Sheet type discrimination device and sheet type discrimination device control program

Abstract

A sheet type discrimination device includes a holder that holds a sheet, a conveyor that conveys a sheet from the holder along a conveyance path, a measurer that measures a basis weight of the sheet conveyed along the conveyance path, a storage that stores a type discrimination table describing a relationship between the basis weight and a type of a sheet, and a hardware processor that sets the type of the sheet held in the holder on the basis of the basis weight measured by the measurer.

What is claimed is: 
     
         1 . A sheet type discrimination device comprising:
 a holder that holds a sheet;   a conveyor that conveys a sheet from the holder along a conveyance path;   a measurer that measures a basis weight of the sheet conveyed along the conveyance path;   a storage that stores a type discrimination table describing a relationship between the basis weight and a type of a sheet; and   a hardware processor that sets the type of the sheet field in the holder on the basis of the basis weight measured by the measurer,   wherein the type discrimination table prescribes a unique range being a range of basis weight in which the sheet type is uniquely discriminated, and a selection range being a range of basis weight in which the sheet type is discriminated into either of a first type in which the basis weight is relatively large and a second type in which the basis weight is relatively small,   the sheet type discrimination device further comprising a selection screen display that displays a selection screen being a screen that receives operation of selecting the sheet type from the first and second types in a case where the basis weight measured by the measurer is within the selection range, and that receives selection through the selection screen, and   in a case where the selection screen is displayed, the hardware processor sets the type of the sheet held in the holder to the type received through the selection screen.   
     
     
         2 . The sheet type discrimination device according to  claim 1 ,
 wherein the unique range includes: a first unique range being a range of basis weight in which the sheet type is uniquely discriminated to be the first type; and a second unique range being a range of basis weight in which the sheet type is uniquely discriminated to be the second type, having a conveyance speed of the first sheet type a conveyance speed of the second sheet type different from each other, and   the selection range is set between the first unique range and the second unique range.   
     
     
         3 . The sheet type discrimination device according to  claim 1 , further comprising:
 a setting screen display that display s a setting screen that receives operation to set the type of sheet held in the holder and receives setting of the sleet type through the setting screen after setting of the sheet type held in the holder by the hardware processor,   wherein the hardware processor changes the setting of the type of the sheet held in the holder to the type for which setting has been received by the setting screen display, and   the setting screen display displays the setting screen that receives operation of setting a sheet type out of the first type and the second type.   
     
     
         4 . The sheet type discrimination device according to  claim 3 ,
 wherein, in a case where the basis weight measured by the measurer is a value within the unique range, the setting screen display does not receive operation of setting the sheet type through the setting screen.   
     
     
         5 . The sheet type discrimination device according to  claim 1 ,
 wherein the hardware processor discriminates whether there is a need to display the selection screen, and   in a case where the basis weight measured by the measurer is a value within the selection range and when the hardware processor determines that there is no need to display the selection screen, the selection screen display does not display the selection screen.   
     
     
         6 . The sheet type discrimination device according to  claim 5 , further comprising
 a change detector that detects a change in the type of the sheet field in the holder,   wherein, in a case where the change detector has not detected a change in the type of the sheet field in the holder in a state where the type of the sheet held in the holder is set, the hardware processor determines that there is no need to display the selection screen.   
     
     
         7 . The sheet type discrimination device according to  claim 6 ,
 wherein, in a case where the change detector has not detected a change in the type of sheet held in the holder in a state where the type of the sheet held in the holder is set, the hardware processor does not change the setting of the type of the sheet held in the holder.   
     
     
         8 . The sheet type dissemination device according to  claim 5 , further comprising
 an image former that forms an image in accordance with a received job,   wherein, in a case where the type of the job is a specific type, the hardware processor determines that there is no need to display the selection screen.   
     
     
         9 . The sheet type discrimination device according to  claim 8 , wherein the specific type includes a print job for management of an image forming apparatus. 
     
     
         10 . The sheet type discrimination device according to  claim 8 ,
 wherein the storage further stores a conveyance speed discrimination table describing a relationship between the type of the sheet and a conveyance speed, and   in a case where the hardware processor has determined that there is no need to display the selection screen, the hardware processor specifies the conveyance speed of each of the first and second types of sheets on the basis of the conveyance speed discrimination table, and sets the type of the sheet field in the holder to the type having the higher conveyance speed among the first and second types.   
     
     
         11 . The sheet type discrimination device according to  claim 5 , further comprising
 an image former that forms an image in accordance with the received job,   wherein the storage further stores: a conveyance speed discrimination table describing a relationship between the type of sheet and the conveyance speed; and another type discrimination table describing a relationship between the basis weight and the type of sheet and uniquely prescribing the type of the sheet with respect to the basis weight,   the hardware processor determines that there is no need to display the selection screen in a case where the mode of the job is a specific mode, in a case where it is determined by the hardware processor that there is no need to display the selection screen and where the mode of the job is the first mode, the hardware processor sets the type of the sheet held in the holder using the conveyance speed discrimination table on the basis of the basis weight measured by the measurer, and   in a ease where it is determined by the hardware processor that there is no need to display the selection screen and where the mode of the job is a second mode different from the first mode, the hardware processor sets the type of sheet held in the holder using the other type discrimination table on the basis of the basis weight measured by the measurer.   
     
     
         12 . The sheet type discrimination device according to  claim 5 , further comprising:
 an image former that forms an image in accordance with a job received from a user, and   a position acquisitor that acquires information regarding the position of the user,   wherein the hardware processor determines that there is no need to display the selection screen in a case where the position of the user is away from the position of the image forming apparatus more than a predetermined distance.   
     
     
         13 . The sheet type discrimination device according to  claim 5 , further comprising
 an image former that forms an image in accordance with a received job,   wherein in a case where predetermined post-processing is set for the job, the hardware processor determines that there is no need to display the selection screen, and the hardware processor sets the type of the sheet held in the holder to the first type.   
     
     
         14 . The sheet type discrimination device according to  claim 5 , further comprising:
 another selection screen display that performs, in a predetermined case after the type of the sheet is set by the hardware processor, displaying another selection screen being a screen that receives operation of selecting the type of the sheet from among the first and second types and receiving selection through the other selection screen,   wherein the hardware processor changes, in a case where the other selection screen is displayed, the sheet type set by the hardware processor to the type for which selection has been received by the other selection screen display.   
     
     
         15 . The sheet type discrimination device according to  claim 14 ,
 wherein the hardware processor evaluates quality of an image formed by the image former after setting of the type of the sheet by the hardware processor, and   in a case where it is determined by the hardware processor that there is no need to display the selection screen, and where the quality evaluated by the hardware processor is lower than a predetermined value, the other selection screen display displays the other display screen, and receives selection through the other selection screen.   
     
     
         16 . The sheet type discrimination device according to  claim 14 ,
 wherein, in a case where it is determined, by the hardware processor, that there is no need to display the selection screen, and where the number of occurrences of jams exceeds a predetermined number, the other selection screen display displays the other display screen, and receives selection through the other selection screen.   
     
     
         17 . The sheet type discrimination device according to  claim 1 ,
 wherein the hardware processor changes, in a case where an evaluation value of the quality of the image formed by the image former after the type of the sheet is set by the hardware processor is lower than a predetermined value, where the basis weight measured by the measurer is within the selection range, and where the type of the sheet set by the hardware processor and the type of the sheet discriminated by another type discrimination table describing a relationship between the basis weight and the sheet type and uniquely prescribing the type of sheet with respect to the basis weight are different from each other, the type of sheet set by the hardware processor to the type discriminated by using the other type dissemination table.   
     
     
         18 . The sheet type discrimination device according to  claim 1 ,
 wherein the hardware processor changes, in a case where the basis weight measured by the measurer is a value within the selection range, and the number of occurrences of jams after setting of the type of the sheet by the hardware processor exceeds a predetermined number, the type of sheet set by the hardware processor to the type having a slower conveyance speed among the first and the second type.   
     
     
         19 . A non-transitory recording medium storing a computer readable program for controlling a sheet type discrimination device including: a holder that holds a sheet; a conveyor that conveys a sheet from the holder along a conveyance path; a measurer that measures a basis weight of the sheet conveyed along the conveyance path; and a storage that stores a type discrimination table describing a relationship between the basis weight and a type of the sheet,
 the program provided for causing a computer to execute setting of the type of the sheet held in the holder on the basis of the basis weight measured by the measurer,   the type discrimination table prescribing a unique range being a range of basis weight in which the sheet type is uniquely discriminated, and selection range being a range of basis weight in which the sheet type is discriminated into either of a first type in which the basis w eight is relatively large and a second type in which the basis weight is relatively small,   the program being provided for causing the computer to execute displaying a selection screen being a screen that receives operation of selecting the sheet type out of the first and second types in a case where the basis weight measured by the measurer is within the selection range, and receiving selection through the selection screen,   wherein, in a case where the selection screen is displayed, the type of the sheet held in the holder is set to the type for which selection has been received through the selection screen.