Milling apparatus

Abstract

The milling apparatus (10) is arranged in such a manner that the deep groove cutter (21) is attached to the milling cutter (20) and the rotational drive shaft (23a) is approximately orthogonal to a spine (16a) of a sheet bundle (16) by the mechanism for tilting the drive apparatus (24) when an EVA-based hot melt adhesive is used. The milling apparatus (10) is arranged in such a manner that the shallow cutter (22) is attached to the milling cutter (20) and the rotational drive shaft (23a) is tilted with respect to a conveying direction of the sheet bundle (16) by the mechanism for tilting the drive apparatus (24) when a PUR-based holt melt adhesive is used.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view showing a milling cutter, a shallow groove cutter and a combination thereof in accordance with the present invention;

FIG. 2 is a perspective view showing a deep groove cutter and a combination of the deep groove cutter and the milling cutter in accordance with the present invention;

FIG. 3 is a cross sectional view of a main part showing a milling apparatus in accordance with the present invention;

FIG. 4 is a plan view schematically showing a conventional adhesive book binding system;

FIG. 5 is a perspective view schematically showing a conventional adhesive book binding system;

FIG. 6 is a side elevational view showing deep grooves and shallow grooves formed in a sheet bundle by the deep groove cutter or the shallow groove cutter; and

FIG. 7 is a cross sectional view of a main part showing a conventional milling apparatus.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

A preferred embodiment of the present invention will be explained in detail with reference to the accompanying drawings.

A milling apparatus 10 in accordance with the present invention is provided with a drive apparatus 23 having a rotational drive shaft 23a extending upwardly, a disc-shaped milling cutter 20 concentrically connected to a top end of the rotational drive shaft 23a and arranged in a plane perpendicular to the rotational drive shaft 23a, a shallow groove cutter 22 or a deep groove cutter 21 attached to an upper surface of the milling cutter 20, and a mechanism for tilting the drive apparatus 24, as shown in FIGS. 3A and 3B.

The milling cutter 20 has an annular and tabular blade base 20a, and a large number of trimming blades 20b upwardly protruding from an outer periphery of the blade base 20a, as shown in FIG. 1A. The milling cutter 20 has a mounting hole 20c for attaching the shallow groove cutter 22 and a hole 20d for attaching the deep groove cutter 21, in an inner side of the trimming blades 20b. The milling cutter 20 can selectively attach the shallow groove cutter 22 or the deep groove cutter 21.

The shallow groove cutter 22 has an annular and tabular blade base 22a, and first groove cutting blades 22b upwardly protruding from an outer periphery of the blade base 22a, as shown in FIG. 1B. An outer diameter of the blade base 22a is smaller than an outer diameter of the milling cutter 20. An inner diameter of the blade base 22a is approximately equal to an inner diameter of the milling cutter 20. The first groove cutting blades 22b are formed in such a manner that they protrude upwardly over the trimming blades 20b of the milling cutter 20, when the shallow groove cutter 22 is attached to the milling cutter 20. The shallow groove cutter 22 has a hole 22c for being attached to the milling cutter 20.

The shallow groove cutter 22 is mounted on an upper surface of the milling cutter 20 as shown in FIG. 1C, and can be detachably attached by inserting a fixing tool such as a bolt through the hole 22c of the shallow groove cutter 22 and the mounting hole 20c of the milling cutter 20.

The deep groove cutter 21 is constituted by a columnar main body 21a, and a second groove cutting blade 21b provided at a top end of the main body 21a. The deep groove cutter 21 is detachably mounted to a hole 20d provided in the blade base 20a of the milling cutter 20, for example, by a screwing, as shown in FIG. 2B. The second groove cutting blade 21b is formed in such a manner that it protrudes upwardly over the first groove cutting blades 22b of the shallow groove cutter 22, when the deep groove cutter 21 is attached to the milling cutter 20.

The drive apparatus 23 has a rotational drive shaft 23a upwardly protruding, a support disc 23b coaxially attached to a top end of the rotational drive shaft 23a, and a shaft hole 23c provided in an upstream side in the conveying direction and through which a horizontal shaft 24b to be described below is inserted, as shown in FIGS. 3A and 3B. The milling cutter 20 is detachably mounted on an upper surface of the support disc 23b, by a fixing tool such as a bolt.

The mechanism for tilting the drive apparatus 24 has a fixed frame 24a and a cam 24c arranged between the frame 24a and the drive apparatus 23, as shown in FIGS. 3A and 3B. The horizontal shaft 24b is extending across the conveying direction and carried by the frame 24a. The horizontal shaft 24b is arranged at an upstream side in the conveying direction in such a manner that the drive apparatus 23 can be tilted around the horizontal shaft 24b. The cam 24c has a frame 24g provided in a downstream side of the drive apparatus 23, a cam body 24e received in the frame 24g and supporting the frame 24g, a rotating shaft 24f of the cam body 24e, and an operation lever 24d attached to an end portion of the rotating shaft 24f. The rotating shaft 24f is supported to the frame 24a approximately horizontally.

Next, an operation of the milling apparatus 10 in accordance with the present invention will be explained.

When the EVA-based hot melt adhesive is used, as shown in FIG. 3A, the milling cutter 20 and two deep groove cutters 21 are combined to be attached onto the support disc 23b of the drive apparatus 23.

Further, as shown in FIG. 3A, the rotating shaft 24f is rotated via the operation lever 24d, and the cam body 24e is set to an upward eccentric state. As a result, the drive apparatus 23 is arranged in such a manner that the rotational drive shaft 23a is approximately orthogonal to the spine 16a of the sheet bundle 16.

In this state, when the milling cutter 20 is rotated by the drive apparatus 23, the spine 16a of the sheet bungle 16 passing through the upper side is trimmed by the trimming blades 20b of the milling cutter 20.

Further, the deep groove 16b is formed on the spine 16a of the trimmed sheet bundle 16 by the second groove cutting blades 21b of the deep groove cutter 21 rotating together with the milling cutter 20. At this time, a rotating speed of the milling cutter 20 and a conveying speed of the sheet bundle 16 are adjusted in such a manner that the second groove cutting blades 21b intersect with the spine 16a of the sheet bundle 16 so as to be spaced. As a result, the deep grooves 16b are formed at a relatively coarse pitch on the spine 16a of the sheet bundle 16 passing through the upper side of the milling apparatus 10, as shown in FIG. 3A.

When the PUR-based hot melt adhesive is used, as shown in FIG. 3B, the milling cutter 20 and the shallow groove cutter 22 are combined to be attached onto the support disc 23b of the drive apparatus 23.

Further, as shown in FIG. 3B, the rotating shaft 24f is rotated via the operation lever 24d, and the cam body 24e comes to a state of being eccentric to a lower side. As a result, the drive apparatus 23 descends at a position supported to the cam body 24e, and is rotated around the horizontal shaft 24b. Further, the drive apparatus 23 is arranged at a position at which the rotational drive shaft 23a is tilted at an angle with respect to the conveying direction of the sheet bundle 16.

In this state, when the milling cutter 20 is rotated by the drive apparatus 23, the spine 16a of the sheet bundle 16 passing through the upper side is trimmed by the trimming blades 20b of the milling cutter 20.

Further, the shallow grooves 16c are formed by the first groove cutting blades 22b of the shallow groove cutter 22 rotating together with the milling cutter 20, on the spine 16a of the trimmed sheet bundle 16. At this time, the rotating speed of the milling cutter 20 and the conveying speed of the sheet bundle 16 are adjusted in such a manner that the first groove cutting blades 22b intersects with the spine 16a of the sheet bundle 16 without being spaced. As a result, the shallow grooves 16b are formed at a relatively fine pitch, as shown in FIG. 3B, on the spine 16a of the sheet bundle 16 passing through the upper side of the milling apparatus 10.

In this case, since the rotational drive shaft 23a is tilted with respect to the conveying direction of the sheet bundle 16, it is possible to prevent the shallow grooves 16c temporarily formed in the upstream side from being cut again by the first groove cutting blades 22b in a downstream side and lost.

As mentioned above, the milling apparatus in accordance with the present invention is structured such that the rotational drive shaft of the drive apparatus can be tilted with respect to the conveying direction depending on the adhesive to be used by the mechanism for tilting the drive apparatus having the simple structure. Therefore, in milling apparatus on the basis of the present invention, it is possible to selectively use the EVA-based hot melt adhesive and the PUR-based hot melt adhesive, and it is possible to construct the adhesive book binding system compact.

The description is specifically given above of the embodiments in accordance with the present invention, however, the present invention is not limited thereto. The number of the deep groove cutter 21 is not limited to two, and it may be one, or may be three or more.

The first groove cutting blades 22b and the second groove cutting blades 21b may be arranged in an outer side in a radial direction of the trimming blades 20b of the milling cutter 20.

The mechanism for tilting the drive apparatus 24 is not limited to the structure using the cam mechanism, but may be structured such that the drive apparatus is moved up and down, for example, by a hydraulic mechanism or the like so as to be tilted.

The tilt of the drive apparatus 23 at the time of using the PUR-based hot melt adhesive may be a tilt to an upstream side or a tilt to a downstream side.

Claims

1. A milling apparatus (10) incorporated in an adhesive book binding system (1) which executes a series of adhesive book binding processes while conveying a sheet bundle (16), and arranged underneath the conveying path of said sheet bundle (16) for cutting a spine (16a) of said sheet bundle (16), said milling apparatus (10) having; a drive apparatus (23) having a rotational drive shaft (23a) extending upwardly; anda disc-shaped milling cutter (20) concentrically connected to a top end of said rotational drive shaft (23a) and arranged in a plane perpendicular to said rotational drive shaft (23a), said milling cutter (20) being provided with a large number of trimming blades (20b) arranged along one circumference and protruding upwardly for trimming said spine (16a) of said sheet bundle (16), said milling apparatus characterized in thatsaid milling cutter (20) has at least one first groove cutting blade (22b) or at least one second groove cutting blade (21b) selectively attached to an inner side or an outer side in a radial direction with respect to a row of said trimming blades (20b);said first groove cutting blade (22b) upwardly extending over said trimming blades (20b) and forming shallow grooves (16c) on said spine (16a) of said sheet bundle (16);said second groove cutting blade (21b) upwardly extending over said first groove cutting blade (22b), and forming deep grooves (16b) on said spine (16a) of said sheet bundle (16); and thatsaid milling apparatus (10) further comprises a mechanism for tilting said drive apparatus (24) in such a manner that said drive apparatus (23) is arranged at a first position when said milling cutter (20) has said second groove cutting blade (21b), and that said drive apparatus (23) is arranged at a second position when said milling cutter (20) has said first groove cutting blade (22b),said rotational drive shaft (23a) being positioned approximately orthogonal to said spine (16a) of said sheet bundle (16) at said first position,said rotational drive shaft (23a) being tilted at a predetermined angle to said spine (16a) of said sheet bundle (16) at said second position.

2. The milling apparatus (10) according to claim 1, characterized in that said mechanism for tilting said drive apparatus (24) comprises: a frame (24a);a horizontal shaft (24b) extending across the conveying direction and carried by said frame (24a) and arranged at an upstream side or a downstream side in the conveying direction in such a manner that said drive apparatus (23) can be tilted around said shaft (24b); anda cam (24c) arranged between said drive apparatus (23) and said frame (24a) for moving said drive apparatus (23) upwardly and downwardly so as to tilt said drive apparatus (23) around said shaft (24b).

3. The milling apparatus (10) according to claim 1, characterized in that a shallow groove (16c) for adhesive bonding by a PUR-based hot melt adhesive is formed by said first groove cutting blade (22b) on said spine (16a) of said sheet bundle (16), and a deep groove (16b) for adhesive bonding by an EVA-based hot melt adhesive is formed by said second groove cutting blade (21b) on said spine (16a) of said sheet bundle (16).