JP3111720U - Saddle book cutting machine - Google Patents

Abstract

The present invention provides a means capable of preventing back cracking without placing a pillow on a lower blade when cutting the top and bottom of a saddle stitch book.
In a cutting machine that cuts a saddle-stitch book placed on a fixed lower blade with an upper blade that moves up and down, the top and bottom ends of the saddle-stitch book are moved at the time of cutting in conjunction with the upper blade that moves up and down. A back crack prevention tool that presses the upper surface of the slanted portion of the saddle stitch book is attached to the clamp, and the space between the lower surface of the slanted portion of the saddle stitch book and the fixed lower blade is pushed by this back crack preventing device. A saddle-stitch cutting machine that crushes and cuts. Moreover, this back crack prevention tool is made into a band plate shape, and an inclined surface is formed at the corner of one short side, and the inclined portion of the back of the saddle stitch book is pressed by this inclined surface.
[Selection] Figure 1

Description

  The present invention relates to a saddle stitch book cutting machine, and more particularly to a cutter capable of preventing a back crack that is likely to occur when a thick saddle book is cut.

  A saddle-stitch book is formed by stacking sheets that are at least twice the size of the book and folding them in half, stopping the back with a wire, and cutting the top and bottom and the forehead with a cutting machine. In order to fold it in half, the thickness of the back portion of the saddle-stitch book becomes thinner toward the tip side, and inclined portions that are slightly rounded are formed on both the front and back sides. The width of the inclined portion is usually about the same as the thickness of the saddle stitch book. Conventionally, when cutting a thick saddle-stitched book, it has been a problem that a back crack occurs in an inclined portion near the back tip. This back crack is a small tear or fray that occurs at the top and bottom of the cover at a position of a few millimeters from the tip of the back, and occurs in the lower part when cutting.

  FIG. 4 is an explanatory diagram of a mechanism for generating a back crack during cutting. As shown in FIG. 4A, the saddle stitch book 2 is placed on the lower blade 1, the upper surface thereof is pressed by the clamp 3, and the upper blade 4 is lowered to cut the top and bottom of the saddle stitch book 2. At that time, a shearing force in the direction of arrow A acts on the back inclined portion 6 of the saddle stitch book 2 due to friction with the upper blade 4. Since there is a space between the lower side of the back inclined portion 6 and the lower blade 1, the tip of the back is pushed down, and the inclined portion 6 is deformed as shown in FIG. Since the upper surface of the saddle stitch book 2 is fixed by the clamp 3, a strong tensile force acts on the inclined portion 6. The lower part of the back receives a force perpendicular to the overlap of the sheets one by one, and the paper turns over and warps in the space part, which causes a back crack.

  As a method for preventing such back cracking, it is conceivable to eliminate a space between the inclined portion of the back and the lower blade (or pedestal). For this reason, various methods have been proposed in which a member that becomes a pillow is placed between the back of the saddle stitch book and the lower blade to eliminate the space. For example, in Patent Document 1 below, as shown in FIG. 5, a pillow-shaped cutting blade 10 having an inclined surface with an acute angle on the lower blade 1 is slid and replaced so as to overlap the lower blade cutting blade surface. A saddle-stitch cutting machine provided freely is disclosed.

No. 4-48951

  When a fixed pillow is used in the method using a pillow as described above, the pillow is placed in the transport direction of the book after cutting, so it is necessary to move the book over the pillow. There are pillow damages such as scratches on the surface. In addition, it is possible to make the pillow detachable so that the pillow can be released after cutting, but the position and height of the pillow changes depending on the size and thickness of the book. There seems to be no case where such a method has been put into practical use. In any case, it must be avoided that the work efficiency of cutting is reduced due to the attachment / detachment of the pillow.

  Therefore, when cutting the top and bottom of the saddle-stitch book using the fixed lower blade and the upper blade that moves up and down, the present invention eliminates the need to place a pillow on the lower blade, and between the inclined portion of the back and the lower blade. It is possible to eliminate the space of the booklet, thereby providing a means that can prevent the saddle stitch book from cracking without scratching the surface of the book or reducing the cutting workability. It is an issue.

  In order to solve the above problems, a saddle stitch cutting machine of the present invention is a cutting machine having a fixed lower blade and an upper blade that moves up and down, and in conjunction with the upper blade that moves up and down during cutting, the cutting machine A back crack preventing device that presses the upper surface of the slanted portion of the saddle stitch book is attached to a clamp that holds the top and bottom ends of the saddle book placed on the fixed lower blade of To do.

  In this cutting machine, it is preferable that the space between the lower inclined surface of the back of the saddle stitch book and the fixed lower blade is crushed by the back crack prevention tool at the time of cutting.

  Further, the back crack prevention device is in the form of a band plate, and an inclined surface is formed at the corner of one short side thereof, and the inclined surface of the saddle stitch book is pressed by the inclined surface. Is preferred.

  Moreover, it is preferable that the width | variety of this back crack prevention tool is the same as the width | variety of a clamp, and the angle between the clamp lower surface of an inclined surface is 45 to 80 degree | times.

  Furthermore, it is preferable that at least a portion of the back crack preventing tool that contacts the saddle stitch book is formed of an elastic material.

  Further, in the cutting machine of the present invention described above, a protrusion made of an elastic material that protrudes downward at substantially the same height as the back crack prevention device is formed at a predetermined position on the front side of the saddle stitch book under the clamp. The clamp is preferably configured to prevent the clamp from tilting when the clamp is lowered to the upper surface of the lower blade in the absence of the pressing object.

  Furthermore, if a jig that can be attached and detached is attached to the clamp, and the back crack prevention tool is attached to the pressing surface of the jig, the back crack can be prevented at an appropriate location according to the size of the saddle stitch book. Tools can be installed easily.

  The saddle-stitch book cutting machine according to the present invention is a back crack prevention tool attached to the lower surface of the clamp, and is characterized by pressing the inclined part of the back of the book against the upper surface of the lower blade. By making a very simple improvement to this, the problem of back cracking can be drastically solved.

  According to the configuration of the present invention, since the back crack prevention device moves up and down together with the clamp, the pillow does not scratch the book or interfere with the book transport as in the conventional method using a pillow. . As described above, the present invention is a simple and inexpensive mechanism that can prevent back cracking at the time of cutting without affecting the work efficiency of bookbinding, and has great practical significance.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings of the examples. 1A and 1B are diagrams schematically showing a configuration of a saddle stitch book cutting machine according to an embodiment of the present invention. FIG. 1A is a side view and FIG. 1B is a front view. This cutting machine presses a saddle stitch book 2 placed on a lower blade (pedestal) 1 with a clamp 3 and lowers the upper blade 4 to cut the top and bottom of the book. The back crack prevention tool 5 is attached to the lower surface of 3. This back crack prevention tool 5 consists of two pieces, and is disposed at the top and bottom ends of the saddle stitch book, respectively.

  FIG. 2 is a diagram showing the shape of the back crack prevention tool used in this example. This back crack prevention tool 5 is in the shape of a rectangular strip, and its short side is parallel to the back of the book, and is attached so as to press the inclined portion 6 of the back of the saddle stitch book 2. An inclined surface 7 is formed at the lower corner of one short piece of the back crack prevention tool 5. The inclined surface 7 is for holding the inclined portion 6 of the back of the book with the surface, fixing the book more stably, and preventing escape of the book at the time of holding.

  As shown in FIG. 2 (b), when the clamp 3 is lowered, the back crack prevention device 5 is attached at such a position that the inclined surface 7 hits the back inclined portion 6 of the book and presses it downward. It has been. Thus, by pressing the inclined portion 6 with the inclined surface 7, it becomes easier to deform the inclined portion 6, and the gap between the lower surface of the inclined portion 6 and the upper surface of the lower blade 1 is surely eliminated. Can do. In addition, as for the attachment position of the back crack prevention tool 5, it is better to be as close to the end of the book as possible as long as it does not protrude outside the book.

  The back crack prevention tool 5 is preferably made of an elastic material, particularly a rubber plate, in order to prevent the book from being scratched. The entire back crack prevention device 5 may be rubber, or only the portion in contact with the book may be rubber. If the whole is made of rubber, the soft rubber will deform and the presser effect will be insufficient. A hard material having a considerably large deformation resistance is preferable.

  The width w of the back crack prevention device 5 is preferably the same as the width of the clamp. This is because a thick saddle-stitched book requires a considerable amount of force to deform the back inclined portion 6, and the pressing effect can be surely obtained by pressing only near the top and bottom ends. The thickness t of the back crack prevention tool 5 may be 0.5 to 1.0 times the thickness of the book.

  The length l of the back crack prevention device 5 is not particularly limited, but the length l is sufficient to secure a sufficient bonding area because the back crack prevention device is bonded to the lower surface of the clamp with a double-sided tape having sufficient adhesive strength. Is preferably larger than the width w. In addition, the inclination angle (angle between the inclined surface 7 and the lower surface of the clamp) θ of the inclined surface 7 is 45 to 80 degrees. The reason why this range is preferable is that if the angle is not equal to or larger than the contact portion with the inclined portion 6, the downward crushing is insufficient and the book is fixed and the escape is prevented.

  According to the configuration of the present invention described above, the lower surface of the clamp 3 presses the upper surface of the saddle stitch book 2, and at the same time, the back crack prevention device 5 presses the back inclined portion 6 so that at least in the vicinity of both ends of the book. As shown in FIG. 2 (b), it is possible to create a state where there is no gap between the back inclined portion 6 and the upper surface of the lower blade 1. If the upper blade 4 is lowered in this state and the top and bottom of the book is cut, the paper is bent back by the action of the tensile force on the lower side of the back inclined portion 6 and there is no turning and the back cracking at the time of cutting is completely prevented. can do.

  Next, if the clamp 3 is raised, the back crack prevention tool 5 rises together with this, so there is no obstacle for carrying the book on the lower blade 1. The effect of the present invention is that the back cracking can be prevented without causing the problem of obstructing the conveyance of the book as in the conventional method using a pillow.

  FIG. 3 is a schematic side view showing the configuration of a saddle stitch cutting machine according to another embodiment of the present invention. In this example, the configuration in which the back crack preventing device 5 is attached to the lower surface of the clamp 3, the shape of the back crack preventing device 5, and the like are the same as in the example of FIG. However, this example is different in that a protrusion 9 is formed on the lower surface of the clamp 3 at a predetermined position on the front fore edge 8 side of the saddle stitch book 2. The protrusions 9 are in the form of rubber prisms, and are attached to the lower surface of the clamp 3 so as to protrude downward at substantially the same height as the back crack prevention device 5.

  The purpose of providing this protrusion 9 is to prevent the tilt of the clamp during idling. That is, when there is no book to be pressed and the clamp is lowered to near the upper surface of the lower blade, the back crack prevention tool 5 hits, the lower surface of the clamp 3 is tilted, and the torsional force is applied to the clamp which is a mechanism only for vertical movement. In addition, there is a risk of damage due to repetitive movements of excessive loads.

  Therefore, a protrusion 9 having substantially the same height as this is provided on the opposite side of the back crack prevention tool 5, and this is used as a stopper to always keep the horizontal state and prevent the tilt of the clamp during idling. The position where the protrusions 9 are provided is not particularly limited as long as it does not hit the book to be cut. Moreover, although the number of the protrusions 9 is not particularly limited, it is usually preferable to provide one or more on the top of the book.

  As described above, the cutting machine of the present invention is an extremely simple and inexpensive means that can prevent the saddle stitch book from cracking without adversely affecting the workability of cutting. Is very significant.

  FIG. 6 is a diagram schematically showing the configuration of the back crack prevention tool mounting jig 20 that can be attached to and detached from the clamp 3. The back crack prevention tool mounting jig 20 is attached to the clamp 3, and the back crack prevention tool 5 is attached to the pressing surface of the jig, so that the back crack prevention tool 5 is attached according to the size of the saddle stitch book. It can be installed easily.

It is a figure which shows typically the structure of the saddle stitch book cutting machine which is one Example of this invention. It is a figure which shows the shape of the back crack prevention tool in a present Example. It is a side surface schematic diagram which shows the structure of the cutting machine of the saddle stitch book which is the other Example of this invention. It is explanatory drawing of the generation | occurrence | production mechanism of the back crack at the time of cutting. It is a figure which shows an example of the conventional back crack prevention method. It is a figure which shows typically the structure of a back crack prevention tool attachment jig.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lower blade 2 Saddle book 3 Clamp 4 Upper blade 5 Back crack prevention tool 6 Back inclination part 7 Inclined surface 8 Front edge 9 Protrusion 10 Pillow-shaped cutting blade 20 Back crack prevention tool attachment jig

Claims (7)

  In a cutting machine having a fixed lower blade and an upper blade that moves up and down, the top and bottom ends of the saddle stitch book placed on the fixed lower blade of the cutting machine in conjunction with the upper blade that moves up and down during cutting A saddle-stitch book cutting machine characterized in that a back crack prevention tool that presses the upper surface of the inclined portion of the back of the saddle-stitch book is attached to the clamp that holds the saddle.   2. The saddle stitch book cutting machine according to claim 1, wherein the space between the lower inclined surface of the back of the saddle stitch book and the fixed lower blade is crushed by the back crack prevention tool during cutting.   The back crack prevention device is in the form of a band plate, and an inclined surface is formed at a corner of one short side thereof, and the inclined portion of the back of the saddle stitch book is pressed by the inclined surface. The saddle-stitch book cutter described in 2.   4. The saddle stitch book cutting according to any one of claims 1 to 3, wherein a width of the back crack prevention device is the same as a width of the clamp, and an angle between the inclined surface and the lower surface of the clamp is 45 to 80 degrees. Machine.   The saddle stitch book cutting machine according to any one of claims 1 to 4, wherein at least a portion of the back crack prevention tool that is in contact with the saddle stitch book is formed of an elastic material.   A protrusion made of an elastic material that protrudes downward at the same height as the back crack prevention device is formed at a predetermined position on the front side of the saddle-stitch booklet on the lower surface of the clamp, and the clamp is lowered with no pressing object. The saddle-stitch book cutter according to any one of claims 1 to 5, wherein the cutter is configured to prevent tilting of the clamp when lowered to the blade upper surface. 6. A detachable and slidable back crack prevention tool mounting jig is attached to the clamp, and the back crack prevention tool is attached to a pressing surface of the jig. A saddle-stitch cutting machine.

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