JP2008093990A - Bookbinding apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress scattering in all directions of paper dust and chips generated by milling processing. <P>SOLUTION: A milling part 200 includes a milling cutter 202 for applying milling processing on the back part of a main body 12 on which a cover 14 is pasted, and a first protective cover 208 and a second protective cover 210 arranged by opposing the milling cutter 202 so that exposure of at least a part of the milling cutter 202 is obstructed at the initial position, and movably provided so that they are retreated from the initial position to a retreating position where the milling cutter 202 is exposed when milling processing is performed. The first protective cover 208 and the second protective cover 210 are arranged so as to be divided into a plurality along the advancing direction of the main body so that they successively retract in accordance with the advancement of the main body. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a bookbinding apparatus including a milling unit for performing a milling process on a back part of a body to which a cover is to be glued.

There is known a bookbinding method called so-called perfect binding or case binding, in which a cover is glued to the back of a body on which a plurality of sheets are superimposed. In such a bookbinding apparatus, for example, as described in Patent Document 1, a milling process (also referred to as a milling process or a milling process) is performed before gluing the back of the body. The milling process is performed by meshing between a rotating milling cutter and a fixed blade as described in Patent Document 2, for example.
JP 2005-246769 A JP 2005-205655 A

  In the milling process, the back part of the main body is cut, so that paper dust and chips may be scattered. When scattered chips or the like are mixed with the glue for pasting the cover stored in the glue tank, it may adhere to the bookbinding product and impair the beauty.

  Then, an object of this invention is to provide the bookbinding apparatus which can suppress scattering, such as paper dust and chips which arise by milling process.

  In order to solve the above-described problems, a bookbinding apparatus according to an aspect of the present invention includes a milling cutter for performing a milling process on the back of a body to which a cover is to be glued, and at least a part of the exposure of the milling cutter at an initial position. A bookbinding apparatus comprising a milling unit including a protective cover that is disposed to face the milling cutter so as to hinder and is movable to be retracted from the initial position to a retracted position that exposes the milling cutter during the milling process. The protective cover is divided into a plurality of parts along the main body moving direction so as to sequentially retreat as the main body moves.

  According to this aspect, the protective cover is divided into a plurality of parts along the main body moving direction, and these protective covers are sequentially retracted as the main body advances. In other words, the protective cover arranged on the downstream side in the direction of movement of the body retracts later than the protective cover arranged on the upstream side. Therefore, even after the protective cover disposed on the upstream side is retracted at the start of the milling process, the protective cover disposed on the downstream side remains in the initial position until the body reaches the body, so that the milling cutter is not exposed. It becomes possible to do so. By reducing the exposed area of the milling cutter in this way, it becomes possible to suppress the amount of scattering of chips and the like generated with the milling process.

  The milling unit is disposed between the protective cover and the milling cutter, has a fixed blade that meshes with the milling cutter, and defines a body advancing direction, and the body in the body advancing direction between the fixed guide. And a moving guide disposed between the protective cover and the milling cutter so as to be able to approach and separate from the fixed guide so as to form a gap for entry along the body. Has a large number of rotating blades arranged on the outer periphery of a disk-shaped rotating body formed so as to be engaged with the fixed blades by rotational driving, and the protective cover is opposed to the engaging portion between the fixed blades and the rotating blades. A first protective cover whose initial position is defined so that the rotary blade has a fixed guide and a moving guide downstream of the first protective cover with respect to the direction of movement of the body. It may include a second protective cover initial position is defined so as to face the site to be exposed in the gap between.

  According to this aspect, in the milling process, two portions that are considered to generate particularly chips and the like, that is, the meshing portion of the fixed blade and the rotary blade and the rotary blade are exposed in the gap between the fixed guide and the moving guide. Each part is covered with a separate protective cover. Even after the first protective cover is retracted and cutting of the back part of the main body is started at the meshing part between the fixed blade and the rotary blade, the second protective cover is used until the main body reaches the second protective cover. It is possible to reduce the exposed area of the milling cutter by staying at the initial position. Therefore, it becomes possible to suppress the amount of scattered chips. In particular, the portion where the rotary blade is exposed in the gap between the fixed guide and the moving guide is covered with the second protective cover, thereby suppressing the scattering of chips carried downstream along with the rotation of the milling cutter. It is preferable in that it can be performed.

  Another embodiment of the present invention is also a bookbinding apparatus. This device forms a milling cutter for applying a milling process to the back of the body to which the cover is to be glued, and a linear gap corresponding to the thickness of the body directly above the milling cutter, and the back of the body is formed by the gap. A guide mechanism that guides the body in the advancing direction, and is disposed opposite the milling cutter so as to prevent exposure from at least a part of the gap of the milling cutter at the initial position, and the initial position to the retreat position where the milling cutter is exposed during the milling process. And a protective cover that is pivotally attached to the guide mechanism so as to pivot away from the position, and the protective cover is on the opposite side of the rotational center with respect to the gap. An end portion has an overhang portion that is formed to protrude toward the upstream side in the body moving direction.

  According to this aspect, even when the protective cover is rotated toward the retracted position, a part of the milling cutter is covered by the protruding portion, and the exposed area of the milling cutter can be reduced. For this reason, the amount of scattering of chips and the like generated with the milling process can be suppressed.

  It further includes a clamper portion that includes a pair of holding members that hold the body, and that drives the holding member in the body advancing direction, and the protective cover is in contact with the one farther from the center of rotation of the pair of holding members at the overhanging portion. Thus, the contact portion by the holding member of the overhanging portion is retracted from the initial position toward the upstream side of the body moving direction from the portion closer to the rotation center than the contact portion. It may be formed by overhanging.

  According to this aspect, the part that is in contact with the holding member farther from the rotation center is formed so as to protrude most upstream in the body moving direction. When the distant holding member comes into contact with the overhanging portion, the protective cover starts to rotate to the retracted position. The moving speed of the protective cover is equal to the moving speed of the main body at the contact portion, and is faster as the distance from the rotation center is larger. Therefore, since the extension part is formed so that the holding member far from the rotation center comes into contact with the extension part and starts to rotate to the retracted position, the moving speed of the protective cover is at least at the beginning of the withdrawal start. At most, it is possible to keep the body speed relatively low. Therefore, since the exposure of the milling cutter can be delayed, it is possible to suppress the amount of scattering of chips and the like generated with the milling process.

  According to the present invention, it is possible to suppress scattering of paper dust and chips generated by the milling process.

  Hereinafter, embodiments of the present invention (hereinafter referred to as embodiments) will be described with reference to the drawings.

  FIG. 1A is a front view of a bookbinding apparatus 800 according to this embodiment, and FIG. 1B is a top view of the bookbinding apparatus 800 according to this embodiment. FIGS. 1A and 1B are diagrams schematically showing main parts of the bookbinding apparatus 800, and the casing of the bookbinding apparatus 800 as a whole is not shown.

  The bookbinding apparatus 800 binds the book 10 including the body 12 and the cover 14. In the present embodiment, the body 12 means a portion of the book 10 other than the cover 14, and an image is recorded by an image recording method such as printing such as offset printing, an electrophotographic method, or an ink jet method. It means a bundle of sheets in which multiple sheets are stacked.

  The bookbinding apparatus 800 according to the present embodiment employs a bookbinding method called so-called perfect binding or case binding, pastes the back portion of the body 12 (hereinafter referred to as “back”), and attaches the cover 14. The book 10 is bound and folded. For this reason, the front cover 14 is made of a sheet of paper in which the front, back, and back portions of the book 10 are continuous. The bookbinding apparatus 800 includes a clamp unit 100, a clamper conveyance unit 700, a milling unit 200, a gluing unit 300, a nipping unit 400, a cover sheet conveyance control unit 500, and a cover sheet positioning movement unit 600.

  The clamp unit 100 includes a pair of clamp plates 110 and a clamp plate transport unit (not shown). Each of the clamp plates 110 is formed in a plate shape, and is arranged so that wide surfaces face each other. The clamp plate transport unit moves one clamp plate 110 of the pair of clamp plates in a direction away from and close to the other clamp plate 110.

  The clamp part 100 clamps the main body 12 by moving one clamp plate 110 to be close to the other. At this time, the clamp part 100 clamps the main body 12 in which one or both ends of the back part and the top part are positioned so that the back part and the side surface in the vicinity of the back part protrude from the clamp plate 110. In FIG. 1, the clamp plate 110 is shown thicker for the sake of clarity, but in reality, a flat plate-like member considerably thinner than the thickness of the main body 12 can be employed (see FIG. 3). .

  The clamper transport unit 700 transports the clamp unit 100 that sandwiches the body 12 as described above in the extending direction of the back portion of the sandwiched body 12. Hereinafter, the conveyance direction of the body 12 is appropriately referred to as a “body movement direction”. A milling unit 200, a gluing unit 300, and a nipping unit 400 are arranged in the vicinity of the conveyance path of the main body 12.

  The milling unit 200 includes a milling cutter 202, and a scratch for increasing the adhesive strength by glue is applied to the back of the body 12 by the rotational drive of the milling cutter 202. The milling cutter 202 is rotationally driven at a high speed by a rotational drive mechanism (not shown) including a motor and a power transmission mechanism. FIG. 2 is a top view of the milling cutter 202 according to the present embodiment. As shown in FIG. 2, the milling cutter 202 has a disk shape and has a number of smooth blades 212 in an annular shape on the outer periphery. In addition, roughing cutters 214 are attached to the inside of the milling cutter 202 at two locations symmetrically with respect to the center. The roughing cutter 214 rotates integrally with the milling cutter 202 and scratches and roughens the back of the body 12. Thereby, the adhesive strength of gluing can be improved. Note that paper dust and chips generated by cutting are collected by a dust collector (not shown) connected to the milling unit 200.

  The gluing part 300 applies glue to the back part damaged by the milling part 200 and the side surface in the vicinity of the back part. The gluing unit 300 includes a container 302 in which heated liquid glue is stored, and a roller 304 that is rotationally driven in the container and uniformly scrapes the glue inside. The gluing part 300 is glued to the back part of the main body 12 that has been roughened by the milling part 200 and the side surface in the vicinity thereof in the process in which the clamp part 100 passes over the roller 304.

  The nipping unit 400 affixes the cover 14 to the portion of the body 12 where the glue is applied and folds the cover 14. Specifically, the cover sheets 14 are sent one by one from the stacked state toward the nipping section 400 by the cover sheet transport control section 500. The delivered cover 14 is positioned by the cover positioning moving unit 600 and placed on a cover placement table (not shown) of the nipping unit 400. The clamper transport unit 700 transports the clamp unit 100 and stops it until the body 12 is positioned above the cover 14 placed on the cover placement table. The nipping unit 400 adheres the cover 14 to the back of the body 12 to which glue has been applied by moving the cover placement table upward to bring the cover 14 into contact with the back of the body 12. In addition, the nipping unit 400 folds the cover 14 and adheres the cover 14 to the side surface in the vicinity of the back of the main body 12 to which the paste is applied. Thus, the bookbinding apparatus 800 binds the book 10 from the body 12 and the cover 14.

  FIG. 3 is a top view of the milling unit 200 according to the present embodiment. In FIG. 3, for easy understanding, the milling cutter 202 and the guide mechanism located below the first protective cover 208 and the second protective cover 210 are indicated by broken lines, and the body 12 and the clamp plate 110 are indicated by alternate long and short dashed lines. Show. In addition, the main body moving direction is indicated by an arrow A in the direction from the upper side to the lower side in the figure, and the rotation direction of the milling cutter 202 is indicated by an arrow B in the clockwise direction in the figure.

  The milling unit 200 includes a guide mechanism including a fixed guide 204 and a moving guide 206, and the milling cutter 202 is accommodated in the lower part of the guide mechanism. The guide mechanism has a rectangular parallelepiped box shape that accommodates the milling cutter 202 as a whole, and the fixed guide 204 and the moving guide 206 are the milling cutter except for the linear gap 205 between which the main body 12 is inserted. 202 covers the entire surface. The gap 205 is formed immediately above the diameter of the milling cutter 202 and is adjusted according to the thickness of the body 12. The body 12 enters the gap 205 and is cut by the milling cutter 202.

  The fixed guide 204 is fixed at a position serving as a reference for other members in the bookbinding apparatus 800, and defines the body movement direction A. That is, the surface of the fixed guide 204 that comes into contact with the main body 12 is formed in a straight line parallel to the main body moving direction A, and the clamp portion 100 moves so that one side surface near the back of the main body 12 contacts the fixed guide 204. The body 12 is conveyed along the direction A.

  The moving guide 206 is configured to be able to approach and separate from the fixed guide 204 by a linear motion mechanism (not shown) including a motor and a rack mechanism. The moving guide 206 is moved closer to or away from the fixed guide 204 according to the thickness of the book body 12 to be bound, and a gap 205 between the fixed guide 204 and the moving guide 206 is formed according to the thickness of the main body 12. The surface of the moving guide 206 that comes into contact with the main body 12 is formed in a straight line parallel to the traveling direction A, like the fixed guide 20. Therefore, the back part of the body 12 is guided by the fixed guide 204 and the moving guide 206, and the milling process is performed.

  The milling cutter 202 rotates clockwise in the drawing, that is, in the direction indicated by the arrow B, and a fixed blade 216 is attached to the fixed guide 204 at a position where the rotating smooth blade 212 and the fixed guide 204 mesh. The back of the main body 12 is cut by meshing the smooth blade 212 and the fixed blade 216 that rotate when the main body 12 enters.

  In the milling process, there are mainly two sources of chips. The first main generation source is a meshing portion between the fixed blade 216 of the fixed guide 204 and the smooth blade 212 of the milling cutter 202. This is because the back of the body is actually cut at this meshing portion. The second main generation source is a portion where the smooth blade 212 of the milling cutter 202 is exposed to the gap 205 on the downstream side in the main body traveling direction A from the meshing portion. This is because the chips generated by the cutting at the meshing portion are carried to the downstream side by the high-speed rotation of the milling cutter 202, and the chips blow out from the exposed portion of the smooth blade 212.

  In the present embodiment, a plurality of protective covers are provided on the guide mechanism along the body movement direction A, and specifically, the first protective cover 208 and the second protective cover 210 are moved in order from the upstream side along the movement direction A. 206 is attached. The first protective cover 208 and the second protective cover 210 are respectively provided so as to face the two main chip generation sources. The initial positions of the first protective cover 208 and the second protective cover 210 are defined so that most of the milling cutter 202 is not exposed from the gap 205 between the fixed guide 204 and the moving guide 206.

  1 and 3 show a case where each of the first protective cover 208 and the second protective cover 210 is in the initial position. The first protective cover 208 and the second protective cover 210 are both plate-like members, and are disposed above the milling cutter 202 in parallel to face the milling cutter 202. The first protective cover 208 and the second protective cover 210 can protect the operator from touching the milling cutter 202 directly.

  The first protective cover 208 and the second protective cover 210 are attached to the moving guide 206 so as to be independently rotatable, and are sequentially retracted from their initial positions in accordance with the progress of the body 12 during the milling process. By retracting the first protective cover 208 and the second protective cover 210, the milling cutter 202 is exposed to the gap 205 between the fixed guide 204 and the moving guide 206, and the body 12 to be inserted can be milled. The first protective cover 208 and the second protective cover 210 are retracted in a direction intersecting the moving direction of the body 12 in the arrangement plane. Specifically, when the main body 12 is transported along the traveling direction A, the first protective cover 208 is first brought into contact with the first protective cover 208 to be retracted by rotation, and then the second protective cover 210 is moved to the second protective cover 210. The second protective cover 210 is abutted and retracted by turning. In the present embodiment, the main body 12 does not directly abut each of the first protective cover 208 and the second protective cover 210, but actually a pair of clamp plates 110 that hold the main body 12 abut. In the following, for the sake of convenience, the expression “the body 12 is in contact with the protective cover” may indicate that the holding member that holds the body 12 such as the clamp plate 110 and is integrally conveyed contacts the protective cover. Of course, the main body 12 can be brought into direct contact with the first protective cover 208 and the second protective cover 210.

  The first protective cover 208 has a shape and a retreat path so that the first protective cover 208 rotates and retracts independently of the second protective cover 210 while the second protective cover 210 is stationary at the initial position. The shapes and retracting paths of the first protective cover 208 and the second protective cover 210 are set so that the second protective cover 210 is disposed outside the moving region of the first protective cover 208. The first protective cover 208 and the second protective cover 210 are made of a resin member such as nylon, for example, so as to be slippery when the clamp plate 110 contacts.

  As shown in FIG. 3, the first protective cover 208 has a generally fan-like planar shape, and is attached to the movement guide 206 by a first pin 218 and a second pin 220. The first protective cover 208 is attached to the movement guide 206 by the first pin 218 so as to be rotatable about the first pin 218. The first pin 218 is attached in the vicinity of the upstream end of the movement guide 206 with respect to the body movement direction A.

  The first protective cover 208 is formed with an arcuate mounting groove 222 centered on the first pin 218. The attachment groove 222 is formed through the first protective cover 208, and the second pin 220 is attached by being engaged with the attachment groove 222. The attachment groove 222 is formed in a portion located downstream of the first pin 218 in the body movement direction A when the first protective cover 208 is in the initial position. The central angle of the mounting groove 222 with respect to the first pin 218 may be set in accordance with a desired rotation angle of the first protective cover 208, and is set to about 90 ° in the present embodiment, for example. Therefore, the first protective cover 208 slides on the second pin 220 along the mounting groove 222 and rotates around the first pin 218. Further, the upstream end of the first protective cover 208 and the movement guide 206 are connected by a first return spring 224, and the first return is made when the contact between the first protective cover 208 and the body 12 is released. The first protective cover 208 is naturally returned to the initial position by the elastic force of the spring 224.

  The first protective cover 208 includes an arc portion 226 having an arc-shaped side surface with the first pin 218 as the center, and an overhang portion 228 that projects toward the upstream side in the body moving direction. The overhanging portion 228 is formed so as to overhang toward the upstream side in the body movement direction A at the end opposite to the first pin 218 at the rotation center with respect to the gap 205 between the fixed guide 204 and the moving guide 206. ing. The overhanging portion 228 is formed at a portion that contacts the clamp plate 110 entering the milling portion 200 when the first protective cover 208 is in the initial position.

  As shown in FIG. 3, when a predetermined amount of gap 205 is adjusted between the fixed guide 204 and the moving guide 206 when the first protective cover 208 is in the initial position, the central portion of the overhang portion 228 is used. The fixed blade 216 of the fixed guide 204 is disposed directly below the counter. Basically, the overhanging portion 228 protrudes to the upstream side in the main body moving direction A from the straight line connecting the meshing portion of the fixed blade 216 of the fixed guide 204 and the smooth blade 212 of the milling cutter 202 and the first pin 218. Is formed.

  The contact portion of the overhanging portion 228 by the clamp plate 110 is formed to protrude toward the upstream side in the body movement direction A from the other portion of the overhanging portion 228 closer to the rotation center than the contact portion. . Since the gap 205 is formed in accordance with the thickness of the body 12, the pair of clamp plates 110 moves on the outer side of the gap 205. Therefore, the contact portion of the overhang portion 228 is located above the side end portion of the fixed guide 204 on the gap 205 side. Specifically, the first inclined portion 232 is formed continuously from the distal end portion 230 that is the end portion of the overhanging portion 228 in the body advancing direction A toward the first pin 218 that is the rotation center. . The first inclined portion 232 linearly and gently inclines from the distal end portion 230 toward the downstream side in the body movement direction A. The clamper plate 110 entering the milling unit 200 first comes into contact with the first inclined portion 232 immediately above the end of the gap 205 on the fixed guide 204 side and starts to be retracted by the rotation of the first protective cover 208. . That is, the clamp plate 110 farther from the rotation center (upward in FIG. 1B) of the pair of clamper plates 110 abuts on the first inclined portion 232 of the overhanging portion 228 to retract the first protective cover 208. Is started.

  A flat portion 234 and a second inclined portion 236 are formed from the first inclined portion 232 toward the first pin 218. The flat portion 234 is formed so as to extend in a direction perpendicular to the body movement direction A at the initial position and connect the first inclined portion 232 and the second inclined portion 236. The second inclined portion 236 is inclined in the opposite direction to the first inclined portion, and is gently inclined linearly from the flat portion 234 toward the upstream side in the body movement direction A. A first pin 218 is attached to the center of the second inclined portion 236.

  An arc portion 226 is formed on the side opposite to the first pin 218 that is the center of rotation from the distal end portion 230 of the overhang portion 228. In other words, the arc portion 226 is formed on the downstream side of the first protective cover 208. As shown in FIG. 3, in the initial position, the arc portion 226 extends on the fixed guide 204 from the distal end portion 230 toward the downstream side in the body movement direction A, and further, the gap between the fixed guide 204 and the moving guide 206. It passes over 205 and extends onto the movement guide 206.

  Both the arc portion 226 and the mounting groove 222 have an arc shape centered on the first pin 218, but the radius of the arc portion 226 is larger than the radius of the mounting groove 222, and the mounting groove 222 is connected to the first pin 218. It is formed at an intermediate portion with the arc portion 226. The radius of the arc portion 226 is determined so that the arc portion 226 does not cover the exposed portion of the downstream milling cutter 202 that is the second main chip generation source. This is because the second generation source is covered by the second protective cover 210 in the present embodiment.

  Since the shape of the first protective cover 208 is designed in this way, when the first protective cover 208 is in the initial position, the gap 205 between the fixed guide 204 and the moving guide 206 is shown in FIG. Most of the milling cutter 202 exposed to the surface is covered. In particular, the meshing portion between the fixed blade of the fixed guide 204 and the smooth blade 212 of the milling cutter 202 is covered by the first protective cover 208 so as to face directly below the overhanging portion 228.

  On the other hand, the second protective cover 210 is provided adjacent to the downstream side of the first protective cover 208 in the body movement direction A. The second protective cover 210 is rotatably attached to the movement guide 206 by a third pin 238. The second protective cover 210 is connected to the movement guide 206 by a second return spring 240, and the second return spring 240 is elastically caused by the elastic force of the second return spring 240 when the contact between the second protective cover 210 and the body 12 is released. The protective cover 210 is naturally returned to the initial position.

  The second protective cover 210 is generally a rectangular planar member, and a portion corresponding to the short side in the initial position is along the body movement direction A, and a portion corresponding to the long side is a direction perpendicular to the body movement direction A. It is arranged along. In the initial position, the second protective cover 210 is disposed so as to face the downstream end portions of the fixed guide 204 and the moving guide 206 from the downstream end portions of the milling cutter 202 in the body movement direction A. The second protective cover 210 is disposed at the initial position so as to face the smooth blade 212 of the milling cutter 202 that is exposed to the gap 205 between the fixed guide 204 and the moving guide 206 in particular. The second protective cover 210 is disposed outside the region in which the first protective cover 208 rotates, and can remain stationary while the first protective cover 208 is rotating.

  Next, operations of the first protective cover 208 and the second protective cover 210 when the body 12 is subjected to the milling process will be described with reference to FIGS. 3 to 6. 4 to 6, illustration of the first return spring 224 and the second return spring 240 is omitted for convenience.

  As shown in FIG. 3, when the clamp plate 110 that holds the body 12 enters the gap 205 between the fixed guide 204 and the moving guide 206, the first inclined portion of the overhanging portion 228 of the first protective cover 208. The clamp plate 110 that is farther from the center of rotation abuts the H.232. For this reason, the rotation speed of the first protective cover 208 can be suppressed to a comparatively low speed at most at the beginning of the retreat at the same time as the main body moving speed.

  If the clamp plate 110 that is not formed with the overhanging portion 228 and is closer to the rotation center first contacts the first protective cover 208, the rotation speed at the contact portion is about the rotation speed of the body. However, it rotates at a higher speed in the vicinity of the fixed guide 204 that is away from the rotation center. As a result, the meshing portion between the fixed blade 216 of the fixed guide 204 and the smooth blade 212 of the milling cutter 202, which is the first main chip generation source, is exposed relatively quickly. On the other hand, according to this embodiment, since the exposure of the meshing portion can be delayed, it is possible to suppress the scattering amount of chips and the like generated in association with the milling process.

  When the main body 12 further enters, as shown in FIG. 4, the first protective cover 208 is pushed by the clamp plate 110 and rotates in parallel with the milling cutter 202 around the first pin 218 toward the retracted position. Move. FIG. 4 shows a state where the first protective cover 208 is rotated about half of the rotatable amount. At this time, the body 12 is cut flush with the meshing portion between the fixed blade 216 of the fixed guide 204 and the smooth blade 212 of the milling cutter 202. Further, the back portion is roughened by a roughing cutter 214 provided in the milling cutter 202.

  If the overhanging portion 228 is not provided, the central portion of the milling cutter 202 is exposed. However, even if the body 12 enters, the central portion of the milling cutter 202 is not exposed by the overhanging portion 228. Thus, in this embodiment, since the overhang | projection part is formed in the 1st protective cover 208, the exposed area of the milling cutter 202 is reduced and scattering of chips is reduced.

  When the body 12 further enters, the first protective cover 208 is completely pushed out to the retracted position by the body 12 as shown in FIG. FIG. 5 shows a state immediately before the first protective cover 208 is rotated to the retracted position and the main body 12 comes into contact with the second protective cover 210. Since the second protective cover 210 is disposed immediately above the second main chip generation source as an initial position outside the rotation region of the first protective cover 208, the clamp plate 110 contacts the second protective cover 210. It is possible to prevent the chips from being scattered from the second main chip generation source.

  FIG. 6 shows a state in which the body 12 is conveyed from the milling unit 200 toward the pasting unit 300 which is the next process. As shown in FIG. 6, finally, both the first protective cover 208 and the second protective cover 210 rotate to the retracted position in parallel with the milling cutter 202. In this way, the milling process is completed, and the body 12 is conveyed toward the gluing unit 300.

  As described above, according to the present embodiment, the first protective cover 208 and the second protective cover 210 are divided and arranged along the body movement direction A. In addition, an overhang portion 228 is formed in the first protective cover 208. Each of these features contributes to reducing the exposed area of the milling cutter 202 by delaying the exposure of the milling cutter 202, and can suppress scattering of chips and the like from the milling section 200.

  The present invention is not limited to the above-described embodiments, and various modifications such as design changes can be added to each embodiment based on the knowledge of those skilled in the art, and such modifications are added. Embodiments can also be included within the scope of the present invention. Here are some examples.

  FIG. 7 is a top view of a milling unit 200 according to a modification of the present embodiment. As shown in FIG. 7, in this modified example, an overhang portion 242 is formed on the second protective cover 210 as well as the first protective cover 208. The projecting portion 242 is formed by projecting the outer side of the rotation region of the first protective cover 208 toward the upstream side in the body movement direction A along the arc portion 226. By forming the overhanging portion 242 in the second protective cover 210 in this way, it is possible to cover almost the entire surface of the milling cutter 202 at the initial position.

  As a further modification, in this embodiment, the protective cover is divided into two parts, a first protective cover 208 and a second protective cover 210, but it may be divided into three or more parts. It is. For example, in addition to the protective cover corresponding to the first and second main chip generation sources, a third protective cover arranged to face the roughing cutter 214 as another chip generation source may be provided. In this case, when the protective cover disposed on the upstream side is retracted, the shape of each protective cover is such that the protective cover disposed on the downstream side of the protective cover is retracted while being held at the initial position. It is preferable to set a retreat route.

  Further, in the above-described embodiment, all the protective covers are attached to the movement guide 206, but instead, it is possible to attach the protective cover to the fixed guide 204.

(A) is a front view of the bookbinding apparatus which concerns on embodiment, (b) is a top view of the bookbinding apparatus which concerns on this embodiment. It is a top view of the milling cutter which concerns on this embodiment. It is a top view of the milling part which concerns on this embodiment. It is a figure for demonstrating operation | movement of the protective cover which concerns on this embodiment. It is a figure for demonstrating operation | movement of the protective cover which concerns on this embodiment. It is a figure for demonstrating operation | movement of the protective cover which concerns on this embodiment. It is a top view of the milling part which concerns on the modification of this embodiment.

Explanation of symbols

  200 milling section, 202 milling cutter, 204 fixed guide, 205 gap, 206 moving guide, 208 first protective cover, 210 second protective cover, 212 smooth blade, 216 fixed blade, 228 overhang section, 800 bookbinding apparatus.

Claims (4)

A milling cutter for milling the back of the body to which the cover is to be glued;
It is arranged opposite to the milling cutter so as to prevent exposure of at least a part of the milling cutter at the initial position, and is provided so as to be able to move away from the initial position to the retracted position where the milling cutter is exposed during the milling process. A protective cover,
A bookbinding apparatus comprising a milling unit including
The bookbinding apparatus according to claim 1, wherein the protective cover is divided into a plurality of parts along the direction of movement of the body so as to be sequentially retracted as the body moves. The milling part is
A fixed guide that is disposed between the protective cover and the milling cutter, has a fixed blade that meshes with the milling cutter, and defines the body travel direction;
The protective cover and the milling cutter are capable of moving toward and away from the fixed guide so as to form a gap between the fixed guide and the main body along the main body moving direction so as to match the thickness of the main body. And a movement guide disposed between
The milling cutter has a large number of rotary blades arranged on the outer periphery of a disc-shaped rotary body formed so as to mesh with the fixed blades by rotational drive,
The protective cover is
A first protective cover whose initial position is defined so as to face the meshing portion of the fixed blade and the rotary blade;
A second protection whose initial position is defined such that the rotary blade faces a portion exposed in the gap between the fixed guide and the moving guide on the downstream side of the first protective cover with respect to the main body traveling direction. The bookbinding apparatus according to claim 1, further comprising a cover. A milling cutter for milling the back of the body to which the cover is to be glued;
A guide mechanism that forms a linear gap according to the thickness of the body directly above the milling cutter, and guides the back of the body in the body advancing direction through the gap,
At the initial position, the milling cutter is disposed opposite to the milling cutter so as to prevent exposure from the gap, and rotates from the initial position to the retracted position where the milling cutter is exposed during the milling process. A protective cover attached to the guide mechanism so as to be rotatable so as to be retracted;
A bookbinding apparatus comprising a milling unit including
The bookbinding apparatus, wherein the protective cover has an overhanging portion formed to protrude toward an upstream side in the body moving direction at an end opposite to the rotation center with respect to the gap. A pair of holding members for holding the body, further comprising a clamper portion for driving the holding member in the body moving direction;
The protective cover is retracted from the initial position to the retracted position by contacting the farthest from the rotation center of the pair of holding members in the overhanging portion,
The contact part by the holding member of the overhanging part is formed so as to protrude toward an upstream side in the body moving direction from a part closer to the rotation center than the contact part. Item 4. The bookbinding apparatus according to item 3.

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