Sharp UX-4000M Service Manual - Page 44

UX-4000MU FO-2950MU/C CHAPTER 3. MECHANICAL DESCRIPTION [1] Mechanical description 1. Facsimile block 1-1. Document feed block and diagram Rear plate 1st transfer pinch roller ORG sensor Separation rubber plate Front sensor Document 2nd transfer pinch roller 2) Document separation system: Friction + speed reduction ratio + roller backlash separation system Last document Separate rubber plate First document Feed roller Feed roller CIS 1st transfer roller 2nd transfer roller Fig. 1 2. Document feed operation 1) As shown in Fig.1, the document set in the hopper (the front sensor is on) is fed with the let out roller and paper feed roller which rotate together with the pulse motor. 2) When a specified number of pulses are received from the document sensor after the document lead edge is sensed, scanning will be started. 3) When a specified number of pulses are received from the document sensor after the document rear edge is sensed, scanning will be ended to discharge the document to the tray. 4) If the front sensor is on (the document is set up in the hopper), the next document is supplied and fed nearly when the last document is completely read and discharged. If the front sensor is off (no document is set up in the hopper), the drive will be stopped when the document is discharged to the tray. 3. Hopper mechanism 3-1. General view Fig. 2 The hopper is used to align documents with the document guides adjusted to the paper width. NOTE: Adjust the document guides before and after inserting the docu- ment. 3-2. Automatic document feed 1) The structure with secure paper feed of the transfer roller and secure separation of the separation rubber plate system is employed. The transfer roller is semicircular as to be rotated only when the paper feed roller is driven with the 2-step paper feed clutch mechanism. Moreover, the separation securely done by running the paper feed and transfer rollers more slowly than the feed roller. Fig. 3 3-3. Loading the documents 1) Make sure that the documents are of suitable size and thickness, and free from creases, folds, curls, wet glue, wet ink, clips, staples and pins. 2) Place documents face down in the hopper. • Adjust the document guides to the document width. • Align the top edge of documents and gently place them into the hopper. The first page under the stack will be taken up by the feed roller to get ready for transmission. NOTE: 1) Curled edge of documents, if any, must be straighten out. 2) Do not load the documents of different sizes and/or thicknesses together. 3-4. Documents applicable for automatic feed Indication Weight Metric system indication indication Thickness Metric system indication indication Document Document size size Range Number of Document size ADF sheets Weight Paper quality Kind Product specifications Lower Limit Upper Limit 52g/m2 80g/m2 0.06mm 0.1mm Minimum (148mm × 128mm) A4 (210mm × 297mm) Letter (216mm × 279mm) Legal (216mm × 356mm) Minimum ~ Letter/A4 size 20sheets Legal 1 sheet More than 90 kg Below 135kg 1 sheet Paper of fine quality/bond paper/ Kent paper NOTE: Double-side coated documents and documents on facsimile recording paper should be inserted manually. Documents corresponding to a paper weight heavier than 90kg and lighter than 135kg are acceptable for manual feed. Documents heavier than 135kg in terms of the paper weight must be duplicated on a copier to make it operative in the facsimile. 3 - 1 manuals4you.com