CN109367271A - A kind of dedicated three holes two-wire punching threading all-in-one machine of archive office - Google Patents

A kind of dedicated three holes two-wire punching threading all-in-one machine of archive office Download PDF

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Publication number
CN109367271A
CN109367271A CN201811645111.2A CN201811645111A CN109367271A CN 109367271 A CN109367271 A CN 109367271A CN 201811645111 A CN201811645111 A CN 201811645111A CN 109367271 A CN109367271 A CN 109367271A
Authority
CN
China
Prior art keywords
rack
perforating mechanism
punching
power
threading
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201811645111.2A
Other languages
Chinese (zh)
Inventor
徐文达
许朋波
相培娟
李振宇
郑丽娜
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Linqu Power Supply Co Of State Grid Shandong Electric Power Co
State Grid Corp of China SGCC
Original Assignee
Linqu Power Supply Co Of State Grid Shandong Electric Power Co
State Grid Corp of China SGCC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Linqu Power Supply Co Of State Grid Shandong Electric Power Co, State Grid Corp of China SGCC filed Critical Linqu Power Supply Co Of State Grid Shandong Electric Power Co
Priority to CN201811645111.2A priority Critical patent/CN109367271A/en
Publication of CN109367271A publication Critical patent/CN109367271A/en
Pending legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B42BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42BPERMANENTLY ATTACHING TOGETHER SHEETS, QUIRES OR SIGNATURES OR PERMANENTLY ATTACHING OBJECTS THERETO
    • B42B5/00Permanently attaching together sheets, quires or signatures otherwise than by stitching
    • B42B5/02Permanently attaching together sheets, quires or signatures otherwise than by stitching by eyelets

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)

Abstract

The invention discloses a kind of dedicated three holes two-wire punching threading all-in-one machines of archive office, including rack, column is provided in rack, the perforating mechanism moved back and forth up and down is movably installed on column, the driving device being connected by power with perforating mechanism is also equipped on column, the lower part of perforating mechanism is correspondingly arranged on the activity orientation clamping plate that front and back moves back and forth, the power mechanism being connected by power with activity orientation clamping plate is installed in rack, the top of perforating mechanism is arranged in the switch of power mechanism, and as the rising of perforating mechanism open and as the decline of perforating mechanism is closed, the lower part of rack is equipped with the rotating shuttle that lock-type chain stitch is constituted with perforating mechanism, rotating shuttle is connected by power with driving device.The present invention is easy to use, reduces operation difficulty, has reached and has realized punching and the primary technical effect completed and improve bookbinding quality of threading.

Description

A kind of dedicated three holes two-wire punching threading all-in-one machine of archive office
Technical field
The present invention relates to office tools fields, more particularly to a kind of dedicated three holes two-wire punching threading one of archive office Machine.
Background technique
At present when carrying out the filing of material, some paper material needs bind into book form.Common practice is first with punching Machine punches material, then is threaded with needle, finally knots.It does so first is that complex procedures, short time consumption are long;Second is that clast is stifled In punching needle head, need to dismantle discharge, and be easy to syringe needle to break disconnected;Third is that being easy to loosen when threading and knotting, influence Bookbinding quality.
Summary of the invention
The problem to be solved in the present invention is in view of the above problems, providing a kind of realization punching and threading is primary completes and improve The dedicated three holes two-wire punching threading all-in-one machine of the archive office of bookbinding quality.
To solve the above problems, the present invention includes rack, it is structurally characterized in that in rack and is provided with column, it is movable on column The perforating mechanism moved back and forth up and down is installed, the driving device being connected by power with the perforating mechanism is also equipped on column, The lower part of perforating mechanism is correspondingly arranged on the activity orientation clamping plate that front and back moves back and forth, and is equipped with and the activity in the rack The top of perforating mechanism is arranged in the power mechanism that positioning splint is connected by power, the switch of the power mechanism, and with punching The rising of mechanism open and as the decline of perforating mechanism is closed, the lower part of the rack is equipped with and the punching Mechanism constitutes the rotating shuttle of lock-type chain stitch, and the rotating shuttle is connected by power with the driving device.
As a kind of specific prioritization scheme, the column includes that pedestal and two are fixedly mounted on the base and mutually Parallel strut is equipped with driving device on the strut of opposing left, is equipped with push-button reset on the strut on opposite right side and opens It closes, is fitted with the drive rod being connected by power with the driving device between two struts, one end of drive rod is connected with rotation Bar.
As a kind of specific prioritization scheme, the perforating mechanism includes the needle stand for being slidably mounted on base right side, the needle The position-arresting disk of the rocker arm cooperation affixed with the rotating bar is installed on seat, is equipped with punching threading needle on the needle stand, it is described U-shaped groove is offered on punching threading needle, and wire lead slot is offered on the outer wall of the punching threading needle, the punching threading needle End is equipped with spring lever.
As a kind of specific prioritization scheme, the spring lever includes sleeve and the compression bar that is inserted into the sleeve, described Sleeve is fixed in the end of the punching threading needle, is set with spring on the compression bar, and the compression bar extends the sleeve End and the push-button reset switch snap fit be arranged.
As a kind of specific prioritization scheme, the activity orientation clamping plate includes the plate for being slidably mounted on the upper rack Body, rectangular slat binding hole corresponding with the punching threading needle is offered on the plate body, and the top of the plate body passes through tight Fixing bolt is equipped with pressing plate, and limit hole corresponding with the binding hole is offered on the pressing plate, and the fastening bolt is pair Claim two of setting.
As a kind of specific prioritization scheme, the power mechanism is threaded through on the plate body including two and rotates in same direction and put down The reciprocating screw rod and rack-mounted rotary electric machine of row setting, the end of reciprocating screw rod is mounted on the machine by bearing block On frame, the one end of reciprocating screw rod is equipped with worm gear, and the worm screw with worm gear is equipped on the line shaft of rotary electric machine, described Rotary electric machine and the switch connect.
As a kind of specific prioritization scheme, the lower part of the rack is equipped with fixing seat, is equipped with and turns in the fixing seat Axis, one end of shaft are equipped with belt pulley and connect with driving device belt, and the other end of shaft is connected by power with the rotating shuttle.
The present invention has the advantage that relative to existing
Using column is provided in rack, it is movably installed with the perforating mechanism moved back and forth up and down on column, is also installed on column There is the driving device being connected by power with perforating mechanism, the lower part of perforating mechanism is correspondingly arranged on the activity orientation that front and back moves back and forth Clamping plate, the power mechanism being connected by power with activity orientation clamping plate is equipped in rack, and the switch of power mechanism is arranged in puncher The top of structure, and with the rising of perforating mechanism carry out open and as the decline of perforating mechanism is closed, the lower part of rack The rotating shuttle that lock-type chain stitch is constituted with perforating mechanism is installed, rotating shuttle is connected by power with driving device;Perforating mechanism is enterprising in column Row, which moves back and forth up and down, can be realized perforating mechanism and carries out punching threading to the paper material bound of needs, activity orientation clamping plate Front and back reciprocating movement is able to drive paper material and moves back and forth, so as to punch perforating mechanism in paper material Threading, in order to run simultaneously perforating mechanism and activity orientation clamping plate, in opening for the power mechanism that the top of perforating mechanism is installed The movement that can be realized positioning splint of stopping action in perforating mechanism punching is closed, switch can be opened when perforating mechanism rises It can be realized the movement of activity orientation clamping plate and perforating mechanism rises, the rotating shuttle of the lower part installation of rack can cooperate perforating mechanism It realizes the bookbinding for constituting lock-type chain stitch to realization to paper material, realize punching and the primary completion of threading and improves bookbinding quality Technical effect.
It include that pedestal and two are fixedly mounted on strut on pedestal and parallel to each other, the strut of opposing left using column On driving device is installed, mounting base is installed on the strut on opposite right side, the lower part of mounting base is equipped with push-button reset and opens It closes, is fitted with the drive rod being connected by power with driving device between two struts, one end of drive rod is connected with rotating bar;Column Strut places driving device, and driving device is transferred power on perforating mechanism and rotating shuttle by drive rod, realizes perforating mechanism With the synchronous operation of rotating shuttle, push-button reset switch can be such that power mechanism runs when perforating mechanism rises, in perforating mechanism Make power mechanism out of service when punching, realizes the sequentially bookbinding to paper material.
Include the needle stand for being slidably mounted on column side using perforating mechanism, is equipped on needle stand and rotating bar is affixed shakes The position-arresting disk of arm cooperation, punching threading needle is fitted on needle stand, is punched and is offered U-shaped groove on threading needle, punches threading needle Wire lead slot is offered on outer wall, the end for punching threading needle is equipped with spring lever;The punching threading needle installed on needle stand can be beaten Hole, the paper scrap discharge that U-shaped groove can generate punching is offered on the threading needle of hole, and wire lead slot can place cord, realize Punching binding is synchronous to be realized.
Using the compression bar that spring lever includes sleeve and is inserted into sleeve, sleeve is fixed in the end of punching threading needle, pressure Spring is set on bar, and compression bar extends the end of sleeve and the snap fit of push-button reset switch is arranged;Because of punching Speed ratio it is very fast, the moving distance of activity orientation clamping plate is restricted, and the cooperation of sleeve and compression bar can be in punching threading needle Rise to certain altitude when just carry out pressing to push-button reset switch power mechanism made to carry out operation activity orientation is driven to press from both sides Plate is translated, and when moving on to highest point on punching threading needle, activity orientation clamping plate has moved a certain distance, beats simultaneously When hole threading needle is moved down, because the spring being set on compression bar, which can apply reaction force to the end of compression bar, makes the end of compression bar It is unlikely to be detached from the pressure of opposite-compacting type reset switch, ensure that the moving distance of activity orientation clamping plate, the end of compression bar is unlikely to When being detached from the pressure of opposite-compacting type reset switch, the movement of activity orientation clamping plate also stops.
Include the plate body for being slidably mounted on upper rack using activity orientation clamping plate, is offered on plate body and punching threading needle The top of corresponding rectangular slat binding hole, the plate body is equipped with pressing plate by fastening bolt, offered on the pressing plate with The corresponding limit hole of the binding hole, the fastening bolt are symmetrically arranged two;Binding hole, which can allow, punches threading needle Punching threading, while when plate body is mobile, the corresponding different location that changes into carries out punching threading, completes the bookbinding to paper material, pressure The cooperation of plate and fastening bolt can be realized the fixation to paper material, to realize its bookbinding.
Include two using power mechanism to be threaded through on plate body and rotate in same direction and reciprocating screw rod disposed in parallel and be mounted on The end of rotary electric machine in rack, reciprocating screw rod is mounted on the rack by bearing block, and the one end of reciprocating screw rod is equipped with Worm gear, the worm screw with worm gear is equipped on the line shaft of rotary electric machine, and rotary electric machine is connected with switch;Reciprocal lead screw is worn It is able to drive plate body on plate body to move back and forth on the rack, the worm and gear between rotary electric machine and reciprocating screw rod can will turn The power-conversion of dynamic motor is controlled when the opening and closing of rotary electric machine at the rotation of reciprocating screw rod by switching.
In conclusion the present invention is easy to use, reduce operation difficulty, reached realization punching and threading it is primary complete and Improve the technical effect of bookbinding quality.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples:
Fig. 1 is structural schematic diagram of the invention;
Fig. 2 is the overlooking structure diagram of Fig. 1;
Fig. 3 is the structural schematic diagram of the perforating mechanism of Fig. 1;
In figure:
1- rack, 2- column, 3- perforating mechanism, 4- rotary electric machine, 5- activity orientation clamping plate, 6- reciprocating screw rod, 7- rotating shuttle, 8- branch Bar, 9- drive rod, 10- rotating bar, 11- mounting base, 12- push-button reset switch, 13- needle stand, 14- rocker arm, 15-U connected in star, 16- wire lead slot, 17- spring lever, 18- sleeve, 19- compression bar, 20- spring, 21- plate body, 22- limit hole, 23- pressing plate, 24- fastening Bolt, 25- punch threading needle, 26- worm gear, 27- worm screw.
Specific embodiment
In the present invention, for ease of description, shown in referring to Figures 1 and 2, the up and down direction of Fig. 1 is the upper of perforating mechanism 3 Lower reciprocating direction, the left and right directions of Fig. 1 are the left and right sides of column 2 to the up and down direction of Fig. 2 is before activity orientation clamping plate 5 Reciprocating direction afterwards;Referring to Fig.1 shown in -3, the dedicated three holes two-wire of the archive office, which punches, threads all-in-one machine, including rack 1, in rack 1 It is provided with column 2, column 2 includes that pedestal and two are fixedly mounted on strut 8 on pedestal and parallel to each other, is located at chassis left side Strut 8 on driving device is installed, mounting base 11 is installed on the strut 8 of base right side, the lower part peace of mounting base 11 Equipped with push-button reset switch 12, the drive rod 9 being connected by power with driving device, the phase of drive rod 9 are fitted between two struts 8 Rotating bar 10 is connected with to right end, perforating mechanism 3 is installed on the right side of column 2, perforating mechanism 3 includes moving back and forth up and down Be mounted on the needle stand 13 of base right side, the rocker arm 14 affixed with rotating bar 10 be installed on needle stand 13, rocker arm 14 include two at The swing rod of acute angle is rotatably equipped with balance wheel on the end of swing rod, and the position-arresting disk of above-mentioned rocker arm cooperation, limit are fixedly installed on needle stand Position disk is octagonal, and uniformly there are four limit bases for installation on position-arresting disk, and limit base is equipped with above-mentioned swing rod, in swing rod When carrying out circular motion, one of swing rod is carried out
It is equipped with punching threading needle 25 on needle stand 13, punches and offers U-shaped groove 15 on threading needle 25, outside punching threading needle 25 Wire lead slot 16 is offered on wall, the end of punching threading needle 25 is equipped with spring lever 17, and spring lever 17 and push-button reset switch 12 are coupled;Above-mentioned driving device is rotary electric machine 4.
Referring to shown in Fig. 2, two reciprocating screw rods 6 that axial direction is arranged along the longitudinal direction are equipped in rack 1, toward multifilament It is fitted with the bearing block to fixed reciprocating screw rod 6 in 1 position of rack on bar 6, rotation electricity is installed on the side wall of rack 1 Machine 4, worm screw 27 is provided on the line shaft of rotary electric machine 4, and the end of reciprocating screw rod 6 is equipped with the worm gear cooperated with worm screw 27 26, rotary electric machine 4 is connect with above-mentioned push-button reset switch 12, and the activity that front and back moves back and forth is equipped on reciprocating screw rod 6 Positioning splint 5, activity orientation clamping plate 5 include the plate body 21 for being slidably mounted on 1 top of rack, offer on plate body 21 and wear with punching The top of the corresponding rectangular slat binding hole of line needle 25, plate body 21 is equipped with pressing plate 23 by fastening bolt 24, and pressing plate 23 is opposite It can move up and down in plate body 21, limit hole 22 corresponding with binding hole is offered on pressing plate 23, fastening bolt 24 is symmetrically to set Two set, fastening bolt 24 sets up separately at the both ends of pressing plate 23.
Shown in referring to Fig.1, the lower part of rack 1 is equipped with fixing seat, and shaft, one end installation of shaft are equipped in fixing seat There is belt pulley to connect with driving device belt, the other end of shaft is equipped with the rotating shuttle for constituting lock-type chain stitch with punching threading needle 25 7, rotating shuttle 7 can move back and forth up and down primary with punching threading needle 25 and rotate a circle, and rotating shuttle 7 herein includes shuttle race, rotating shuttle Skin, rotating shuttle plate and rotating shuttle frame, rotating shuttle frame are fixed in shaft, and shuttle race point catches on wire loop, by rotating shuttle rack hook carry out separated time, Make it around shuttle core sheath and shuttle frame bottom and top, forms wire loop from off-line from 7 wrench of rotating shuttle, rotating shuttle 7 herein belongs to existing Technology seldom repeats herein.
Shown in referring to Figure 1 and Figure 3, above-mentioned spring lever 17 includes sleeve 18 and the compression bar 19 being inserted into sleeve 18, set Cylinder 18 is fixed in the end of punching threading needle 25, is set with spring 20 on compression bar 19, and compression bar 19 extends the end of sleeve 18 It is arranged with the snap fit of push-button reset switch 12;The setting of spring lever 17 is because the speed ratio of punching is very fast, and activity is fixed The moving distance of position clamping plate 5 is restricted, and the cooperation of sleeve 18 and compression bar 19 can be certain in arriving for the punching rising of threading needle 25 When height just to push-button reset switch 12 carry out pressing make power mechanism carry out operation drive activity orientation clamping plate 5 carry out it is flat It moves, when moving on to highest point on punching threading needle 25, activity orientation clamping plate 5 has moved a certain distance, while punching is worn When line needle 25 is moved down, because the meeting of spring 20 being set on compression bar 19 applies reaction force to the end of compression bar 19 and makes compression bar 19 End be unlikely to be detached from opposite-compacting type reset switch pressure, ensure that the moving distance of activity orientation clamping plate 5, the end of compression bar 19 When portion is unlikely to be detached from the pressure of opposite-compacting type reset switch, the movement of activity orientation clamping plate 5 also stops.
In the use of the present invention, paper material is fixed on the plate body 21 of activity orientation clamping plate 5 first, with 23 He of pressing plate Fastening bolt 24 is fixed, and the punching threading needle 25 for starting perforating mechanism 3 punches paper material, due to punching threading needle 25 Rotating shuttle 7 of the lower part with setting can constitute lock-type chain stitch with punching threading needle 25, as the rising of perforating mechanism 3 can make power The rotation that mechanism carries out driving reciprocating screw rod 6 drives activity orientation clamping plate 5 to be moved, and repeats above-mentioned punching threading movement, Until having beaten three holes, reciprocator drives activity orientation clamping plate 5 to carry out reply movement, then repeats above-mentioned punching threading The bookbinding movement of three hole two-wires is completed in movement, is then cut cord and is bound, completion bound to paper material At;Above-mentioned a series of actions, which can reach, realizes punching and the primary technical effect completed and improve bookbinding quality of threading.

Claims (7)

1. a kind of dedicated three holes two-wire punching threading all-in-one machine of archive office, including rack (1), it is characterised in that rack is set on (1) Be equipped with column (2), the perforating mechanism (3) moved back and forth up and down be movably installed on column (2), be also equipped on column (2) with The driving device that the perforating mechanism (3) is connected by power, the lower part of perforating mechanism (3) are correspondingly arranged on the work that front and back moves back and forth It moves positioning splint (5), the power mechanism being connected by power with the activity orientation clamping plate (5) is installed on the rack (1), it is described The switch of power mechanism is arranged on the top of perforating mechanism (3), and as the rising of perforating mechanism (3) open and with beating The decline of holes mechanism (3) is closed, and the lower part of the rack (1), which is equipped with, constitutes lock-type chain stitch with the perforating mechanism (3) Rotating shuttle (7), the rotating shuttle (7) is connected by power with the driving device.
2. the dedicated three holes two-wire punching threading all-in-one machine of archive office as described in claim 1, it is characterised in that the column (2) It is fixedly mounted on the base and strut (8) parallel to each other including pedestal and two, is installed on the strut (8) of opposing left There is driving device, is equipped with mounting base (11) on the strut (8) on opposite right side, the lower part of the mounting base (11) is equipped with pressing Formula reset switch (12) is fitted with the drive rod (9) being connected by power with the driving device between two struts (8), is driven One end of bar (9) is connected with rotating bar (10).
3. the dedicated three holes two-wire punching threading all-in-one machine of archive office as claimed in claim 2, it is characterised in that the puncher Structure (3) includes the needle stand (13) for being slidably mounted on base right side, is equipped on the needle stand (13) solid with the rotating bar (10) The position-arresting disk of rocker arm (14) cooperation connect, punching threading needle (25), the punching threading needle are equipped on the needle stand (13) (25) it offers U-shaped groove (15), is offered wire lead slot (16) on the outer wall of punching threading needle (25), the punching is worn on The end of line needle (25) is equipped with spring lever (17).
4. the dedicated three holes two-wire punching threading all-in-one machine of archive office as claimed in claim 3, it is characterised in that the spring lever It (17) include sleeve (18) and the compression bar (19) being inserted into the sleeve (18), the sleeve (18) is fixed in the punching and wears The end of line needle (25) is set with spring (20) on the compression bar (19), and the compression bar (19) extends the sleeve (18) End and the push-button reset switch (12) snap fit be arranged.
5. the dedicated three holes two-wire punching threading all-in-one machine of archive office as claimed in claim 3, it is characterised in that the activity is fixed Position clamping plate (5) includes the plate body (21) for being slidably mounted on the rack (1) top, offers on the plate body (21) and beats with described The top of the corresponding rectangular slat binding hole of hole threading needle (25), the plate body (21) is equipped with pressing plate by fastening bolt (24) (23), limit hole (22) corresponding with the binding hole is offered on the pressing plate (23), the fastening bolt (24) is pair Claim two of setting.
6. the dedicated three holes two-wire punching threading all-in-one machine of archive office as claimed in claim 5, it is characterised in that the engine Structure includes two and is threaded through on the plate body (21) and rotates in same direction and reciprocating screw rod disposed in parallel (6) and be mounted on rack (1) On rotary electric machine (4), the end of reciprocating screw rod (6) is mounted on the rack (1) by bearing block, reciprocating screw rod (6) One end is equipped with worm gear (26), and the worm screw (27) with worm gear (26) cooperation is equipped on the line shaft of rotary electric machine (4), described Rotary electric machine (4) and the switch connect.
7. the dedicated three holes two-wire punching threading all-in-one machine of archive office as described in claim 1, it is characterised in that the rack (1) Lower part fixing seat is installed, shaft is equipped in the fixing seat, one end of shaft is equipped with belt pulley and driving device skin Band connection, the other end of shaft are connected by power with the rotating shuttle (7).
CN201811645111.2A 2018-12-30 2018-12-30 A kind of dedicated three holes two-wire punching threading all-in-one machine of archive office Pending CN109367271A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201811645111.2A CN109367271A (en) 2018-12-30 2018-12-30 A kind of dedicated three holes two-wire punching threading all-in-one machine of archive office

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Application Number Priority Date Filing Date Title
CN201811645111.2A CN109367271A (en) 2018-12-30 2018-12-30 A kind of dedicated three holes two-wire punching threading all-in-one machine of archive office

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CN109367271A true CN109367271A (en) 2019-02-22

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CN113910802A (en) * 2021-09-18 2022-01-11 义乌工商职业技术学院 Financial affairs voucher binding means
CN115246276A (en) * 2022-06-09 2022-10-28 常州机电职业技术学院 Book binding threading device and using method thereof

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CN105538200A (en) * 2016-02-02 2016-05-04 华中科技大学 Tool clamp with workpiece shape protecting function
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CN108237580A (en) * 2016-12-27 2018-07-03 天津市金奥林箱包有限公司 A kind of equipment for processing musical instrument luggage
CN106985567A (en) * 2017-04-27 2017-07-28 庸博(厦门)电气技术有限公司 The installing of paper transfer matic is standby
CN206795243U (en) * 2017-06-07 2017-12-26 马鞍山市恒利达机械刀片有限公司 A kind of equipment with fixed cutting tool punching polishing function
CN206884512U (en) * 2017-06-28 2018-01-16 陈伯睿 A kind of binder clamping plate
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CN206912736U (en) * 2017-07-10 2018-01-23 吴保霞 A kind of sheet metal puncher
CN107776228A (en) * 2017-10-31 2018-03-09 张华� A kind of traditional thread binding formula drilling binder of self-threading
CN107687667A (en) * 2017-11-14 2018-02-13 赵璐 A kind of radiator installation auxiliary device
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* Cited by examiner, † Cited by third party
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CN113910802A (en) * 2021-09-18 2022-01-11 义乌工商职业技术学院 Financial affairs voucher binding means
CN113910802B (en) * 2021-09-18 2022-11-08 义乌工商职业技术学院 Financial affairs voucher binding means
CN115246276A (en) * 2022-06-09 2022-10-28 常州机电职业技术学院 Book binding threading device and using method thereof

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