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Learn More About Rollfed Scanners
How does a rollfed scanner work?
A rollfed scanner, also known as a sheet-fed scanner, is a type of digital imaging equipment designed to handle large documents that are fed into the scanner one at a time.
Here’s how a typical rollfed scanner works:
- The rollfed scanner has a feeder mechanism that accepts individual documents. The document feeder usually consists of a set of rollers or belts that grip the document and move it through the scanning process.
- As the document is fed into the scanner, it passes through an alignment mechanism to ensure proper positioning. This mechanism may include guides or sensors to detect the size and orientation of the document.
- Once the document is properly aligned, it moves past an optical scanning element. The optical scanning element typically consists of a light source and a sensor; the light source illuminates the document, and the sensor captures the reflected light to create a digital image of the document.
- The captured image is then processed by the scanner’s internal electronics. Image processing may involve adjustments to enhance image quality, correct colors, and optimize the scanned data.
- The processed digital image is then converted into a digital file format, such as JPEG, PDF, or TIFF. The resulting digital file can be stored on a computer or sent to other devices or applications.
- After scanning is complete, the document is typically ejected from the scanner. Some rollfed scanners may have mechanisms to stack, return, or organize scanned documents.
Will a rollfed scanner work for my materials?
Rollfed scanners are commonly used in industries where there is a need for high-speed document scanning, such as real estate, architecture, construction, manufacturing, textiles, art, archival, and service bureaus. They are efficient for processing large volumes of documents quickly and are suitable for handling various paper sizes and types.
The limitations of rollfed scanners include thickness, texture, and condition of the documents being scanned. Because originals are fed through the scanner, only a certain thickness can be accommodated (specific to each scanner model). Textured, rough, or dirty documents can scratch the scanner glass or harm the internal mechanisms of the scanner (unless carrier sheets are used). Some originals are so fragile that a rollfed scanner should not be used, as the rollers can tear or damage the materials.
In these cases, a flatbed scanner would be best for these types of documents.
How can I protect my old, fragile, torn documents and books during the scanning process?
Carrier sheets are a great way to protect your documents when using a large format rollfed scanner. White-backed sheets are best for most applications and to reduce light reflection. Black-backed sheets are for specialized applications, including template scanning and tracing patterns for the apparel and upholstery markets, as well as semi-transparent originals printed on both sides (such as newspapers and double-sided maps) – to prevent backside image appearing in the frontside scan.
Benefits of carrier sheets:
- Protect fragile, dry, aging and valuable materials.
- Protect scanner glass from documents contaminated with storage debris and dust.
- Scan documents in badly torn condition or with missing edges.
- Scan lightweight or oddly shaped originals, including upholstery patterns.
- Scan transparencies more effectively and minimize light reflection.
Depending on the condition of the documents being scanned, each carrier sheet can last for hundreds to thousands of scans before it should be replaced. To extend the life of your carrier sheets, you can apply a product called Rain-X – with a new formula designed to be used with plastic. Normally this is done to protect glass from wear and tear, but it also works great for scratched carrier sheets.
Please visit our Carrier Sheet page to place an order.
What is the difference between CCD (Charged Coupled Device) technology and CIS (Contact Image Sensor) technology used in large format scanners, and which is best for my application?
CCD Imaging (Charged Coupled Device):
This method of scanning involves capturing images through the use of a series of cameras that are spread out across the scanning area. These scanning systems use a fluorescent light source and a series of mirrors to reflect light from the surface of the document and pass it to the camera array. The number of cameras will vary depending on brand, model, and scanner width. These systems are also very sensitive, and require calibration from time to time as atmospheric and environmental factors can throw the camera alignment off. The main calibration that needs to be performed is a stitching calibration which aligns the areas where camera fields intersect. Color and white point calibrations generally required for these scanners as well.
CIS Imaging (Contact Image Sensor):
This method of scanning involves capturing images through the use of light reflected off of the surface of the document on to a silicone light sensing array. The silicone sensors are divided into individual sensing cells, and the size and density of these cells determines the optical DPI of the Scanner. The illumination for these Scanners is produced by Light Emitting Diodes (LED) pulses that are directed along surface of the document, and then on to the sensor. Color CIS sensing is produced by rapidly pulsing red, green and blue LEDs. Because there is no color filter used, the color gamut (range of the color spectrum that the scanner can capture) is generally somewhat less than that of a CCD scanner.
Which Technology is right for me?
This question is somewhat dependent upon the application that the scanner is being used for. A good way to make this determination is whether you need to capture color at a high resolution and with a wide and highly accurate color gamut. If you really need high end graphics resolution, then a CCD scanner is what you should be looking at. If you primarily scan line drawings, blueprints, or any other document that does not require high end graphics resolution, then you may want to consider a CIS scanner. CIS scanners require less calibration, will maintain calibration longer, and are very effective and accurate machines for most scanning applications.