Analysis of the Cutting Quality of Three-side Cutting Machines

Cutting books is the last process in plain paper processing. To make the three-side cutters have the same finished dimensions, not only must the three-sided cutters adjust the dimensions as required, but in the binding process arrangement, the former process should be formed to serve the latter process. purpose.

After the mechanical folding, firstly, the books are bundled and flattened to create favorable conditions for the basic consistency of the back thickness of the binding book, so that the binding mechanism of the binding machine works reliably, and the back thickness of the book after binding is consistent, and the squareness is straightforward. Secondly, when the glue-binding process is on the upper side, it should be thin and uniform, and it should be firmly bonded. To prevent the side glue from being too thick, the back of the book is higher than the incision and when the book is cut on three sides, a big fault is caused. When the gum is glued, it should be as thick as possible according to the quality standards, and eliminate wrinkles on the back of the book when the three sides are cut. And in the case of firm bonding, the back of the book should not be thicker than the incision, which can make the back of the book slightly rounded, and create the conditions for the three book cutters to be the same size as the book. When cutting books on three sides, it is not only necessary to adjust the knife rules according to customer requirements, but also maintain the book size. And to find out the waste book of this procedure, find out whether the folding is inaccurate, not cut, how many pages of the post, there is no side glue or the back of the book is not firmly bonded. What is important is to use the method of searching for slips to find out books such as white pages, severely dirty versions, holes in papers, inverted posts, and so on. Finally, personal responsibility labels are used to fulfill work responsibilities and ensure the quality of the entire book.

Only in the case that the first few processes created favorable conditions for the three-sided cuts, three-sided cuts can guarantee quality. The three-side cutters adjust the machinery according to regulations, excluding the cutting sizes that are common in the operation of the three-sided cutters, such as improper books, skewed left and right sides, and unclean incisions.

Question 1: Up and down knife

The reason is that the pressure of the jack pressure plate is improperly adjusted, the pressure is too large, the back of the book stack will curl up, the pressure is too small, and the book stack will bulge under the presser foot. After cutting, the size of the front mouth of the book pile surface is larger than the normal size below. The height of the platen should be adjusted to 5~10mm from the book stack; the paper is loose and there is much air in the upper layer. When the book is pressed down, the paper moves, causing the size above to be smaller than the normal size below; Should be flattened after collation; the tailgate of the book-carrying book carrier is not perpendicular to the workbench and should be adjusted vertically; the cutting height is high, resulting in high pressure on the paper press, large pull force, and paper bending Large deformation, appropriate to reduce the height of the cut book; cut book mechanism, the track or bearing wear of the book holder, so that when the book feeder to send books back and forth, so that the book size is different, should replace the wear parts, re-adjust the bearing eccentricity, Make the gap consistent.

Question 2: The size of the doorknives is not the same

The reason for this is that some components in the book delivery mechanism are not well-matched; the needle bearings on the connecting rod are worn out, and the relevant bearings should be replaced periodically; the roller cams controlling the stroke of the delivery mechanism have gaps, and the angle of double rolling balls should be readjusted. , Eliminating gaps; The nut on the swinging body is loose, the clamping block is processed to make it lockable, and the inspection worker is required to use the production book and the sample book for comparison to prevent the dimensional change; the pendulum sleeve of the fixed shaft is worn so that The journey is not the same and should be replaced; the doorknife skid has a gap and should be readjusted.

Question 3: Sword flowers

The reason is that the incision has uneven marks, the blade is worn, there is a chipping phenomenon, and the knife should be changed or sharpened in time.

Question 4: Breaking

The reason for this is that there is no cross-cutting knife device, or the rules of the road-sinking knife are not suitable and should be used correctly. Should improve the previous process requirements to reduce the phenomenon of breakage. Ensure that the glue layer is between 0.8 and 1.2mm, the plastic tray is level and there is no vacuole in the package; the cover paper must not be too bad, the vertical direction of the fiber direction of the cover paper is parallel to the word of the back; the binding of the signature of the paper is important, and the milling and backing Slots should be clean and smooth, or easy to make the back glue loose, thickening the back; side glue can not be too thick, glue book can not be slanted back; appropriate cut height, reduce the broken head. The blade is not sharp and the knife angle is too small. The blade with a 19-degree angle should be used with a sharp edge, and the glue attached to the cutting edge of the blade should be often scraped off and marked with paraffin or soap.

Question 5: Skew after the book is cut

The reason is that the tailgate of the delivery trolley is not parallel to the doorknife, and the parallelism should be adjusted; the eccentric roller in the track of the delivery trolley is not well adjusted, the gap is too large, and the left and right sides are skewed. It is necessary to adjust to the trolley without swing; the upper shell wears and Deformation should be replaced.

Question 6: Maokou

The reason is that the blade is used too long or cut too deeply, or the quality of the blade is not high. The blade cut into the knife should be 0.5 ~ 1.0mm, frequently changing the blade and keeping the blade sharp.

Question 7: The first day of each stack of books, the ground is close to the back of the incision

The reason for this is that the pressure plate is not marked with a bevel or pressure; the side glue is too thick, the book is too thin, and the cutting height is high. Coping solution.

Question 8: Days and feet are cut partially

The reason is that the undercut of the doorknife and the side blade is not true or uneven; the clearance between the sideknife auxiliary slideway and the slider or the eccentric positioning axis moves, causing the sideknife to lift up when cutting under the incision, sometimes cutting constantly; before and after the upper side knife The dimensions are inconsistent and cannot be cut off. The blade position should be adjusted downward again.

Question 9: Book Rejection

The reason is that the uppermost book has a large and small arc; the pressure of the jacking plate is insufficient, and the pressure should be increased; the gap between the lower matboard and the gate knife blade on the pressure plate is greater than 0.5 mm, and the mat should be re-added with the cardboard. Cut out together, the same size, eliminate the spacing.


Source: Xinhua Printing Network