[0030] A vertical shaft 12 is mounted on the bottom surface of the table 10, and the shaft 12 is held so as to be rotatable by a bearing 13 attached to the base 9. A motor 14 is coupled to the shaft 12, whereby the table 10 is rotatably driven by the motor 14. 

[0031] A pressure plate 15 is arranged opposite to the shaft12 above the table 10 forupwardlyand downwardly movement between two positions of a stand-by position at which it is spaced from the bound material 1, and a pressure position at which it presses the bound material 1 against the table 10. The pressure plate 15 is attached to a piston-cylinder device 16 supported by the base 9 such that it can rotate atthe pressure position along with the table 10 and the bound material 1. It is reciprocated between the stand-by position and the pressure position by the drive of the piston-cylinder device 16. 

[0032] After the bound material 1 is positioned by the positioning means 30, 31, 32 and 33, the pressure plate 15 moves to the pressure position so as to fix the bound material 1 to the table 10. After the pressure plate 15 is disposed on the pressure position, the third uprightplate 31, the second upright plate 32 and the chuck 47 (the face 33)ofthe positioning means are separated fromthe bound material 1 in order not to obstruct the rotational movement of the bound material 1. 

[0033] The trim unit 4 has a frame 17. A base portion 18 is attached to the frame 17. When the trim unit 4 is disposed on the trimming position, the base portion 18 supports the bottom surface of the top edge portion 1a, the bottom edge portion 1b or the fore-edge portion 1c ofthe bound material1 placed on the table 10 ofthetable unit 3. 

[0034] A trimcutter20 isarranged opposite to theblade receiving portion 19 above the base portion 18 for up- wardly and downwardly movement. The trim cutter 20 takes two positions of a non-trimming position, at which it is spaced from the blade receiving plate 19,and a trim- ming position, at which it is pushed against the blade receiving portion 19 at its edge. A trim cutter drivi ng mechanism 21 is attached tothe frame 17 for reciprocat- ing the trim cutter 20 between the trimming position and the non-trimming position. 

[0035] The trim unit 4 comprises the blade receiving portion 19 for receiving the trim cutter 20. The blade re- ceiving portion19isfixedto theuppersurface ofthe base portion 18.The blade receivingportion 19is,forexample, made of a rubber material. 

[0036] A pressure portion 22 is arranged above the base portion 18 formovementupwardly and downwardly between two positions of a non-pressing position where it is spaced from the bound material 1, and a pressing position where the bound material 1 is pressed against the base portion 18. The pressure portion 22 is recipro- cated between the non-pressing position and the press- ing position by a pressure portiondrivingmechanism 23. The pressure portion 22 is disposed on the pressing po- sition when the trim cutter 20 moves from the non-trim- ming position tothetrimming position,while the pressure 

portion 22isdisposed on the non-pressing position when the trim cutter 20 moves from the trimming position to the non-trimming position. 

[0037] Two feed screws 5 are arranged horizontally between the table unit 3 and the trim unit 4, and they 5 are spaced from each other. The feed screws 5 are ro- tatably mounted to a support portion (not shown) fixed to another frame (main frame) 38. The frame 17 of the trim unit 4 is engaged with the feed screws 5. The feed screws 5 are coupled to a driving shaftofa motor6 mount- ed on the frame 38, whereby the feed screws 5 are ro- tatably driven by the motor 6. A driving mechanism 56 is composed of the feed screws 5 and the motor 6. The driving mechanism 56 causes the trim unit 4 to move between the trimming position and the stand-by position along the axis direction of the feed screws 5. 

5 

10 

15 

[0038] There is provided a control unit 7 for controlling the operations ofthe table unit3,the trimunit4,the driving mechanism56 (the motor6),theslide driving mechanism and so on. The control unit 7 controls them in such a manner that the trim unit 4 moves from the stand-by po- sition to the trimming position every time the bound ma- terial 1 is arranged at each of the top edge trimming po- sition, the fore-edge trimming position and the bottom edge trimming position,to cuteach ofthe topedge portion 1a,thefore-edge portion 1c andthe bottom edge portion 1b of the bound material 1, respectively. A touch screen 70 is further connected to the control unit 7, so that an operator can set up the table unit 3, the trim unit 4 and the driving mechanism 56 (the motor 6) via the touch screen 70. 

20 

25 

30 

## [Guide portion] 

[0039] Referring to Figs. 4 and 7, a structure of the guide portion will be explained. 

35 

[0040] The trimmer comprises an upper guide portion 60 attached to the pressure portion22,and a lowerguide portion 61 attached to the base portion 18. Each of the guide portions 60,61 is inserted between the book block 51 and the cover 50 so as to peel the flap portions 50a together with the cover 50 up. The peel up process will be explained below. 

40 

[0041] As shown in Fig. 7, each of the guide portions 60,61 isinclinedrelative to the face and reverse surfaces of the book block 51. That’s to say, the guide portions 60,61 are widened toward the trim cutter 20.Each ofthe guide portions 60, 61 comprises one end portion 60a, 61a away from the trim cutter 20, and the other end por- tion 60b, 61b adjacent to the trim cutter 20. The one end portions 60a, 61a are disposed adjacent to the face and reverse surfaces of the book block 51. The other hand, the other end portions 60b, 61b are disposed away from the face and reverse surfaces of the book block 51. 

45 

50 

[0042] As shown inFig.4,thetrimmercomprises a pair of connecting portions 63 attached to the pressure por- tion 22. The trimmer comprises a pair of spring portions 62 mounted on each of the connecting portions 63. The 

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