Automatic paper pressing structure of a bookbinding machine

Abstract

The present disclosure provides a bookbinding machine automatic paper pressing plate structure, comprising a paper pressing plate table, a paper pressing plate, a first lifting screw rod, a second lifting screw rod and an electric driver, the paper pressing plate is located on the upper side of the paper pressing plate table, and the lower side of the paper pressing plate is parallel to the upper side of the paper pressing plate table, the first lifting screw rod and the second lifting screw rod driven by the electric driver are arranged on the two sides of the paper pressing plate table, the interval area of the paper pressing plate table between the first lifting screw rod and the second lifting screw rod forms a paper pressing area, and the front and back sides of the mouth-shaped structure composed of the paper pressing plate, the first lifting screw rod, the second lifting screw rod and the paper pressing plate table are communicated, and the bookbinding machine automatic paper pressing plate structure can realize more flat paper pressing effect and convenient position adjustment.

Description

Technical Field

[0001] This utility model relates to the field of binding machine technology, specifically to an automatic cardboard pressing structure for a binding machine. Background Technology

[0002] The main function of a binding machine is to punch holes in documents that need to be bound, and then use rivet tubes to bind them. Because it is used more by financial personnel, for example, when they need to bind financial documents, the binding machine can also be called a financial binding machine. However, it is not limited to use by financial personnel; it can also be used in other scenarios where binding is required.

[0003] Before punching holes, the binding machine needs to fix the materials to be bound in place. This ensures more precise hole placement during punching, which is beneficial for binding. However, the existing binding machine's pressing plate structure needs improvement, such as how to facilitate automatic paper pressing. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the defects of the prior art and propose an automatic paper pressing structure for a binding machine, which is conducive to realizing automatic paper pressing.

[0005] Compared with the prior art, this utility model proposes an automatic pressing board structure for a binding machine, which also includes a pressing board, a lifting screw, and an electric driver; the pressing board forms a pressing interval between itself and the pressing board table; the lifting screw is rotatably fixed on the pressing board table and extends towards the pressing board and connects to it, and rotating the lifting screw can realize the lifting and lowering of the pressing board relative to the pressing board table; the electric driver includes a motor and a transmission mechanism disposed on the lifting screw, which transmits the power of the motor to the lifting screw, thereby driving the pressing board to lift and lower in the pressing interval area.

[0006] In some embodiments, a self-locking mechanism is also included, which is disposed on the lifting screw and / or the transmission mechanism.

[0007] In some embodiments, the lifting screw includes a first lifting screw and a second lifting screw. The pressure plate is located on the upper side of the pressure plate platform, and the lower side of the pressure plate is parallel to the upper side of the pressure plate platform. The first lifting screw and the second lifting screw are respectively provided on both sides of the pressure plate platform. The first lifting screw and the second lifting screw extend vertically upward from the pressure plate platform and are threadedly connected to the pressure plate. The first lifting screw and the second lifting screw are respectively connected to an electric driver via a transmission mechanism. The electric driver is used to drive the first lifting screw and the second lifting screw to rotate synchronously in the forward direction / synchronously in the reverse direction. When the first lifting screw and the second lifting screw rotate synchronously in the forward direction, they drive the pressure plate to descend by being threadedly connected to the pressure plate. When the first lifting screw and the second lifting screw rotate synchronously in the reverse direction, they drive the pressure plate to rise by being threadedly connected to the pressure plate. The space between the first lifting screw and the second lifting screw on the pressure plate platform forms a pressure area, and the pressure plate is directly above the pressure area.

[0008] In some embodiments, the electric actuator includes a first drive motor and a second drive motor. The first drive motor and the second drive motor are respectively arranged on both sides of the pressure plate table. The first drive motor is connected to the first lifting screw via a transmission mechanism, and the second drive motor is connected to the second lifting screw via a transmission mechanism. The first drive motor and the second drive motor rotate synchronously to drive the first lifting screw and the second lifting screw to rotate synchronously in the forward direction or synchronously in the reverse direction.

[0009] In some embodiments, the lower side of the pressure plate table is provided with a mounting cavity corresponding to the first lifting screw and the second lifting screw. A first drive motor is connected to a first worm gear. The lower end of the first lifting screw is inserted into the mounting cavity and is provided with a first worm wheel. The first worm gear and the first worm wheel are in a transmission engagement. A second drive motor is connected to a second worm gear. The lower end of the second lifting screw is inserted into the mounting cavity and is provided with a second worm wheel. The second worm gear and the second worm wheel are in a transmission engagement.

[0010] In some embodiments, the first worm gear and the second worm gear each include a cylinder and circumferential teeth arranged around the cylinder. An upper annular groove and a lower annular groove distributed on the upper and lower sides are respectively provided between the circumferential teeth and the cylinder. A first bearing is provided in the upper annular groove and a second bearing is provided in the lower annular groove. The cylinder is rotatably supported by the first bearing and the second bearing.

[0011] In some embodiments, the cylinder is provided with a polygonal hole, and the lower ends of the first lifting screw and the second lifting screw are both provided with polygonal posts that fit into the polygonal hole.

[0012] In some embodiments, the system further includes a first column corresponding to the first lifting screw and a second column corresponding to the second lifting screw. The lower ends of the first column and the second column are fixedly mounted on the pressing plate table. The upper ends of the first column and the second column are each provided with a third bearing. The upper ends of the first lifting screw and the second lifting screw are each connected to their respective third bearings. The third bearings are used to rotatably support the upper ends of the first lifting screw and the second lifting screw. The opposing sides of the first column and the second column are both open. The lateral width of the opening is greater than the lateral width of the pressing plate. The two ends of the pressing plate move up and down through the opening.

[0013] In some embodiments, the inner side of the first column and / or the inner side of the second column protrudes inward from their respective lifting screws, and the inner side of the first column and / or the inner side of the second column serves as the side of the binding material against the grid.

[0014] In some embodiments, the two sides of the lateral distribution of the opening serve as side gates.

[0015] In some embodiments, the upper ends of the first column and the second column are provided with two opposing protrusions, which form an inverted L-shaped structure with the corresponding support. The lower surfaces of the two protrusions can serve as the upper limiting surfaces of the pressure plate.

[0016] In some embodiments, the pressing board is made of a transparent material plate, through which the position and flatness of the bound material can be observed.

[0017] Compared with the prior art, the present invention has the following advantages when adopting the above structure: The technical solution disclosed herein also includes a pressing plate, a lifting screw, and an electric driver; the pressing plate forms a pressing interval between the pressing plate and the pressing plate table; the lifting screw is rotatably fixed on the pressing plate table and extends to one side of the pressing plate and connects to the pressing plate, and rotating the lifting screw can realize the lifting and lowering of the pressing plate relative to the pressing plate table; the electric driver includes a motor and a transmission mechanism provided on the lifting screw, which transmits the power of the motor to the lifting screw, thereby driving the pressing plate to realize the lifting and lowering of the pressing plate in the pressing interval area. Therefore, pressing the paper by electric means is beneficial to realize automatic paper pressing. Attached Figure Description

[0018] Figure 1 This is a three-dimensional schematic diagram of an automatic cardboard pressing structure for a binding machine.

[0019] Figure 2 This is a three-dimensional schematic diagram of an automatic cardboard pressing structure for a binding machine from a lower perspective.

[0020] Figure 3 This is a three-dimensional schematic diagram of an automatic cardboard pressing structure for a binding machine, showing the worm gear engagement from a lower perspective.

[0021] Figure 4 This is a three-dimensional schematic diagram of the lifting structure on one side of the first lifting screw.

[0022] Figure 5 This is a three-dimensional schematic diagram of a lifting nut.

[0023] Figure 6 This is a top view of an automatic cardboard pressing structure for a binding machine.

[0024] Figure 7 This is a sectional view along axis AA.

[0025] Figure 8 This is a three-dimensional schematic diagram of a lifting nut.

[0026] Explanation of reference numerals in the attached drawings: 1-Plate pressing platform, 2-Plate pressing board, 3-First lifting screw, 4-Second lifting screw, 5-Electric driver, 6-Lifting nut, 7-Plate pressing area, 8-U-shaped structure, 9-First drive motor, 10-Second drive motor, 11-Mounting cavity, 12-First worm gear, 13-First worm wheel, 14-Cylinder, 15-Circumferential teeth, 16-First bearing, 17-Second bearing, 18-Polygonal hole, 19-Polygonal column, 20-First column, 21-Second column, 22-Third bearing, 23-Side rail, 24-Opening, 25-Protrusion, 26-Electrical connection plug. Detailed Implementation

[0027] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The embodiments described below are merely examples, and other obvious variations will arise for those skilled in the art. The basic principles of the present invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0028] Those skilled in the art should understand that, in the disclosure of this utility model, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations on this utility model.

[0029] This invention discloses an automatic pressing board structure for a binding machine, including a pressing board platform 1, a pressing board 2, a lifting screw, and an electric driver 5; the pressing board 2 forms a pressing interval with the pressing board platform 1; the lifting screw is rotatably fixed on the pressing board platform 1 and extends to one side of the pressing board 2 and connects to the pressing board 2, rotating the lifting screw can realize the lifting and lowering of the pressing board 2 relative to the pressing board platform 1; the electric driver 5 includes a motor and a transmission mechanism disposed on the lifting screw, the transmission mechanism transmits the power of the motor to the lifting screw, thereby driving the pressing board 2 to realize the lifting and lowering of the pressing board in the pressing interval area.

[0030] The lifting screw can be one screw, or two screws or more.

[0031] The transmission mechanism can be a worm gear transmission mechanism, a gear transmission mechanism, a rack and pinion transmission mechanism, etc.

[0032] In some embodiments, a self-locking mechanism is also included, which is disposed in the lifting screw and / or the transmission mechanism. For example, the screw pair of the lifting screw is a self-locking screw pair, and the transmission mechanism is a self-locking worm gear transmission mechanism. In this way, the binding material can be effectively pressed down by self-locking, thereby reliably positioning the binding material, especially when drilling holes in the binding material, the binding material is less likely to rebound when subjected to drilling force.

[0033] like Figures 1 to 8 As shown, an automatic pressing board structure for a binding machine is disclosed, including a pressing board platform 1, a pressing board 2, a first lifting screw 3, a second lifting screw 4, and an electric driver 5. The pressing board 2 is located on the upper side of the pressing board platform 1, and the lower side of the pressing board 2 is parallel to the upper side of the pressing board platform 1. The first lifting screw 3 and the second lifting screw 4 are respectively arranged on both sides of the pressing board platform 1. The first lifting screw 3 and the second lifting screw 4 extend vertically upward from the pressing board platform 1 and are threadedly connected to the pressing board 2. The first lifting screw 3 and the second lifting screw 4 are respectively connected to the electric driver 5 through a transmission mechanism. The electric driver 5 is used to drive the first lifting screw 3 and the second lifting screw 4 to rotate synchronously in the forward direction and synchronously in the reverse direction. When rotating synchronously in the forward direction, the first lifting screw 3 and the second lifting screw 4 drive the pressing board 2 to descend by being threadedly connected to the pressing board 2. When rotating synchronously in the reverse direction, the first lifting screw 3 and the second lifting screw 4 drive the pressing board 2 to rise by being threadedly connected to the pressing board 2.

[0034] In this way, on the one hand, a flatter paper pressing effect can be achieved, and the first lifting screw 3 and the second lifting screw 4 have a greater pressing force, which is conducive to better pressing and fixing the bound material. On the other hand, the front and back sides of the U-shaped structure formed by the pressing board 2, the first lifting screw 3, the second lifting screw 4, and the pressing board platform 1 are connected. So when the bound material is placed in the paper pressing area, the pressing board 2 can descend to press the bound material, and the connection can be used to adjust the front and back position of the bound material inserted into the U-shaped structure, which is conducive to the convenience of adjusting the position of the bound material.

[0035] The first lifting screw 3 and the second lifting screw 4 extend vertically upward from the pressure plate table 1 and are threadedly connected to the pressure plate 2. They can be connected by internal threads on the pressure plate 2, or by lifting nuts 6 on the pressure plate 2. Figure 5 , 7 As shown, the lifting nut 6 has an internal thread and is sleeved and fixed on the pressure plate 2.

[0036] The space between the first lifting screw 3 and the second lifting screw 4 on the pressure plate platform 1 forms the pressure area 7. The pressure plate 2 is directly above the pressure area 7. The front and rear sides of the U-shaped structure 8 formed by the pressure plate 2, the first lifting screw 3, the second lifting screw 4, and the pressure plate platform 1 are connected. When the binding material is placed in the pressure area 7, the pressure plate 2 descends to press down the binding material. The connection allows for adjustment of the front and rear position of the binding material inserted into the U-shaped structure 8.

[0037] The electric actuator 5 can be a dual-output drive motor, sharing a single shaft. However, due to the relatively long pressing plate 2, resulting in a large gap between the first lifting screw 3 and the second lifting screw 4, in this example, the electric actuator 5 includes a first drive motor 9 and a second drive motor 10. The first drive motor 9 and the second drive motor 10 are respectively installed on both sides of the pressing plate table 1. The first drive motor 9 is connected to the first lifting screw 3, and the second drive motor 10 is connected to the second lifting screw 4. The first drive motor 9 and the second drive motor 10 rotate synchronously to drive the first lifting screw 3 and the second lifting screw 4 to rotate synchronously in the forward direction or synchronously in the reverse direction. For example, if the first drive motor 9 and the second drive motor 10 are stepper motors with encoders, the rotational synchronization of the first drive motor 9 and the second drive motor 10 can be controlled more precisely, thereby achieving better lifting / lowering of the pressing plate 2.

[0038] like Figure 1 As shown, the pressure plate table 1 is also equipped with an electrical connection plug 26, so as to electrically control the first drive motor 9 and the second drive motor 10.

[0039] In some embodiments, such as Figure 2 , 3 As shown, the lower side of the pressure plate table 1 has mounting cavities 11 corresponding to the positions of the first lifting screw 3 and the second lifting screw 4. The first drive motor 9 is connected to the first worm gear 12. The lower end of the first lifting screw 3 is inserted into the mounting cavity 11 and is equipped with a first worm wheel 13. The first worm gear 12 and the first worm wheel 13 are in a transmission engagement. The second drive motor 10 is connected to the second worm gear. The lower end of the second lifting screw 4 is inserted into the mounting cavity 11 and is equipped with a second worm wheel. The second worm gear and the second worm wheel are in a transmission engagement. In this way, the transmission force is large and the precision is high. More importantly, it also has a self-locking function, which helps the pressure plate 2 to descend reliably press down on the bound material and prevents it from being loosened by the bound material.

[0040] Among them, such as Figure 7 As shown, the first driving structure consisting of the first lifting screw 3, the first worm gear 13, and the first worm 12 is symmetrically arranged with the second driving structure consisting of the second lifting screw 4, the second worm gear, and the second worm.

[0041] In some embodiments, such as Figure 7 As shown, both the first worm gear 13 and the second worm gear include a cylinder 14 and circumferentially arranged teeth 15 surrounding the cylinder 14. An upper annular groove and a lower annular groove are respectively provided between the circumferential teeth 15 and the cylinder 14. A first bearing 16 is provided in the upper annular groove, and a second bearing 17 is provided in the lower annular groove. The cylinder 14 is rotatably supported by the first bearing 16 and the second bearing 17. This design results in a compact structure with a small axial thickness, improves rotational stability, and helps maintain axial stability under the support of the first bearing 16 and the second bearing 17, preventing the lifting screw from easily swaying laterally.

[0042] In some embodiments, such as Figure 3 As shown, the cylinder 14 is provided with a polygonal hole 18, and the lower ends of the first lifting screw 3 and the second lifting screw 4 are both provided with polygonal posts 19 that fit into the polygonal hole 18. In this way, the transmission force is large and slippage is not easy to occur.

[0043] like Figure 3 As shown, polygonal hole 18 is, for example, a regular hexagonal hole.

[0044] In some embodiments, such as Figure 1 , 7As shown, it also includes a first column 20 corresponding to the first lifting screw 3 and a second column 21 corresponding to the second lifting screw 4. The lower ends of the first column 20 and the second column 21 are both fixedly mounted on the pressure plate table 1. The upper ends of the first column 20 and the second column 21 are each provided with a third bearing 22. The upper ends of the first lifting screw 3 and the second lifting screw 4 are connected to their respective third bearings 22. The third bearings 22 are used to rotatably support the upper ends of the first lifting screw 3 and the second lifting screw 4. In this way, the first lifting screw 3 and the second lifting screw 4 are better supported, and the first lifting screw 3 and the second lifting screw 4 are less likely to swing laterally.

[0045] In some embodiments, such as Figure 1 , 7 As shown in Figure 8, the inner side of the first column 20 and / or the inner side of the second column 21 protrudes inward above their respective lifting screws, serving as the side abutments 23 for the bound material. This facilitates the user's alignment of the bound material's sides, making it more convenient for the user to use.

[0046] In some embodiments, such as Figure 1 , 8 As shown, the sides of the first column 20 and the second column 21 facing each other are provided with openings 24. The lateral width of the opening 24 is greater than the lateral width of the pressure plate 2. Both ends of the pressure plate 2 are inserted into the opening 24 and connected to the corresponding screws. The two ends of the pressure plate 2 move up and down through the opening 24. At least one of the two sides of the two openings 24 facing each other serves as a side rail 23.

[0047] like Figure 8 As shown, the opening 24 is U-shaped, so that the two sides of the opening 24 are respectively vertically arranged two sides, that is, the two sides of the opening 24 are distributed horizontally, and these two sides serve as side gates 23.

[0048] In some embodiments, such as Figure 1 , 7 As shown in Figure 8, the upper ends of the first column 20 and the second column 21 are provided with two opposing protrusions 25. These protrusions 25 form an inverted L-shaped structure with the corresponding supports, and the lower sides of the two protrusions 25 can serve as the upper limiting surfaces of the pressure plate 2. In this way, an additional mechanical limiting is provided.

[0049] In some embodiments, such as Figure 1 As shown, the pressing board 2 is made of a transparent material, allowing the user to observe the position and flatness of the pressed material. This makes it more convenient for the user. The transparent material can be, for example, an acrylic sheet.

[0050] When understanding this disclosure, the above structure may be referred to other embodiments / appendices if necessary. Figure 1 And that's understood, so I won't go into details here.

[0051] The above description is merely an illustrative embodiment of this utility model. Therefore, all equivalent changes or modifications made to the structure, features, and principles described in the scope of protection of this utility model are included within the scope of protection of this utility model.

Claims

1. An automatic paperboard pressing structure for a binding machine, comprising a paperboard pressing table (1), characterized in that, It also includes a pressure plate (2), a lifting screw and an electric drive (5); Pressing plate (2), a pressing interval is formed between pressing plate (2) and pressing plate table (1); The lifting screw is rotatably fixed on the pressing board table (1) and extends to the pressing board (2) side and is connected to the pressing board (2). Rotating the lifting screw can realize the lifting of the pressing board (2) relative to the pressing board table (1); The electric drive (5) includes a motor and a transmission mechanism located on the lifting screw. The transmission mechanism transmits the power of the motor to the lifting screw, thereby driving the pressing paperboard (2) to lift and lower in the pressing paper interval area.

2. The automatic cardboard pressing structure of the binding machine as described in claim 1, characterized in that, It also includes a self-locking mechanism, which is located on the lifting screw and / or the transmission mechanism.

3. The automatic cardboard pressing structure of the binding machine as described in claim 1 or 2, characterized in that, The lifting screws include a first lifting screw (3) and a second lifting screw (4). The pressure plate (2) is located on the upper side of the pressure plate table (1), and the lower side of the pressure plate (2) is parallel to the upper side of the pressure plate table (1). The first lifting screw (3) and the second lifting screw (4) are respectively provided on both sides of the pressure plate table (1). The first lifting screw (3) and the second lifting screw (4) extend vertically upward from the pressure plate table (1) and are threadedly connected to the pressure plate (2). 4) They are respectively connected to the electric drive (5) via a transmission mechanism. The electric drive (5) is used to drive the first lifting screw (3) and the second lifting screw (4) to rotate synchronously in the forward direction / in the reverse direction. When the first lifting screw (3) and the second lifting screw (4) rotate synchronously in the forward direction, they drive the pressure plate (2) to descend by being threadedly connected to the pressure plate (2). When the first lifting screw (3) and the second lifting screw (4) rotate synchronously in the reverse direction, they drive the pressure plate (2) to rise by being threadedly connected to the pressure plate (2). The space between the first lifting screw (3) and the second lifting screw (4) of the pressing plate table (1) forms the pressing area (7), and the pressing plate (2) is directly above the pressing area (7).

4. The automatic cardboard pressing structure of the binding machine as described in claim 3, characterized in that, The electric drive (5) includes a first drive motor (9) and a second drive motor (10). The first drive motor (9) and the second drive motor (10) are respectively arranged on both sides of the pressure plate table (1). The first drive motor (9) is connected to the first lifting screw (3) through a transmission mechanism. The second drive motor (10) is connected to the second lifting screw (4) through a transmission mechanism. The first drive motor (9) and the second drive motor (10) rotate synchronously to drive the first lifting screw (3) and the second lifting screw (4) to rotate synchronously in the forward direction / synchronously in the reverse direction.

5. The automatic cardboard pressing structure of the binding machine as described in claim 4, characterized in that, The lower side of the pressure plate table (1) is provided with a mounting cavity (11) corresponding to the first lifting screw (3) and the second lifting screw (4). The first drive motor (9) is connected to the first lifting screw (3) via a worm gear transmission. The lower end of the first lifting screw (3) is inserted into the mounting cavity (11) and is provided with a first worm gear (13). The first worm (12) and the first worm gear (13) are driven together. The second drive motor (10) is connected to a second worm. The lower end of the second lifting screw (4) is inserted into the mounting cavity (11) and is provided with a second worm gear. The second worm and the second worm gear are driven together.

6. The automatic cardboard pressing structure of the binding machine as described in claim 5, characterized in that, Both the first worm gear (13) and the second worm gear include a cylinder (14) and circumferential teeth (15) arranged around the cylinder (14). The circumferential teeth (15) and the cylinder (14) are respectively provided with an upper annular groove and a lower annular groove distributed on the upper and lower sides. The upper annular groove is provided with a first bearing (16) and the lower annular groove is provided with a second bearing (17). The cylinder (14) is rotatably supported by the first bearing (16) and the second bearing (17).

7. The automatic cardboard pressing structure of the binding machine as described in claim 6, characterized in that, The cylinder (14) is provided with a polygonal hole (18), and the lower ends of the first lifting screw (3) and the second lifting screw (4) are provided with polygonal columns (19) that fit into the polygonal hole (18).

8. The automatic cardboard pressing structure of the binding machine as described in claim 3, characterized in that, It also includes a first column (20) corresponding to the first lifting screw (3) and a second column (21) corresponding to the second lifting screw (4). The lower ends of the first column (20) and the second column (21) are fixedly mounted on the pressing board table (1). The upper ends of the first column (20) and the second column (21) are provided with third bearings (22). The upper ends of the first lifting screw (3) and the second lifting screw (4) are connected to their respective third bearings (22). The third bearings (22) are used to rotate and support the upper ends of the first lifting screw (3) and the second lifting screw (4). The sides of the first column (20) and the second column (21) facing each other are provided with openings (24). The two ends of the pressing board (2) move up and down through the openings (24).

9. The automatic cardboard pressing structure of the binding machine as described in claim 8, characterized in that, The inner side of the first column (20) and / or the inner side of the second column (21) extend inward beyond their respective lifting screws, and the inner side of the first column (20) and / or the inner side of the second column (21) serve as the side of the binding material against the grid (23).

10. The automatic cardboard pressing structure of the binding machine as described in claim 8, characterized in that, The opening (24) is set in a U-shape, and the two sides of the opening (24) are laterally distributed as side gates (23).

11. The automatic cardboard pressing structure of the binding machine as described in claim 8, characterized in that, The upper end of the first column (20) and the upper end of the second column (21) are provided with two protrusions (25) facing each other. The protrusions (25) and the corresponding supports form an inverted L-shaped structure. The lower side of the two protrusions (25) can be used as the upper limiting surface of the pressure plate (2).

12. The automatic cardboard pressing structure of the binding machine as described in claim 1 or 2, characterized in that, The pressing board (2) uses a transparent material board, through which the position and flatness of the bound material can be observed.

Images