three-side trimming machine

Abstract

Provided is a three-edge cutting machine that switches between a mode in which cut processed books are gathered in a constant number and moved out, and a mode in which cut processed books are sequentially gathered. The three-edge cutting machine is provided with a cutting unit (1), a book gathering unit (3), a moving-out unit (2), and a conveying mechanism (4) that conveys cut processed books (BK) to the book gathering unit. When the book gathering unit is operated in a handover mode, each time a book is placed on a shelf, the shelf is lowered by an amount corresponding to the thickness of the book, and when the books on the shelf reach a prescribed amount, the shelf is moved to the height of an inlet (2a) of the moving-out unit so as to drive a roller conveyor to feed the books to the moving-out unit, after which the shelf is moved to the height of an outlet (1a) of the cutting unit. When the book gathering unit is operated in a gathering mode, during a period in which a prescribed amount of books is gathered on the shelf, each time a book is placed on the shelf, the shelf is lowered by an amount corresponding to the thickness of the book.

Description

[0001] The present application is a divisional application of the patent application No. 201910712566.X, the parent application was filed on August 2, 2019, and the name of the invention of the parent application is "Three-edge cutting machine". TECHNICAL FIELD

[0002] The present application relates to a three-edge cutting machine. BACKGROUND

[0003] In the conventional three-edge cutting machine, after the book is cut and processed into the book top, the book root and the cutout in units of one book or multiple books, it is handed over to the carrying-out device (belt conveyor, etc.) provided at the outlet of the three-edge cutting machine, and the carrying-out device is used to carry out sequentially (for example, refer to Patent Document 1).

[0004] Alternatively, in the conventional three-edge cutting machine, after the book is cut and processed into the book top, the book root and the cutout in units of one book or multiple books, it is sequentially stacked in the stacker provided at the outlet of the three-edge cutting machine, and when the stacker is full, the books are manually carried out in the form of a stack (for example, refer to Patent Document 2).

[0005] On the other hand, in the manufacturing site of the book, in order to efficiently process various orders, it is more optimal to sequentially carry out the cut and processed books from the three-edge cutting machine, and it is more optimal to carry out the cut and processed books in a single stack.

[0006] However, in the prior art, there is no three-edge cutting machine that can simply switch between the two different carrying-out methods for implementation.

[0007] In addition, the books carried out from the three-edge cutting machine by the carrying-out device, or manually carried out from the three-edge cutting machine in the form of a stack are bundled as final products.

[0008] However, the bundling of the books is done by aggregating the required number of books, so the number of books bundled can generally vary.

[0009] Therefore, according to the conventional three-edge cutting machine as described above, it is necessary to aggregate the books carried out by the carrying-out device by the number of bundles, or it is necessary to distribute the stack of books by the number of books to be bundled.

[0010] However, this work of aggregating or distributing the books by the number of bundles is done manually, which becomes a factor that reduces work efficiency.

[0011] PRIOR ART DOCUMENT

[0012] PATENT DOCUMENT

[0013] Patent Literature 1: Japanese Patent Application Publication No. 2013-230539

[0014] Patent Literature 2: Japanese Patent Application Publication No. 2013-18084 SUMMARY

[0015] PROBLEMS TO BE SOLVED BY THE INVENTION

[0016] Therefore, an object of the present application is to provide a three-edge trimmer capable of operating in a mode in which cut booklets are gathered by a desired number of booklets and are discharged, and a mode in which cut booklets are gathered into one and are discharged.

[0017] MEANS FOR SOLVING THE PROBLEMS

[0018] To solve the above problems, according to the present application, there is provided a three-edge trimmer characterized by comprising: a trimming unit that trims a book top, a book root, and a cutout of a book; and a carrying-out unit that is disposed on a downstream side of the trimming unit, carries out the book after the trimming, and has an inlet at a position that is at the same level as an outlet of the trimming unit or lower than the outlet, the three-edge trimmer further comprising: a book gathering unit that is disposed between the trimming unit and the carrying-out unit, is capable of switching between a handover mode and a gathering mode to operate, in the handover mode, hands over the book after the trimming to the carrying-out unit every time a predetermined amount is gathered, and in the gathering mode, gathers the book after the trimming without handing it over to the carrying-out unit; and a carrying mechanism that carries the book after the trimming from the trimming unit to the book gathering unit every time the trimming by the trimming unit ends, the book gathering unit having: a shelf capable of ascending and descending, on which the book after the trimming is placed; an ascending and descending mechanism that causes the shelf to ascend and descend; and a belt conveyor or a driven roller conveyor that is disposed on an upper surface of the shelf, is capable of feeding the book placed on the shelf to the inlet of the carrying-out unit, when the book gathering unit operates in the handover mode, the shelf of the book gathering unit descends from a position at the same level as the outlet of the trimming unit by an amount corresponding to the thickness of the book every time the book is placed on the shelf, and when a predetermined amount of books are gathered on the shelf, the shelf ascends or descends to the same level as the inlet of the carrying-out unit to stop, the belt conveyor or the driven roller conveyor feeds the predetermined amount of books to the carrying-out unit, and thereafter, the shelf is located at the same level as the outlet of the trimming unit in order to receive the next book, on the other hand, when the book gathering unit operates in the gathering mode, the shelf of the book gathering unit descends from a position at the same level as the outlet of the trimming unit by an amount corresponding to the thickness of the book every time the book is placed on the shelf during a period until the maximum number of books that can be accommodated by the book gathering unit or a predetermined amount of books are gathered on the shelf.

[0019] According to a preferred embodiment of the present application, the carrying mechanism has a chuck head capable of holding the book after the cutting process, a guide extending from the cutting unit to above the shelf of the book gathering unit, the chuck head being slidably mounted to the guide, and a chuck head driving mechanism reciprocating the chuck head along the guide, at the end of the cutting process by the cutting unit, the chuck head holding the book after the cutting process moves from the cutting unit toward the book gathering unit, upon reaching the shelf, the book is released and placed on the shelf, and then, in order to hold the next book, the chuck head moves toward the cutting process unit, thereby carrying the book from the cutting unit to the book gathering unit.

[0020] According to a further preferred embodiment of the present application, a photoelectric sensor is arranged at the outlet of the cutting unit to detect the book placed on the shelf of the book gathering unit, the photoelectric sensor is set to be in an on state when the book on the shelf horizontally blocks the height position of the photoelectric sensor, and in an off state when the book on the shelf does not horizontally block the height position of the photoelectric sensor, the shelf starts to descend at the time point when the chuck head releases the book, and stops the descent at the time point when the photoelectric sensor is in the off state, thereby, each time the book is placed on the shelf, the shelf descends by an amount corresponding to the thickness of the book.

[0021] According to a further preferred embodiment of the present application, a proximity sensor is arranged at one of the carrying-out unit and the shelf of the book gathering unit, and a detected plate paired with the proximity sensor is arranged at the other of the carrying-out unit and the shelf of the book gathering unit, or a proximity sensor is arranged at one of the cutting unit and the shelf of the book gathering unit, and a detected plate paired with the proximity sensor is arranged at the other of the cutting unit and the shelf of the book gathering unit, when the shelf reaches the height position of the entrance of the carrying-out unit, the proximity sensor detects the detected plate, when the book gathering unit operates in the handover mode, the shelf on which the prescribed amount of books is placed is raised or descended, each time the proximity sensor detects the detected plate, the movement of the shelf stops and the belt conveyor or the drive roller conveyor of the shelf supplies the prescribed amount of books to the carrying-out unit.

[0022] According to another preferred embodiment of the invention, during the period until the predetermined number of books are gathered on the shelf, each time a constant number of books are gathered on the shelf, the belt conveyor or the drive roller conveyor of the shelf alternately repeats forward and backward movements at a constant distance, thereby placing the books on the shelf in an alternately staggered manner.

[0023] According to another preferred embodiment of the invention, the height of the inlet of the transfer unit can be changed.

[0024] According to another preferred embodiment of the invention, the conveying unit is composed of a belt conveyor, a driven roller conveyor, or a free roller conveyor.

[0025] Invention Effects

[0026] According to the present invention, a booklet gathering unit is configured between the cutting unit and the transfer unit, and the booklet gathering unit can switch between a mode in which the booklets after cutting are collected and handed over to the centralized transfer unit according to the required number of booklets, and a mode in which the booklets after cutting are gathered without being handed over to the transfer unit. Therefore, it is possible to use a single three-sided cutting machine to handle either the preferred situation of sequentially transferring the booklets after cutting from the three-sided cutting machine, or the preferred situation of centrally transferring the booklets after cutting in a single stack, thereby enabling efficient processing of various orders.

[0027] Furthermore, by using a three-sided cutting machine to remove the cut booklets in a pre-summed bundled state, the efficiency of the booklet bundling operation can be greatly improved. Attached Figure Description

[0028] Figure 1 This is a perspective view showing the overall structure of a three-sided cutting machine according to an embodiment of the present invention.

[0029] Figure 2 (A) to (C) are explanations Figure 1 The main view of the operation of the booklet gathering unit of the three-sided cutting machine in the handover mode.

[0030] Figure 3 (A) to (C) are explanations Figure 1 The main view of the action in the aggregation mode of the booklet aggregation unit of the three-sided cutting machine.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1 Cutting unit

[0033] 1a Export

[0034] 2. Relocation Unit

[0035] 2a entrance

[0036] 3 folio gathering unit

[0037] 4 carrying mechanism

[0038] 5 shelf

[0039] 6 lifting mechanism

[0040] 7 driven roller conveyor

[0041] 8 chuck head

[0042] 9 photoelectric sensor

[0043] 10 proximity sensor

[0044] 11 detected board

[0045] 12 another proximity sensor

[0046] BK folio DETAILED DESCRIPTION

[0047] Hereinafter, the structure of the present application will be described with reference to the accompanying drawings and based on a preferred embodiment.

[0048] Figure 1 is a perspective view showing the overall structure of a three-edge trimmer according to an embodiment of the present application.

[0049] Referring to Figure 1 , the three-edge trimmer of the present application is provided with a trimming unit 1 that trims the top, root, and cutout of a processed folio, and a carrying-out unit 2 that is disposed on the downstream side of the trimming unit 1 and carries out the folio BK that has been trimmed.

[0050] The trimming unit 1 can trim the folio BK in units of one or more folios. The number of folios to be trimmed at one time is determined based on information input through a control panel (not shown) of the three-edge trimmer.

[0051] Note that in this embodiment, the trimming unit 1 trims the folio BK in units of one folio.

[0052] The carrying-out unit 2 is composed of a belt conveyor, a driven roller conveyor, or a free roller conveyor, and the entrance 2a of the carrying-out unit 2 is located at a lower position than the exit 1a of the trimming unit 1.

[0053] Note that the entrance 2a of the carrying-out unit 2 can also be located at the same height as the exit 1a of the trimming unit 1.

[0054] The three-sided cutting machine of the present invention further includes: a booklet gathering unit 3, which is disposed between the cutting unit 1 and the transfer unit 2, and can switch between a handover mode and a gathering mode to operate. In the handover mode, the booklets BK after cutting are gathered and handed over to the transfer unit 2 in a predetermined quantity. In the gathering mode, the booklets BK after cutting are gathered without being handed over to the transfer unit 2. And a transport mechanism 4, which transports the booklets BK after cutting from the cutting unit 1 to the booklet gathering unit 2 at the end of each cutting process performed by the cutting unit 1.

[0055] The booklet gathering unit 3 includes: a height-adjustable shelf 5 on which the cut booklets BK are placed; a lifting mechanism 6 that raises and lowers the shelf 5; and a drive roller conveyor 7 disposed on the upper surface of the shelf 5 that can supply the booklets BK placed on the shelf 5 to the inlet 2a of the transfer unit 2.

[0056] It should be noted that a belt conveyor can be used instead of the drive roller conveyor 7.

[0057] In addition, as the lifting mechanism 6, a well-known and suitable structure that can lift the shelf 5 can be used.

[0058] In this embodiment, the conveying mechanism 4 includes: a chuck head 8 capable of holding the cut booklet BK; a guide (not shown) extending from the cutting unit 1 to above the shelf 5 of the booklet gathering unit 3, the chuck head 8 being slidably mounted on the guide; and a chuck head drive mechanism (not shown) that causes the chuck head 8 to reciprocate along the guide.

[0059] Furthermore, at the end of each cutting process performed by the cutting unit 1, the chuck head 8 holds the cut booklet BK from the cutting unit 1 and moves toward the booklet gathering unit 3. When it reaches the shelf 5, it releases the booklet BK and places it on the shelf 5. Then, it moves toward the cutting unit 1 in order to hold the next booklet BK.

[0060] Therefore, booklet BK is transported from cutting unit 1 to booklet gathering unit 3.

[0061] Figure 2 This is an explanation Figure 1 The main view of the operation of the booklet gathering unit of the three-sided cutting machine in the handover mode. Figure 3 This is an explanation Figure 1 The main view of the action in the aggregation mode of the booklet aggregation unit of the three-sided cutting machine.

[0062] Reference Figure 2 as well as Figure 3A photoelectric sensor 9 is provided at the outlet 1a of the cutting unit 1. The photoelectric sensor 9 detects booklets BK placed on the shelf 5 of the booklet gathering unit 3.

[0063] The photoelectric sensor 9 is set to be in an on state when the booklet BK on the shelf 5 horizontally blocks the height position of the photoelectric sensor 9, and to be in an off state when the booklet BK on the shelf 5 does not horizontally block the height position of the photoelectric sensor 9.

[0064] When the shelf 5 of the booklet gathering unit 3 is not carrying any booklets BK, it is at the same height as the outlet 1a of the cutting unit 1. However, it begins to descend at the moment when the chuck head 8 releases the booklet BK, and stops descending at the moment when the photoelectric sensor 9 becomes disconnected. Thus, each time a booklet BK is placed on the shelf 5, the shelf 5 descends by an amount corresponding to the thickness of the booklet BK (see reference). Figure 2 (A) and (B)).

[0065] In addition, a proximity sensor 10 is provided on one of the shelves 5 of the cutting unit 1 and the booklet gathering unit 3 (in this embodiment, the cutting unit 1), and a detection plate 11 paired with the proximity sensor 10 is provided on the other of the cutting unit 1 and the shelf 5 (in this embodiment, the shelf 5).

[0066] When shelf 5 reaches the height position of inlet 2a of transfer unit 2, proximity sensor 10 detects the detected plate 11 (refer to...). Figure 2 (C)).

[0067] In addition, another proximity sensor 12 is configured in the proximity sensor 10 of the cutting unit 1.

[0068] When the maximum number of booklets that the booklet gathering unit 3 can hold are gathered on shelf 5, the proximity sensor 12 detects the detected plate 11 (see reference). Figure 3 (C)).

[0069] It should be noted that in this embodiment, proximity sensors 10, 12 and the plate to be detected 11 are arranged in the cutting unit 1 and the shelf 5, but proximity sensors 10, 12 and the plate to be detected 11 can also be arranged in the transfer unit 2 and the shelf 5.

[0070] Thus, as Figure 2 As shown in (A) and (B), when the booklet gathering unit 3 operates in the handover mode, each time a booklet BK is placed on the shelf 5, the shelf 5 of the booklet gathering unit 3 descends from a position at the same height as the outlet 1a of the cutting unit 1 by an amount corresponding to the thickness of the booklet BK. When a predetermined amount of booklets BK is gathered on the shelf 5, the shelf 5 of the booklet gathering unit 3 rises or falls toward the inlet 2a of the transfer unit 2.

[0071] And, as Figure 2 As shown in (C), when the proximity sensor 10 detects the detected plate 11, the movement (rising or falling) of the shelf 5 stops. At this time, the shelf 5 is located at the same height as the entrance 2a of the transfer unit 2.

[0072] Next, the drive roller conveyor 7 supplies the booklets BK gathered on the shelf 5 to the transfer unit 2. After that, the shelf 5 returns to the same height as the outlet 1a of the cutting unit 1 in order to receive the next booklet BK. The group of booklets BK handed over to the transfer unit 2 is then moved out by the transfer unit 2.

[0073] In this case, the number of booklets that should be gathered on shelf 5 in the handover mode is pre-input through the control panel (not shown) of the three-sided cutting machine. On the other hand, the number of booklets is counted each time the photoelectric sensor 9 changes from on to off (shelf 5 descends). When the count value becomes equal to the input value, it is determined that the number of booklets BK on shelf 5 has reached the specified amount.

[0074] Furthermore, when the booklets BK on shelf 5 reach a predetermined quantity, in order to facilitate the handover to transfer unit 2, shelf 5 is pre-set to either rise or fall as follows.

[0075] That is, based on the height of the outlet 1a of the cutting unit 1, the thickness of each booklet BK1 input through the control panel, and the number of booklets to be gathered, the height of the shelf 5 when the booklets BK on the shelf 5 reach the specified amount is calculated. When the obtained value is higher than the height of the inlet 2a of the transfer unit 2, the shelf 5 is set to descend; when the obtained value is lower than the height of the inlet 2a of the transfer unit 2, the shelf 5 is set to rise.

[0076] Additionally, when the booklet aggregation unit 3 operates in aggregation mode, such as Figure 3 As shown in (A) and (B), each time booklet BK is placed on shelf 5, shelf 5 of booklet gathering unit 3 is lowered from a position at the same height as the outlet 1a of cutting unit 1 by an amount corresponding to the thickness of the booklet, and as shown in (A) and (B). Figure 3 As shown in (C), the three-sided cutting machine stops when the detected plate 11 is detected by the proximity sensor 12. Then, the assembly of booklets BK on the shelf 5 is manually removed to the outside.

[0077] It should be noted that in this embodiment, in the gathering mode, booklets BK are gathered until the booklet gathering unit 3 is full. However, the number of booklets to be gathered in the booklet gathering unit 3 can also be preset through the control panel. Before the booklet gathering unit 3 is full, the three-sided cutting machine will stop when a set number of booklets BK have been gathered in the booklet gathering unit 3 (on the shelf 5).

[0078] According to the present application, either of the cases that it is more preferable to sequentially carry out the cut processed book from the three-edge trimmer and the case that it is more preferable to collectively carry out the cut processed book as a single stack from the three-edge trimmer can be dealt with by one three-edge trimmer, and thus various orders can be efficiently processed.

[0079] Further, the cut processed book is carried out from the three-edge trimmer in a state of being previously aggregated in the number of bundles, and thus the efficiency of the bundling work of the book can be greatly improved.

[0080] The above describes the preferred embodiments of the present application, but the structure of the present application is not limited to the above-described embodiments, and of course a person skilled in the art can conceive various modifications within the range of the structure described in the technical solution.

[0081] For example, in the above-described embodiments, when the book aggregation unit is operated in either of the handover mode and the aggregation mode, during the period until the shelf is placed with the prescribed number of books, the shelf is lowered by the amount corresponding to the thickness of the book each time the cut processed book is placed on the shelf of the book aggregation unit, but it can also be that the shelf is not lowered by the amount corresponding to the thickness of the book each time the book is placed on the shelf, but the drive roller conveyor of the shelf alternately repeatedly performs the advancing movement and the retreating movement by a constant distance each time a constant number of books are aggregated on the shelf. Thereby, the books are placed on the shelf in an alternately staggered state, and the distribution work of the books can be made efficient.

[0082] Further, in the above-described embodiments, the entrance of the carrying-out unit is fixed to the height set in advance, but the height of the entrance of the carrying-out unit can also be changed.

[0083] In the above-described embodiments, the chuck head is used as the carrying mechanism that carries the cut processed book from the cutting unit to the book aggregation unit, but the structure of the carrying mechanism is not limited to the above-described embodiments, and a pusher or the like can also be used as the carrying mechanism.

[0084] Further, in the above-described embodiments, the sensor (photoelectric sensor, proximity sensor) is used to control the lifting of the shelf of the book aggregation unit, but the lifting of the shelf can also be controlled using the rotary encoder or the potentiometer provided to the lifting mechanism.

[0085] Furthermore, in the above-described embodiments, the carrying-out unit is connected to the book aggregation unit in a manner that the book carrying-out direction of the carrying-out unit is in line with the book carrying direction of the carrying mechanism, but the carrying-out unit can also be connected to the book aggregation unit in a manner that the book carrying-out direction of the carrying-out unit is at right angles to the book carrying direction of the carrying mechanism.

[0086] In this case, the drive roller conveyer (or belt conveyer) on the shelf of the book gathering unit is also arranged at right angles to the book carrying direction of the carrying mechanism as the carrying-out unit.

Claims

1. A three-edge trimmer comprising: a trimming unit that performs trimming processes on a book top, a book root, and a cutout of a book; a carrying-out unit that is provided on a downstream side of the trimming unit and carries out the book processed by the trimming unit; a book gathering unit that is provided between the trimming unit and the carrying-out unit, is capable of switching between a handover mode in which the processed book is handed over to the carrying-out unit every time a prescribed amount is gathered and a gathering mode in which the processed book is gathered without being handed over to the carrying-out unit, and operates in the handover mode or the gathering mode; and a carrying mechanism that carries the processed book from the trimming unit to the book gathering unit every time a process performed by the trimming unit ends, wherein the book gathering unit has: a shelf on which the book processed by the trimming unit is placed; a belt conveyor or a drive roller conveyor that is provided on an upper surface of the shelf and supplies the book placed on the shelf to an inlet of the carrying-out unit; and a lifting mechanism that lifts or lowers the shelf in accordance with a thickness of the book placed on the shelf, wherein in the handover mode, when the prescribed amount of books is gathered on the shelf, the conveyor supplies the prescribed amount of books gathered on the shelf to the carrying-out unit, and in the gathering mode, in accordance with a situation in which the book gathering unit becomes full or a situation in which a set number of books set in advance are gathered in the book gathering unit, the three-edge trimmer is stopped.

2. The three-edge trimmer according to claim 1, wherein when the book gathering unit operates in the handover mode, every time the book is placed on the shelf, the shelf of the book gathering unit is lowered from a position at the same height as an outlet of the trimming unit by an amount corresponding to a thickness of the book, and when the prescribed amount of books is gathered on the shelf, the shelf is raised or lowered to the same height as an inlet of the carrying-out unit and stopped, the conveyor supplies the prescribed amount of books to the carrying-out unit, and thereafter, the shelf is located at the same height as the outlet of the trimming unit in order to accept the next book, and when the book gathering unit operates in the gathering mode, every time the book is placed on the shelf, the shelf of the book gathering unit is lowered from a position at the same height as the outlet of the trimming unit by an amount corresponding to a thickness of the book until the maximum number of books that can be accommodated by the book gathering unit or the prescribed amount of books is gathered on the shelf.

3. The three-edge trimmer according to claim 2, wherein the carrying mechanism has: a chuck head that is capable of holding the processed book; a guide that extends from the trimming unit to above the shelf of the book gathering unit, the chuck head being slidably attached to the guide; and a chuck head driving mechanism that reciprocally moves the chuck head along the guide. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ At the end of the processing by the cutting unit each time, the chuck head moves the processed book from the cutting unit toward the book gathering unit, and releases the book on the shelf when reaching the shelf, and then moves toward the cutting unit in order to hold the next book, whereby the book is transported from the cutting unit to the book gathering unit.

4. The three-edge trimmer according to claim 3, wherein A photoelectric sensor that detects the book placed on the shelf of the book gathering unit is provided at the exit of the cutting unit, and the photoelectric sensor is set to be in an on state when the book on the shelf horizontally blocks the height position of the photoelectric sensor, and in an off state when the book on the shelf does not horizontally block the height position of the photoelectric sensor, The shelf starts descending at the time point when the chuck head releases the book, and stops descending at the time point when the photoelectric sensor becomes in the off state, whereby the shelf descends by an amount corresponding to the thickness of the book each time the book is placed on the shelf.

5. The three-edge trimmer according to claim 2, wherein A proximity sensor is provided at one of the book gathering unit and the shelf of the book gathering unit, and a detected plate that is paired with the proximity sensor is provided at the other of the book gathering unit and the shelf of the book gathering unit, or a proximity sensor is provided at one of the cutting unit and the shelf of the book gathering unit, and a detected plate that is paired with the proximity sensor is provided at the other of the cutting unit and the shelf of the book gathering unit, The proximity sensor detects the detected plate when the shelf reaches the height position of the entrance of the book removal unit, When the book gathering unit is operated in the handover mode, the shelf on which the prescribed number of books is placed is raised or lowered, and each time the proximity sensor detects the detected plate, the movement of the shelf is stopped and the conveyer supplies the prescribed number of books to the book removal unit.

6. The three-edge trimmer according to claim 2, wherein During the period until the book on the shelf reaches the prescribed number, the conveyer of the book gathering unit alternately repeats the advancing movement and the retreating movement by a constant distance each time a constant number of books are gathered on the shelf, whereby the books are placed on the shelf in an alternately staggered state.

7. The three-edge trimmer according to claim 1, wherein The height of the entrance of the book removal unit is changeable.

8. The three-edge trimmer according to claim 1, wherein The book removal unit is constituted by a belt conveyer or a drive roller conveyer or a free roller conveyer.

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