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420results about "Book making processes" patented technology

Medium processing device, storage medium, and image forming system

A medium processing apparatus includes a liquid applier, a crimper, a stapler, and circuitry. The liquid applier applies liquid to a liquid application position of a medium. The crimper presses and deforms at least a part to which the liquid is applied by the liquid applier, to bind a plurality of media including the medium to which the liquid is applied. The stapler performs stapling with a staple on a medium bundle in which the plurality of media is bound by the crimper. The circuitry controls operations of the crimper, the liquid applier, and the stapler, and selectively switches between first binding performed by the liquid applier and the crimper and second binding performed by only the stapler, in accordance with information on the medium or a binding position at which the medium bundle is bound by the crimper.
Owner:RICOH CO LTD

Sheet postprocessing device that performs postprocessing on plurality of sheets stacked, and image forming system including same

A sheet postprocessing device includes a saddle binding device configured to stack a plurality of recording sheets on a table, abut leading edges of the respective recording sheets against a leading edge cursor, thus to align the leading edges with each other, and bind the center of the recording sheets and fold the recording sheets, and a first pressing member supported so as to pivot in a direction toward and away from the table. The first pressing member is made to pivot toward the table by self-weight thereof, allows the leading edge of the recording sheet delivered to the table to pass toward the leading edge cursor, and presses a portion of the recording sheet in a proximity of the leading edge, at a position upstream of the leading edge cursor, in a delivery direction of the recording sheet.
Owner:KYOCERA DOCUMENT SOLUTIONS INC

Dynamic mismatch correction system and method for book binding machines

Systems and methods are provided for automatically correcting book portion mismatches in a book binding operation. First sensor outputs relate to a first book portion sequence along a first assembly channel, and second book portion sequence along a second assembly channel, each leading into a book binding stage. A mismatch state between first and second book portions is predicted based on the respective sequences and a defined book assembly batch, responsive to which an intervention event is selected and executed. One such intervention event includes selective routing of the first and / or second book portion associated with predicted mismatch states into a correction channel and reinsertion of the first and / or second book portion into the respective assembly channel corresponding to a modified version of the respective sequence. In some embodiments, a further sensor may be provided at the book binding stage entry for further confirmation / control feedback regarding matched book portions.
Owner:LIGHTNING SOURCE LLC

Novel device for enabling section to enter book clamping device

The utility model discloses a novel device for enabling sections to enter a book clamping device, which comprises an upper section conveying device, the upper section conveying device is arranged above a book clamping conveying line, book clamping fixing plates are uniformly arranged on a conveying chain of the book clamping conveying line, an inner baffle is fixed on the upper surface of each book clamping fixing plate, and a lower baffle is fixed on the lower surface of each book clamping fixing plate. A movable book clamping plate in sliding connection is arranged on one side of the lower end of the book clamping fixing plate, the movable book clamping plate corresponds to the book clamping fixing plate front and back, an outer baffle is fixed to the upper surface of the movable book clamping plate, an overturning stop rod assembly is installed on the upper surface of the movable book clamping plate, and the overturning stop rod assembly is located at one end of the inner baffle and one end of the outer baffle. The section rotates anticlockwise in the book clamping device, so that the section is automatically overturned and connected in the book clamping device; the mode that a section enters a book clamping device in the traditional sense is broken through, so that the production and manufacturing cost of the equipment is reduced, and the function that the test paper perfect binding linkage line can perfect and bind conventional books and periodicals (32 / 16) is achieved.
Owner:XINXIANG BRIX MASCH CO LTD

Sorting device for sorting book blocks

A sorting device for sorting book blocks is described, the sorting device having a filling station for sorting one or more book blocks into receptacles, a first input conveyor configured to feed book blocks to the filling station, a second input conveyor configured to feed empty receptacles to the filling station, a first output conveyor configured to transfer full receptacles away from the filling station, the filling station comprising a plurality of inserting devices configured to insert the one or more book blocks into the receptacles, wherein the sorting device further includes a control device configured to receive sorting information of the one or more book blocks and to control the inserting devices to sort the one or more book blocks into the receptacles using the sorting information.
Owner:HUNKELER AG

Booklet manufacturing apparatus that manufactures booklet by adhering plurality of sheets

A heater heats sheets to which a powder adhesive has been applied in a binding margin. A pressing member manufactures a booklet by applying pressure to the sheets. In a first adhesion mode, an application amount of the powder adhesive applied to the binding margin is a first application amount and a heat parameter proportional to an amount of heat applied to the sheets is a first value. In a second adhesion mode, the application amount of the powder adhesive applied to the binding margin is a second application amount and the heat parameter is a second value. The first value is higher than the second value. The first application amount is lower than the second application amount.
Owner:CANON KK

Synchronous adjusting device capable of achieving online adjustment based on angular difference and differential gear train and used for adhesive binding machine

The invention relates to the technical field of printing equipment, and discloses an on-line adjustable synchronous adjusting device for an adhesive binding machine based on an angular difference differential gear train, which comprises a three-dimensional box seat serving as a basic carrier of the equipment and used for providing an integral structure support and a mounting foundation; the differential gear train mechanism is mounted on one side of the three-dimensional box seat and is used for realizing motion synthesis and relative angle adjustment; the gear transmission mechanism is arranged at the top of the three-dimensional box seat and used for providing external power for the differential gear train mechanism; the difference angle adjusting mechanism is installed at the bottom of the three-dimensional box base and used for adjusting the relative position. Through motion synthesis of the differential gear train mechanism and control of a servo motor of the differential angle adjusting mechanism, synchronous adjustment of the book clamping device and the push gauge in the operation process is achieved, and therefore when the book clamping device clamps a book block to move, the high-precision synchronous motion effectively solves the problem that a cover is not accurately pasted. And the processing quality of the adhesive binding process is greatly improved.
Owner:JMD MASCH CORP LTD

Book processing method and device

The invention discloses a book processing method and device, and the method comprises the steps: transmitting all books through a book bearing mechanism according to a set path, lifting any book to a specific position through a part with a lifting function on the book bearing mechanism after the book enters the specific position of the book bearing mechanism, and carrying out the lifting of the book. The remaining books are continuously conveyed to the next specific position of the book bearing mechanism according to the set route to be lifted or enter the next processing procedure; the cover / back cover and the inner pages of the raised book are processed, and the processed book is moved to a set path of the book bearing mechanism to be continuously conveyed. According to the book bearing mechanism, the rising height can be adjusted according to books with different thicknesses, so that the height of the upper surface of the book with any thickness can be at the target height position, and all the mechanisms can conveniently process the books.
Owner:GUANGZHOU STANDARD CONTROL TECH CO LTD

Inspection system, inspection method, and inspection program

To enable inspection of a bundle comprising a plurality of sheets of recording medium.SOLUTION: An inspection system of the present invention comprises an acquisition unit for acquiring information on the shape of a bundle comprising a plurality of sheets of processed recording medium, and a determination unit configured to inspect the bundle on the basis of the information acquired by the acquisition unit.SELECTED DRAWING: Figure 4
Owner:KONICA MINOLTA INC

Bottom lock type back wrapping sewing machine

The utility model relates to the technical field of paper bottom locking type sewing equipment, in particular to a bottom locking type back wrapping sewing machine which comprises a feeding platform, a sewing machine and a thread feeding and cutting machine are installed on the feeding platform, a pressing mechanism is installed at one end of the feeding platform, a back strip compacting wheel is installed in the middle of the pressing mechanism, and a back strip is arranged on the back strip compacting wheel. A back strip conveying wheel and a gluing groove are arranged on the lower portion of the pressing mechanism, an adjustable limiting assembly is installed at one end of the back strip pressing wheel, and a stacking platform is installed below the adjustable limiting assembly. The bottom lock type back wrapping sewing machine is simple in structure and convenient to operate, the production process is smoother, manual intervention is reduced, the downtime is shortened, and therefore the overall production efficiency is improved. The equipment has excellent adaptability and can be flexibly adjusted according to the thicknesses and sizes of different pieces of paper, accurate pressing force control is achieved through the pressing mechanism, and the sewing precision and the product quality are ensured.
Owner:HUBEI BLUEPRINT CO LTD

Double-working-condition transmission instrument and book sticker collating machine

The invention provides a double-working-condition transmission instrument. The double-working-condition transmission instrument comprises a supporting platform and a driving mechanism arranged in the supporting platform. The invention further provides a book collating machine which comprises the double-working-condition transmission instrument and a plurality of collating mechanisms arranged at the top of a supporting platform, and each collating mechanism comprises a fixed base and a book material table fixed to the fixed base. A double-working-condition transmission instrument is combined with a high-performance collating mechanism, so that when the collating machine faces ultrahigh production efficiency, precise parts such as an adsorption part, a page supporting hook and a connection claw of each collating mechanism do not need to be forcibly solved to operate at physical limit frequency, and the collating machine is switched to a non-1: 1 working condition, so that the collating efficiency of the collating machine is greatly improved. Therefore, the mechanisms can work at a looser and more stable action frequency. Therefore, the problems of pulling damage, unstable adsorption, inaccurate handover and the like of the book sections caused by too fast action are fundamentally avoided, and the extremely high reliability in the book section separating, transferring and conveying processes can still be ensured while the yield leap is achieved.
Owner:XIANGYANG JINGXINGDA MASCH TECH CO LTD

Additional member attaching apparatus and binding system including the same

The embodiment includes: a roll accommodation unit 3 that accommodates a roll 2 of a continuous sheet of additional member Q; an unwinding unit 5 that unwinds and draws the additional member from the roll accommodation unit to a trimming station 4; a trimming unit 8 that is arranged in the trimming station and cuts and trims the additional member in accordance with the size of a book block B to form a strip of additional member; a gripper 12 that grips the strip of additional member while supporting the under face thereof, moves between a retracted position inside a housing 52 and a forward position outside the housing 52, and moves between the forward position and a raised position above the forward position; and a handover unit 23 that hands over the strip of additional member from the trimming station to the gripper located in the retracted position.
Owner:HORIZON INC

Arc-shaped mounting pushing elastic piece and mounting pushing groove for paperboard book

The utility model relates to the technical field of book production, and discloses an arc-shaped mounting-pushing elastic piece and a mounting-pushing groove for a paperboard book, the arc-shaped mounting-pushing elastic piece for the paperboard book comprises an elastic piece body, the elastic piece body comprises a mounting-pushing part and a connecting part, the mounting-pushing part is arc-shaped, the mounting-pushing part protrudes back to the connecting part, and the mounting-pushing groove is formed in the mounting-pushing part. The mounting pushing part is connected with the connecting part, and a through hole is formed in the connecting part. The arc-shaped mounting pushing elastic piece for the paperboard book is designed to be of a structure comprising the connecting part and the arc-shaped mounting pushing part, when a book page makes contact with the mounting pushing part, the corner of the book page is not prone to being damaged, in addition, a connecting hole is formed in the connecting part, and the arc-shaped mounting pushing elastic piece for the paperboard book can be conveniently fixed by arranging a screw in the through hole in a penetrating mode.
Owner:FOSHAN JINYE YINGXIN INTELLIGENT MASCH CO LTD

Digitally-based printed book production plant having one or more book block forming stations and one or more cover stitchers, and related methods

PendingJP2024525987A5ConveyorsBook making processes
A production plant (22) for books (23) printed using digital technology, comprising one or more forming stations (26) for book blocks (32), one or more cover stitchers (27) for assembling the book blocks with their respective covers (33), an electronic center (29), and a number of spiral towers (39) for receiving the book blocks of the forming stations and transferring them to the stitchers. The book blocks and the covers have respective book codes (34) and cover codes (36) that are uniquely associated with each book of a given work order. Each tower (39) includes a conveyor belt (42) that can be moved along a spiral path, a belt motorization group, and an electronic control unit (44). The towers serve as a temporary storage for the blocks and a capacity for movement between a loading area (49) adjacent to the forming stations and an unloading area (50) adjacent to the stitchers.
Owner:エッセ·エ·エンメ·セルビッツィ·エディトリアリ·ミラノ·ソチエタ·ペル·アツィオーニ

Gluing device for exercise book binding

The gluing device comprises two conveying frames, an installation frame is fixedly connected between the tops of the two conveying frames, an installation groove is formed in the top of the inner wall of the installation frame, a first motor is installed on one side of the installation frame, and a second motor is installed on the other side of the installation frame. The output end of the first motor penetrates through the mounting groove and is fixedly connected with a two-way threaded rod, the outer surface of the two-way threaded rod is in threaded connection with a convex plate, and mounting plates are fixedly connected to the tops of the two conveying frames. Through cooperative use of the mounting rack, the mounting groove, the first motor, the bidirectional threaded rod, the convex plate, the mounting plate, the limiting opening, the shielding assembly and other structures, the gluing range can be adjusted, matched gluing treatment can be conducted according to the size of an exercise book, the situation that glue is wasted in the gluing process is avoided, and the gluing efficiency is improved. And the practicability of the gluing device for exercise book binding is improved.
Owner:ANHUI JIEPIN TECH DEV CO LTD

Width-adjustable page receiving platform structure

The utility model relates to the technical field of page mounting book production, and discloses a width-adjustable page receiving platform structure which comprises a machine frame. A first page receiving plate; a page receiving groove is formed between the first page receiving plate and the second page receiving plate; and the adjusting mechanism is arranged on the rack and drives the first page receiving plate and the second page receiving plate to get away from each other or get close to each other to change the width of the page receiving groove. According to the page receiving platform structure with the adjustable width, the width between the first page receiving plate and the second page receiving plate is changed through the adjusting mechanism, when adjustment needs to be conducted according to pages with different widths, the first page receiving plate and the second page receiving plate do not need to be manually disassembled and assembled, and operation is more convenient.
Owner:FOSHAN JINYE YINGXIN INTELLIGENT MASCH CO LTD

Page turning and bending device

The invention discloses a page turning and bending device. The page turning and bending device comprises a rack; the conveyor is arranged on the rack, and the conveyor is provided with a first push plate assembly and a second push plate assembly; the positioning mechanism is arranged between the first push plate assembly and the second push plate assembly; the page turning mechanism is arranged on the rack and between the first push plate assembly and the second push plate assembly and comprises a bending assembly and an air blowing part, the bending assembly comprises a first driving part, a first baffle and a first pressing roller, and the first baffle and the first pressing roller are arranged at intervals in the horizontal direction; the first driving component drives the first baffle and the first pressing roller to move in the vertical direction at the same time. The book is sucked by the positioning mechanism, the book is pushed by the second push plate assembly, the sucked bottommost page is turned outwards, then the bottommost page is blown up by the blowing part and erected between the first baffle and the first pressing roller, the bending part descends, the book is driven by the first push plate assembly to move, the bottommost page is bent and bonded to the book, and the production efficiency is improved.
Owner:JIANGMEN ZHICHUANGLI TECH CO LTD

A glue binding machine with repeated milling and gluing mechanism

A glue binding machine with a repeated milling and gluing mechanism comprises a platform, a clamping device arranged on the platform in sequence along the direction of the first paper milling, a bottom glue gluing device, two symmetrically arranged side glue gluing devices, a back milling device, a power device arranged below the platform, and a transport vehicle for clamping inner pages. It also comprises a switching mechanism arranged on the side glue gluing device for separating the side glue gluing device. The switching mechanism comprises a supporting plate arranged on the side glue gluing device, a force-bearing plate arranged on the support plate, a limiting part for changing the movement direction of the support plate after the support plate is subjected to force, so that the two symmetrically arranged side glue gluing devices move away from each other, and a resetting component for driving the support plate to reset. The present invention has a stable structure, a low failure rate, a long service life, and a high gluing efficiency.
Owner:NINGHE TECHNOLOGY SERVICES (NANJING) CO LTD

Bookblock shaping and multi-compaction mechanism and system

The invention discloses a book block shaping and multi-compaction mechanism and system, and relates to the technical field of book production, the book block shaping and multi-compaction mechanism comprises an equipment frame, a feeding conveying belt and a discharging conveying belt are arranged on the two sides of the equipment frame respectively, and a primary compaction module, a secondary compaction module, a tertiary compaction module, a first compaction driving module and a second compaction driving module are installed at the top of the interior of the equipment frame respectively. The compaction module comprises a fixed pressing table and a movable pressing table, and the movable pressing table achieves movement and reset of a small pressing plate or a large pressing plate through a special structure when stressed so as to compact different parts. And the first compaction driving module and the second compaction driving module respectively drive the corresponding compaction modules to act. The control system comprises a control unit, a driving control module, a conveying control module and a sensor group. The control unit receives signals of the sensors and sends out instructions, the driving control module controls the driving component, the conveying control module controls starting, stopping and intermittent conveying of the conveying belt, and the sensor set detects the positions of the book blocks and the compaction pressure. The bookblock compacting device can obviously improve the bookblock compacting quality and efficiency, and is suitable for batch production requirements.
Owner:DONGGUAN ZHANZHI PRECISION MASCH CO LTD

A book processing adhesive binding production line and a book mouth pressing machine connecting transfer device

The application discloses a book processing glue binding production line and a mouth pressing machine connecting transfer device, relates to the application field of a mouth pressing machine transfer feeding device, and comprises a mouth pressing machine, one side of the mouth pressing machine is provided with a conveying belt, the conveying belt is connected with a driving device, the top of the conveying belt is provided with a mounting bracket, the side of the mounting bracket is provided with a guide rod, the outer part of the guide rod is movably provided with a movable seat, the inner side of the movable seat is movably provided with a moving block, one side of the moving block is provided with a fixing rod, the outer part of the fixing rod is provided with a spring, and the fixing rod and the movable seat are movably and penetratively arranged, and the side of the moving block is rotatably connected with a righting assembly. The righting assembly is arranged, so that workers can conveniently and quickly add new books to be pressed. The righting assembly body is in an equilateral triangle structure, contains a long righting surface and a short righting surface, and the righting assembly is used for abutting against books by using the long righting surface under the reset action of the spring, so that the books on the conveying belt can be stably fed.
Owner:TAIZHOU CHENGUANG PRINTING CO LTD

Sheet bundle binding apparatus and rotation detection method

Provided is a saddle stitch folding apparatus including: a stitcher unit; a reel support unit configured to support a reel rotatably about the axis with a support shaft being inserted in a through-hole formed in the reel; and a rotation detecting mechanism configured to detect a rotation state of the reel, and the rotation detecting mechanism has an adhering member that is rotated while adhered to a bottom face of the reel, a rotating member having an insertion hole inserted in the support shaft, and a rotation detecting unit configured to detect the rotation state of the rotating member.
Owner:HORIZON INC

Bookblock side edge gluing mechanism

The utility model relates to the technical field of bookblock processing equipment, in particular to a bookblock side edge gluing mechanism which comprises a supporting frame, and a first movable seat and a second movable seat which can move close to each other or away from each other are arranged on the supporting frame. The first movable seat and the second movable seat transversely move, the moving direction is perpendicular to the conveying direction of the book block, a first gluing wheel is horizontally and rotatably arranged on the first movable seat, and a second gluing wheel with the rotating direction opposite to the rotating direction of the first gluing wheel is horizontally and rotatably arranged on the second movable seat; a gap for a book block to pass through is formed between the first gluing wheel and the second gluing wheel; a first glue supply part for supplying glue to the first gluing wheel is arranged on the first movable seat, and a second glue supply part for supplying glue to the second gluing wheel is arranged on the second movable seat. By arranging the first glue supply part and the second glue supply part, glue can be continuously supplied to the first gluing wheel and the second gluing wheel, the situation of glue breakage is prevented, and the smoothness of the gluing procedure is kept.
Owner:DONGGUAN HAOXIN PRECISION MASCH CO LTD

Bookbinding system and bookbinding apparatus

The adhesive applied to the spine of the booklet is cooled sufficiently, and the transport distance of the transport device that carries the booklet from the binding machine to the cutting machine is shortened. [Solution] The bookbinding apparatus 100 includes a first transport unit that transports booklet B along a first transport path, a gluing unit that glues the spine of booklet B transported along the first transport path, a cover attachment unit that attaches a cover to the spine of glued booklet B, a second transport unit 20 that transports booklet B with the cover attached along a second transport path F2 and discharges it to a transport device, a booklet supply unit that supplies booklet B with the cover attached from the first transport path to the second transport path F2, and a housing that houses the first transport unit, the gluing unit, the cover attachment unit, the second transport unit 20, and the booklet supply unit, wherein the second transport path F2 is longer than the straight-line distance L1 connecting the supply position Po1 where booklet B is supplied from the booklet supply unit to the second transport path F2 and the discharge position Po2 where booklet B is discharged from the second transport path F2 to the transport device.
Owner:HORIZON CO LTD

Automatic book glue line machine

The present invention discloses an automatic book glue line machine, including a frame, a flipping mechanism, a front and back pushing feeding mechanism, a clamping feeding mechanism, a glue line mechanism and a discharging mechanism. The flipping mechanism is arranged at the feeding end of the frame, and the discharging mechanism is arranged at the discharging end of the frame. The front and back pushing feeding mechanism, the clamping feeding mechanism and the discharging mechanism are arranged in sequence on the frame. The glue line mechanism is arranged on the frame and is located above the clamping feeding mechanism. By providing a flipping mechanism, the book placed horizontally in the previous process can be turned to a vertical state, which is convenient for the glue line mechanism to glue both sides of the book at the same time; by providing a clamping feeding mechanism, it is convenient to clamp and convey the book, which is convenient for the transportation of the book; and by providing a discharging mechanism, it is convenient for the book to be discharged and processed. As a result, the entire book glue line process does not require manual operation, which greatly saves manpower, and each mechanism acts continuously, which improves the compactness of the entire equipment structure and reduces the overall occupied space.
Owner:FO SHAN SHI LV ZHI CAI YIN SHUA YOU XIAN GONG SI

Preset hole site adjusting workbench and binding machine

A preset type hole position adjusting workbench and binding machine comprises a movable plate, a movable plate, a movable plate and a movable plate, the frame is located below the movable plate, a guide rail is arranged on the frame, and a sliding block is arranged on the guide rail in a matched mode; the driving assembly is fixed to the frame and comprises a motor and a conveying belt connected with the motor through a synchronous wheel. The conveying belt is parallel to the guide rail, and a belt pressing plate is further arranged on the conveying belt in a matched mode. The moving plate is connected with the sliding block and the belt pressing plate. Based on a preset hole position, the motor can drive the conveying belt to drive the moving plate and a binding object to step along the guide rail together through the belt pressing plate so as to complete drilling or rivet pressing of a corresponding hole position. On the basis of the preset hole position, the stapling object can be automatically driven to be drilled or riveted in batches, the overall structure is simple, design is reasonable, manual interference adjustment is not needed, the accuracy of the drilling or riveting quality can be guaranteed, and the stapling efficiency is high.
Owner:TIANJIN WANMING JIALONG TECHNOLOGY DEVELOPMENT CO LTD

Section feeding device and section ridge cloth wrapping system

The utility model provides a section feeding device and a section ridge cloth wrapping system, which can realize full-mechanical feeding and effectively solve the problems of low production efficiency, poor product quality consistency, high labor intensity of workers and the like in the prior art. A section feeding device comprises a positioning mold which is configured to be suitable for positioning sections; the material storage unit comprises a material bin, a material supporting disc and a lifting mechanism, an opening is formed in the top of the material bin, the material supporting disc is arranged in the material bin, and the lifting mechanism is configured to be capable of driving the material supporting disc to ascend and descend; the pre-lifting mechanism is arranged above the storage unit, and the pre-lifting mechanism is configured to be capable of lifting the sections from the stock bin and transferring the sections to a first position; and the feeding manipulator is configured to grab the section at the first position and transfer the section to the positioning mold.
Owner:RR DONNELLEY (GUANGDONG) PRINTING SOLUTIONS LTD

Financial bill arranging and binding device

The utility model discloses a financial bill arranging and binding device, which belongs to the technical field of binding devices and comprises a bottom plate, a fixing block is fixedly mounted on one side of the top surface of the bottom plate, a threaded shaft is rotatably connected to the bottom surface of an inner cavity of the fixing block, and a pressing block for pressing financial bills is arranged on the peripheral side of the threaded shaft and positioned in a threaded sleeve of the inner cavity of the fixing block. A connecting block is transversely connected to one side face of the fixed block, sliding rods are fixedly connected to the inner walls of the two sides of the connecting block, clamping blocks used for clamping financial bills sleeve the circumferential sides of the sliding rods, a base plate is fixedly connected to the top face of the connecting block, a threaded rod piece is rotationally connected to the top face of the base plate, and a movable block sleeves the circumferential side of the threaded rod piece in a threaded mode; connecting plates are hinged to the two side faces of the movable block correspondingly, and the free ends of the two connecting plates are hinged to the top faces of the two clamping blocks correspondingly. According to the financial bill arranging and binding device, the problem that dislocation is likely to be generated after financial bills are bound is solved, and the financial bill binding effect is improved.
Owner:ZHEJIANG COLLEGE OF SECURITY TECH