portion of the image forming apparatus 21 in the present embodiment.
[0016]
Furthermore, the image forming apparatus 21 is provided with a plurality of (four in the present embodiment) sheet supply trays 59 for storing sheets according to size or sheet feeding direction, and these sheet supply trays. 59 is configured such that a bottom plate (not shown) provided therein moves up and down by driving a motor (not shown). A sheet supply unit 60 is provided above the sheet supply tray 59, and comes into contact with the upper surface of the sheet raised by the bottom plate to separate and convey the sheet. The separated and conveyed sheet is imaged via the sheet conveyance unit 51. It is conveyed to an image forming unit made up of a carrier 35 and the like. Each sheet supply tray 59 is provided with an air blowing device 71 that blows air against the side surface of the sheet.
[0017]
FIG. 3 is a perspective view showing the sheet supply unit 60. The sheet supply unit 60 is brought into frictional contact with the upper surface of the stacked sheets P to draw out the sheets P in order, and the sheet P fed out from the pull-in roll 61 is rolled and conveyed toward the downstream portion. A transport roll (feed roll) 62 is provided, and a sheet roll P (retard roll) 63 is provided to roll the sheets P one by one while being pressed by the transport roll 62. Here, the drawing roll 61, the conveying roll 62, and the separating roll 63 are configured to have the same shape and the same size as each other, and are configured to execute the conveying action of the sheet P by frictional contact with the sheet P. Is done.
The transport roll 62 is driven by receiving power from a feed motor (not shown) via a drive gear (not shown) and a feed clutch. On the other hand, the pull-in roll 61 is configured to rotate via an arm 81 with the shaft 62 a of the transport roll 62 as a rotation center, and rotates in conjunction with driving of the transport roll 62 by gears 82. Further, the pull-in roll 61 is dropped onto the upper surface of the sheet P via the link 84 by the operation of the solenoid 83 that operates in response to the drive signal from the image recording control unit 33, and rotates with a predetermined pressing force. By driving, the sheet P can be fed out. Further, the movement of the arm 81 is detected by the photo sensor 85 and controlled so that the height of the sheet P falls within a certain range.
Further, the rolling roll 63 is brought into contact with the transport roll 62 with a weak pressure by a spring 89 via a support 88 having a pivot 87 as a rotation center. Further, the winding roll 63 is connected to a first gear 91 and a fixed second gear 92 that rotate via a torque limiter 90 provided on the shaft 63a.
[0018]
FIG. 4 is a plan view of the sheet supply tray 59. An end guide 65 that regulates a rear end surface of the sheet P in the sheet feeding direction is provided on the upstream side of the sheet supply tray 59 in the sheet feeding direction, and a side surface fixed guide 67 is provided on a side surface in a direction orthogonal to the sheet feeding direction. A side movable guide 69 configured to be movable according to the size of the sheet P is disposed at the opposed position. An air blowing device 71 is disposed in the vicinity of the side fixed guide 67 so that air is blown onto the sheet P through an air outlet 73 provided in the side fixed guide 67. The air blowing device 71 is provided with a FAN that rotates in the direction of the arrow in the drawing so that high-pressure air can be supplied.
[0019]
FIG. 5 is a schematic explanatory view showing the sheet supply tray 59 from the side. As described above, the drawing roll 61 in the sheet supply unit 60 is in contact with the upper surface of the sheets P stacked on the sheet supply tray 59 and acts to sequentially feed the sheets P. Further, the sheet P fed out from the pulling roll 61 passes through the separating section constituted by the conveying roll 62 and the separating roll 63, and even when two or more sheets P are unrolled and fed out, the sheet P is disposed on the downstream side one by one. It is transported in a state where it hits. In the case of transporting ordinary plain paper or copy paper, the contact pressure on the upper surface of the paper by the pulling roll 61 is set to about 100 gf, and the retard pressure between the transport roll 62 and the separating roll 63 is about 400 gf during transport. Is set to
[0020]
Coated paper with high adhesiveness between sheets in such a set state (composite sheet coated with coating color, a kind of paint for the purpose of improving printability on both sides or one side of sheet P), film sheet Etc., a plurality of sheets P are transported collectively and are transported downstream by double feeding.
At this time, if the contact pressure is simply increased to spread the coated paper or film sheet, the inventor will require a very high contact pressure relative to the contact pressure for ordinary plain paper or copy paper. It became clear by the experiment by. Therefore, in the present embodiment, as one of the adhesion eliminating means for the highly adhesive sheet P such as coated paper, an air blowing device 71 is provided, and high pressure air is blown onto the sheet P, whereby the adhesion of the sheet P is achieved. The sheet P can be supplied without increasing the contact pressure of each roll. More specifically, the air outlet 73 of the air blowing device 71 shown in FIG. 4 has a lower opening at a lower side than the uppermost sheet P on which it is stacked, and an upper end at the opening is higher than the uppermost sheet P. It is configured as follows. For example, when air is blown intermittently from the air outlet 73, a lift as shown by an arrow in FIG. 5 acts on the sheet P, and the sheets P are rolled up one by one. By driving the drawing roll 61 in this state, the sheet P is fed out almost every sheet and is conveyed downstream in a stable state.
[0021]
Next, the configuration of the control panel (operation panel) 100 according to the present embodiment will be described with reference to FIGS.
As shown in FIG. 6, the control panel 100 includes a lamp 101, a display 102, and a key 103, and the lamp 101 displays the state of the image forming apparatus 21 that is, for example, a printer by turning on, blinking, or turning off. is doing. The display 102 is a liquid crystal display (LCD) and displays the content specified by the key 103. A key 103 is a mode key for specifying a mode such as ART or 201H, a menu key for specifying a paper size, a magnification setting, a font, or the like, and a pause for canceling / ejecting all jobs in the printer, for example. It has a pause key for instructing the state and has up / down / left / right keys for moving menu items.
[0022]
Now, when the menu 102 of the key 103 is operated to enter a state in which the type of the sheet supplied to the sheet supply tray 59 of the image forming apparatus 21 is entered, the display 102, as shown in FIG. It is configured to display sheet type names consisting of craft paper, film, tracing paper, and plain paper. This sheet type name is used relatively frequently as a sheet supply in the image forming apparatus 21 and is relatively influenced by the air ON / OFF when air is blown. The form is configured so that it can be displayed on behalf of other types. By pressing the up / down / left / right key of the key 103, the user selects the type of the sheet P from the sheet type names displayed on the display 102, and further presses the discharge / setting key of the key 103. The type of sheet P can be specified.
[0023]
When the user presses the key 103, the image recording control unit 33 recognizes the type of the sheet P supplied from the sheet supply tray 59. When the sheet P is recognized as glossy paper such as coated paper, film paper, or tracing paper, the image recording control unit 33 blows out the air before a predetermined time from the start of supplying the sheet P from the sheet supply unit 60. Control is performed so that the motor of the device 71 is driven. In response to the instruction from the image recording control unit 33, the air blowing device 71 rotated by the motor blows air from the air blowing port 73 toward the side surface of the sheet P. Since the upper end of the air outlet 73 is higher than the upper surface of the stacked sheets P and the lower end of the air outlet 73 is lower than the upper surface of the stacked sheets P, as shown in FIG. Rises, even glossy paper with high adhesion is drawn by the drawing roll 61 in a state of being rolled one by one, and further conveyed in a stable state downstream.
[0024]
On the other hand, when plain paper is selected on the control panel 100 of FIG. 6, the image recording control unit 33 determines that air blowing from the air blowing device 71 is not required, and prohibits the air blowing operation on the sheet P. As a result, the sheet P made of plain paper is drawn by the drawing roll 61 based on a paper feed signal from the image recording control unit 33 and is conveyed downstream without air blowing. That is, when the sheet P is plain paper, the plain paper has a relatively high inter-sheet friction coefficient, and therefore has a relatively low adhesion, and does not require air blowing and is stable without air blowing. Paper can be fed. On the other hand, when air is blown onto the plain paper, the resistance between the papers is lost, and the paper feed speed from the pull-in roll 61 is rapidly increased. In this state, when a plurality of sheets P enter the nip portion between the transport roll 62 and the separating roll 63, the sheet P passes through the sheet supply section 60 without being sufficiently wound because the sheet feeding speed is high. Therefore, it becomes a double feed and is conveyed downstream. According to the present embodiment, when plain paper having a relatively high sheet-to-sheet friction coefficient is transported, control is performed so as not to perform air blowing on the stacked sheets P, and transport failures such as multi-feeding are prevented. This can be prevented in advance, and stable sheet supply can be realized.
[0025]
7A and 7B show other display forms on the control panel 100. FIG. The paper type switch 105 in FIG. 7A can be selected as a smooth paper or a rough paper by a lever type changeover switch 106. Such a lever type changeover switch can also be used when selecting a paper type such as coated paper shown in FIG. When a slippery paper is selected by the switch 106, the sheet P having a smooth surface has a high degree of close contact between the sheets. Therefore, air blowing is necessary, and the image recording control unit 33 receives the sheet from the sheet supply unit 60. The air blowing device 71 is controlled so as to drive the motor a predetermined time before the supply of P starts. On the other hand, when the rough paper is selected by the switch 106, it is determined that air blowing is unnecessary for the sheet P having a rough surface because the degree of adhesion between the sheets is low, and the air blowing device is determined from the image recording control unit 33. A signal for driving 71 is not issued.
[0026]
Further, the paper type switch 107 in FIG. 7B can select the basis weight which is the unit weight of the sheet P by the button type switch 108. This button type switch can also be used when selecting a paper type such as coated paper shown in FIG. 6 or designating the surface state of the sheet P as shown in FIG. Based on the basis weight selected by the switch 108, the image recording control unit 33 controls the air blowing device 71. For example, if it is possible to adjust the air volume as the air blowing device 71, the air volume is weakened when a basis weight of 120 gsm or less, which is a thin paper, is specified, and the air volume when a basis weight of 200 gsm or more, which is a thick paper, is specified. For example. Further, when the air outlet 73 has a plurality of nozzles having different shapes, it is possible to control the nozzle shape to be changed between thin paper and thick paper. More specifically, since thick paper is difficult to float by air, the nozzle shape is narrowed to increase the air volume. With thin paper, two or more sheets often float together. In this state, the upper end of the nozzle is opened wide so that air blowing is continued. As described above, in this embodiment, it is possible to adjust the air volume, switch the nozzle shape, and the like in addition to the mode in which the air blowing from the air blowing device 71 is simply turned on / off.
[0027]
As described above, according to the present embodiment, paper such as coated paper is provided by a touch sensor to a liquid crystal display panel or the like provided in the control panel 100, a lever type switch, a button type switch, or the like. It is possible to input various information such as seed, sheet surface condition, sheet basis weight, etc. Based on such input, various controls such as ON / OFF of air blowing device 71, air volume, nozzle shape switching, etc. are performed. It becomes possible to do. As a result, air can be blown in an optimal state according to different types of sheets P, so that stable supply can be realized regardless of the type of sheets P.
[0028]
In the present embodiment, the configuration in which the type information of the sheet P is input from the control panel 100 provided on the outer wall portion of the apparatus main body in the image forming apparatus 21 has been mainly described. It is not limited to. For example, when the image forming apparatus 21 is used as a printer, as shown in FIG. 2, it is possible to input the types of various sheets P from an external device 25 such as a connected personal computer (PC). The input information is received by the receiving unit 29 together with the image information via the communication line 27, and the image recording control unit 33 can control the air blowing device 71 based on the input information. In this case, the external device 25 side will have designation software (printer driver or the like) equivalent to an aspect for designating the type of sheet P provided on the control panel 100 described above.
[0029]
【The invention's effect】
As described above, according to the present invention, any one of a plurality of sheet types including plain paper and glossy paper is designated , and air blowing by the air blowing means is performed on the sheet made of plain paper. While the sheet P is prohibited and conveyed by the sheet supply means one by one, the glossy paper sheet is subjected to air blowing by the air blowing means and the sheets are turned one by one. Since the sheet is conveyed and conveyed one by one by the supply means , the sheet can be supplied in a stable state regardless of the type of the sheet.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing an outline of an apparatus according to the present invention.
FIG. 2 is an explanatory diagram showing an overview of an image forming apparatus according to an embodiment.
FIG. 3 is a perspective view for explaining a sheet supply unit in the present embodiment.
FIG. 4 is a plan view of a sheet supply tray in the present embodiment.
FIG. 5 is a schematic explanatory view showing a sheet supply tray from the side according to the present embodiment.
FIG. 6 is an explanatory diagram for explaining a control panel in the present embodiment.
FIGS. 7A and 7B are explanatory diagrams for explaining other display forms of the control panel in the present embodiment. FIGS.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Sheet accommodation means, 2 ... Sheet supply means, 3 ... Air spraying means, 4 ... Sheet type designation means, 5 ... Control means, 6 ... Paper type selection switch, 21 ... Image forming apparatus, 25 ... External apparatus, 27 ... Communication line 29... Receiving unit 31. Image writing device 33. Image recording control unit 35 35 Image carrier 37. Charger 39 39 Developing device 43 Transfer roller 45 Fixing device 59 Sheet supply tray, 60 ... sheet supply unit, 61 ... drawing roll, 62 ... conveying roll, 63 ... spreading roll, 65 ... end guide, 67 ... side fixed guide, 69 ... side movable guide, 71 ... air blowing device, 73: Air outlet, 100 ... Control panel, 101 ... Lamp, 102 ... Display, 103 ... Key, 105 ... Paper type switch, 106 ... Switch, 107 ... Paper type switch, 10 ... switch, P ... sheet (paper).

Claims (6)

Sheet storage means for storing various sheets;
The sheet storage means includes a conveyance roll and a roll that are provided on the sheet conveyance direction side and are pressed against each other with a pressure set for conveying a sheet of plain paper. Sheet feeding means for feeding and feeding each sheet;
Air blowing means that blows air against the sheet accommodated in the sheet accommodating means, and places the sheets one by one on the upstream side in the sheet conveying direction from the press contact portion between the conveying roll and the rolling roll ;
A plurality of sheet types including plain paper and glossy paper are displayed so that they can be specified, and a sheet type specifying means for specifying one of the sheet types,
The sheet type designated by the sheet type designation unit is recognized, and based on the recognition result, air blowing by the air blowing unit is prohibited on the sheet made of plain paper and the sheet feeding unit While the sheets are rolled and conveyed one by one, for sheets made of glossy paper, the sheets are rolled one by one by air blowing by the air blowing means and the sheets are fed by the sheet feeding means. A sheet supply apparatus comprising: a control unit that rolls and conveys each sheet. The control means recognizes whether the sheet stored in the sheet storage means is a coated paper which is a kind of glossy paper ,
2. The sheet feeding apparatus according to claim 1, wherein the air blowing unit executes air blowing when the coated paper is recognized by the control unit. The control means recognizes whether the sheet stored in the sheet storage means is smooth paper or rough paper;
2. The sheet feeding apparatus according to claim 1, wherein the air blowing unit executes air blowing when the control unit recognizes a slippery sheet. The control means recognizes the basis weight of the sheet stored in the sheet storage means;
The sheet feeding apparatus according to claim 1, wherein the air blowing unit performs air blowing based on a basis weight recognized by the control unit.   2. The sheet feeding apparatus according to claim 1, wherein the sheet type designation means is designated by a user using a paper type selection switch.   The control means performs air blowing by an air blowing means on a sheet having a low inter-sheet friction coefficient, and does not execute air blowing by an air blowing means on a sheet having a high inter-sheet friction coefficient. The sheet supply apparatus according to claim 1.

Images