Paper roll clamping device applied to blueprint machine

Abstract

The utility model relates to a paper roll clamping device applied to a blueprint machine. The paper roll clamping device comprises a bottom plate, paired clamping plates, a synchronous centering assembly and a conical head assembly. The synchronous centering assembly comprises paired synchronous racks and a centering gear located between the two synchronous racks, and the centering gear is meshed with the two synchronous racks. The conical head assembly comprises a conical head and a clamping jaw; the side face of the conical head comprises a guide face and a mounting face which are connected with each other, the guide face has a certain taper, the conical head assembly is provided with a plurality of clamping spaces which are concavely arranged on the mounting face, clamping jaws and first elastic parts are arranged in the clamping spaces, and second ends of the clamping jaws can extend out of the clamping spaces under the action of elasticity of the first elastic parts. The two synchronous racks are arranged, the centering gear meshed with the two synchronous racks is arranged between the two synchronous racks, it is guaranteed that the two synchronous racks can synchronously move in the opposite directions at the same time, and then it is guaranteed that the two conical heads can clamp paper rolls with different widths.

Description

Technical Field

[0001] The utility model relates to the field of printing, in particular to a paper roll clamping device applied to a blueprint machine. Background Art

[0002] In the field of existing continuous printer technology, as one of the important consumables, the stable and smooth paper feeding and paper discharging mechanisms of paper rolls are directly related to the printing efficiency of printers and the user experience. When installing a paper roll, generally, a tapered tooling is inserted into the end of the paper roll respectively from both ends, and the two tapered toolings are used to clamp the paper roll. However, since the paper roll needs to be installed in the middle of the printer, in order to ensure that the paper roll is fixed at the accurate position, the existing paper roll fixing device can only fix a paper roll with one width and cannot fix paper rolls with different widths. Moreover, the tapered tooling is prone to relative sliding with the paper roll. Summary of the Utility Model

[0003] (1) Technical Problems to be Solved

[0004] The utility model provides a paper roll clamping device applied to a blueprint machine, aiming to solve the problems that the existing paper roll fixing device cannot fix paper rolls with different widths and the paper roll is prone to sliding with the paper roll fixing device.

[0005] (2) Technical Solutions

[0006] To solve the above problems, the utility model provides a paper roll clamping device applied to a blueprint machine, and the paper roll clamping device includes: a bottom plate, a pair of clamping plates, a synchronous centering assembly and a taper head assembly;

[0007] The clamping plates are slidably arranged on the bottom plate, and the taper head assemblies are rotatably arranged on the first side surfaces of the clamping plates. The taper head assemblies on the two clamping plates are arranged oppositely, and the two taper head assemblies are used for installing a paper roll;

[0008] The synchronous centering assembly includes a pair of synchronous racks and a centering gear located between the two synchronous racks. The centering gear meshes with the two synchronous racks; the centering gear is rotatably installed on the bottom plate. The synchronous racks correspond to the clamping plates one by one, and the synchronous racks are fixedly connected with the clamping plates;

[0009] The cone head assembly includes: a cone head and a clamping jaw; one end face of the cone head is rotatably installed on the clamping plate; the side surface of the cone head includes a guiding surface and an installation surface that are connected to each other, the guiding surface has a certain taper, a plurality of clamping spaces are recessed inward on the installation surface of the cone head assembly, a clamping jaw and a first elastic member are arranged in the clamping space, the first end of the clamping jaw is hinged in the clamping space, one end of the first elastic member abuts against the second end of the clamping jaw, the other end of the first elastic member abuts against the cone head assembly, and the second end of the clamping jaw can extend out of the clamping space under the action of the elastic force of the first elastic member.

[0010] Preferably, the cone head includes a first mounting post and a second mounting post that are connected to each other, the diameter of the first mounting post is smaller than that of the second mounting post, a plurality of guiding ribs connected to the second mounting post are annularly arranged on the circumferential surface of the first mounting post, and the end face of the guiding rib away from the circumferential surface of the first mounting post is configured as the guiding surface; the circumferential surface of the second mounting post is configured as the installation surface.

[0011] Preferably, a baffle is fixedly arranged on the end face of one end of the second mounting post, and the baffle is rotatably installed on the bottom plate.

[0012] Preferably, the paper roll clamping device further includes a support shaft;

[0013] A first bearing and a shaft sleeve are sleeved on the support shaft, a through hole is penetrated through the cone head, and the cone head is fixed on the outer ring of the first bearing through the through hole;

[0014] A second bearing is arranged on the shaft sleeve, and the shaft sleeve is rotatably installed on the clamping plate through the second bearing; a power wheel is fixedly arranged on the shaft sleeve, and the shaft sleeve is fixedly connected to the cone head, and the shaft sleeve can drive the cone head to rotate.

[0015] Preferably, a guiding support inclined block is arranged at one end of the support shaft close to the cone head.

[0016] Preferably, the paper roll clamping device further includes a driving assembly, and the driving assembly includes: a transmission guide rail, a synchronous pulley, and a synchronous belt;

[0017] The transmission guide rail is rotatably installed on the bottom plate, synchronous pulleys are rotatably arranged on the second side surfaces of the clamping plates, and the synchronous pulleys and the power wheel are connected by the synchronous belt;

[0018] The synchronous pulley is sleeved on the transmission guide rail, the synchronous pulley can slide along the transmission guide rail, and the transmission guide rail can drive the synchronous pulley to rotate.

[0019] Preferably, the driving assembly further includes a tensioning bracket and a tensioning wheel;

[0020] The tensioning bracket is hinged on the second side of the clamping plate. One end of the tensioning bracket is rotatably provided with the tensioning wheel. The side surface of the tensioning wheel can be in contact with the synchronous belt. An arc-shaped fixing groove is provided at the other end of the tensioning bracket. The hinge point between the tensioning bracket and the clamping plate is located between the two ends of the tensioning bracket.

[0021] Preferably, the paper roll clamping device further includes a locking assembly, and the locking assembly includes a locking rack, a stop swing arm, a second elastic member, and a stop block;

[0022] The locking rack is fixedly arranged on the bottom plate. The stop swing arm is rotatably installed on the clamping plate, and a stop tooth capable of meshing with the locking rack is arranged on the stop swing arm;

[0023] One end of the second elastic member is fixedly connected to the stop swing arm, and the other end of the second elastic member is fixedly installed on the clamping plate;

[0024] The stop block is slidably installed on the clamping plate. When the stop block slides on the clamping plate, the stop block can push the stop tooth on the stop swing arm to mesh with the locking rack.

[0025] Preferably, the locking assembly further includes a locking handle and a limit card plate;

[0026] The locking handle is rotatably installed on the clamping plate. One end of the locking handle is provided with a waist-shaped hole, and a connecting rod is arranged in the waist-shaped hole. The connecting rod is fixedly connected to the stop block. Rotating the other end of the locking handle can drive the stop block to slide on the clamping plate;

[0027] The limit card plate is fixedly arranged on the clamping plate. The limit card plate is provided with a limit protrusion. A locking groove is arranged on one side of the locking handle facing the limit card plate. When the locking handle drives the stop tooth on the stop swing arm to mesh with the locking rack through the stop block, the limit protrusion can be clamped in the locking groove.

[0028] (III) Beneficial effects

[0029] By providing two synchronous racks and a centering gear meshing therebetween, the present utility model ensures that the two synchronous racks can move synchronously in opposite directions at the same time, thereby ensuring that the two conical heads can clamp paper rolls of different widths. In addition, claws are provided on the conical heads to contact the inner wall of the paper roll, increasing the friction between the conical heads and the paper roll, avoiding relative sliding between the paper roll and the conical heads, and ensuring the normal progress of printing. Brief Description of the Drawings

[0030] Figure 1 Fig. is a schematic structural view of the paper roll clamping device of the present utility model;

[0031] Figure 2 Fig. is a schematic structural view of the paper roll clamping device of the present utility model from another perspective;

[0032] Figure 3 is Figure 2 an enlarged view at A;

[0033] Figure 4 Fig. is an exploded view of the cone head assembly, support shaft and drive assembly on the bottom plate in the present utility model;

[0034] Figure 5 is Figure 4 an enlarged view at B.

[0035]

Description of the Reference Numerals

[0036] 1: Bottom plate;

[0037] 2: Clamping plate;

[0038] 3: Synchronous centering assembly; 31: Synchronous rack; 32: Centering gear;

[0039] 4: Cone head assembly; 41: Cone head; 411: Guide surface; 412: Mounting surface; 413: First mounting post; 414: Second mounting post; 415: Guide rib; 42: Claw; 43: Clamping space; 44: First elastic member; 45: Baffle;

[0040] 5: Support shaft; 51: First bearing; 52: Sleeve; 53: Second bearing; 54: Driving wheel; 55: Guide support inclined block;

[0041] 6: Drive assembly; 61: Transmission guide rail; 62: Synchronous pulley; 63: Synchronous belt; 64: Tensioning bracket; 641: Arc-shaped fixing groove; 65: Tensioning wheel;

[0042] 7: Locking assembly; 71: Locking rack; 72: Stop swing arm; 73: Second elastic member; 74: Stop block; 75: Locking handle; 751: Waist-shaped hole; 752: Link; 753: Locking groove; 76: Limit clamping plate; 761: Limit protrusion. Detailed Embodiment

[0043] In order to better explain the present utility model for easy understanding, the present utility model will be described in detail below with reference to the drawings through specific embodiments.

[0044] It should be noted that all the directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model are only used to explain the relative positional relationship and movement conditions between components in a certain specific posture (as shown in the attached drawings). If the specific posture changes, the directional indications will also change accordingly.

[0045] In addition, in the present utility model, descriptions such as "first" and "second" are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0046] In the present utility model, unless otherwise clearly specified and limited, terms such as "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0047] The present utility model provides a paper roll clamping device applied to a blueprint machine. The paper roll clamping device includes: a bottom plate 1, a pair of clamping plates 2, a synchronous centering assembly 3, and a taper head assembly 4. The clamping plates 2 are slidably arranged on the bottom plate 1. Taper head assemblies 4 are rotatably arranged on the first side surfaces of the clamping plates 2. The taper head assemblies 4 on the two clamping plates 2 are arranged oppositely, and the two taper head assemblies 4 are used for installing a paper roll; generally, a through hole is arranged along the axis of the paper roll, and the two taper head assemblies 4 are inserted into both ends of the through hole to realize the installation of the paper roll.

[0048] The synchronous centering assembly 3 includes a pair of synchronous racks 31 and a centering gear 32 located between the two synchronous racks 31. The centering gear 32 meshes with the two synchronous racks 31; the centering gear 32 is rotatably installed on the bottom plate 1. The synchronous racks 31 correspond to the clamping plates 2 one by one, and the synchronous racks 31 are fixedly connected to the clamping plates 2;

[0049] The cone head assembly 4 includes: a cone head 41 and a claw 42; the end face of one end of the cone head 41 is rotatably mounted on the clamping plate 2; the side surface of the cone head 41 includes a guiding surface 411 and a mounting surface 412 which are connected to each other. The guiding surface 411 has a certain taper. The cone head assembly 4 is recessed inwardly on the mounting surface 412 to form a plurality of clamping spaces 43. A claw 42 and a first elastic member 44 are arranged in the clamping space 43. The first end of the claw 42 is hinged in the clamping space 43. One end of the first elastic member 44 abuts against the second end of the claw 42, and the other end of the first elastic member 44 abuts against the cone head assembly 4. The second end of the claw 42 can protrude out of the clamping space 43 under the action of the elastic force of the first elastic member 44. Specifically, a plurality of teeth are protruded at the second end of the claw 42. The second end of the claw 42 is provided with an inclined surface, and the inclined surface is connected to the top end of the claw 42. In the above solution, a plurality of teeth for abutting against the inner wall of the through hole on the paper roll are arranged at the second end of the claw 42, which can increase the friction force between the claw 42 and the paper tube and reduce the possibility of sliding between the paper tube and the cone head 41. In addition, an inclined surface is arranged at the second end of the claw 42, and the inclined surface at the second end of the claw 42 is connected to the top end of the claw 42, so that the inner wall of the through hole on the paper roll can slide along the guiding surface 411 to the inclined surface at the second end of the claw 42 and finally move to the top end of the teeth, realizing the abutment between the claw 42 and the through hole in the paper tube. That is, the inclined surface arranged at the second end of the claw 42 is used in cooperation with the guiding surface 411 having a taper, which is convenient for installing the paper roll on the cone head 41.

[0050] When paper is wound around the paper tube, it becomes a paper roll. When specifically installing the paper roll, pushing two cone heads 41 or one of the cone heads 41, the clamping plate 2 corresponding to the cone head 41 drives the centering gear 32 to rotate through the synchronous rack 31. The centering gear 32 drives the other synchronous rack 31 to move in the opposite direction, and then drives the corresponding clamping plate 2 to move, and finally realizes that the cone heads 41 on the two clamping plates 2 can move towards each other synchronously (that is, move in opposite directions at the same time). Therefore, the two cone heads 41 can clamp paper rolls of different widths. The inner wall of the through hole in the paper roll can slide along the guiding surface 411 to the mounting surface 412. At this time, the inner wall of the through hole abuts against the second end of the claw 42. At this time, the second end of the claw 42 can abut against the inner wall of the through hole on the paper roll, avoiding the relative sliding between the paper roll and the docking head and ensuring the normal progress of printing. In a preferred embodiment, the first elastic member can be an elastic sleeve or a spring.

[0051] In summary, in the present utility model, by providing two synchronous racks 31 and a centering gear 32 meshing therebetween, it is ensured that the two synchronous racks 31 can move synchronously in opposite directions simultaneously, thereby ensuring that the two taper heads 41 can clamp paper rolls of different widths. In addition, claw 42 is provided on the taper head 41 to abut against the inner wall of the paper roll, increasing the friction force between the taper head 41 and the paper roll, avoiding relative sliding between the paper roll and the taper head 41, and ensuring the normal progress of printing.

[0052] Further, the taper head 41 includes a first mounting post 413 and a second mounting post 414 connected to each other. The diameter of the first mounting post 413 is smaller than that of the second mounting post 414. A plurality of guiding ribs 415 connected to the second mounting post 414 are annularly arranged on the circumferential surface of the first mounting post 413. The end surface of the guiding rib 415 away from the circumferential surface of the first mounting post 413 is configured as a guiding surface 411; the circumferential surface of the second mounting post 414 is configured as a mounting surface 412. The through hole on the paper roll can move along the guiding rib 415 to the mounting surface 412 on the second mounting post 414, and the claw 42 can abut against the inner wall of the paper roll. By providing the guiding rib 415 on the first mounting post 413 and connecting it to the second mounting post 414, the use of materials is saved and the material cost is reduced.

[0053] Furthermore, a baffle 45 is fixedly provided on the end surface of one end of the second mounting post 414, and the baffle 45 is rotatably mounted on the bottom plate 1. The baffle 45 cannot pass through the through hole on the paper roll, which plays a role in limiting the paper roll and ensures that the end surface of the paper roll is always on the taper head 41.

[0054] Specifically, the paper roll clamping device further includes a support shaft 5. A sleeve 52 and a first bearing 51 are sleeved on the support shaft 5. A through hole is provided through the taper head 41, and the taper head 41 is fixed on the outer ring of the first bearing 51 through the through hole. A second bearing 53 is provided on the sleeve 52, and the sleeve 52 is rotatably mounted on the clamping plate 2 through the second bearing 53; a power wheel 54 is fixedly provided on the sleeve 52, and the sleeve 52 is fixedly connected to the taper head 41, and the sleeve 52 can drive the taper head 41 to rotate. The taper head 41 is mounted on the support shaft 5 through the first bearing 51, so that the taper head 41 can rotate on the support shaft 5. When the printer is in use, the paper on the paper roll can extend under the action of an external force, without affecting the normal progress of printing. When it is necessary to retract the paper, the power wheel 54 is driven to drive the sleeve 52 to rotate, the sleeve 52 drives the taper head 41 to rotate, and the rotation of the taper head 41 further brings back the extended paper onto the paper roll to achieve paper retraction.

[0055] In a preferred embodiment, a guiding support inclined block 55 is provided at one end of the supporting shaft 5 close to the conical head 41. When clamping the paper roll, it is only necessary to place the paper roll between the two guiding support inclined blocks 55 on both sides and push the conical heads 41 on both sides towards the middle. Then, the guiding support inclined blocks 55 will automatically extend into the paper roll and lift the paper roll along the inclined surface of the guiding support inclined blocks 55, making the process of installing the paper roll more convenient.

[0056] In addition, the paper roll clamping device further includes a driving assembly 6, and the driving assembly 6 includes: a transmission guide rail 61, a synchronous pulley 62, and a synchronous belt 63. The transmission guide rail 61 is rotatably installed on the bottom plate 1. Synchronous pulleys 62 are rotatably provided on the second side surfaces of the clamping plates 2. The synchronous pulleys 62 and the driving wheel 54 are connected by the synchronous belt 63. The synchronous pulleys 62 are sleeved on the transmission guide rail 61. The synchronous pulleys 62 can slide along the transmission guide rail 61. The transmission guide rail 61 can drive the synchronous pulleys 62 to rotate. The synchronous pulleys 62 can drive through the synchronous belt 63. The synchronous pulleys 62 can only slide with the transmission guide rail 61 and cannot generate relative rotation with the transmission guide rail 61. By using the transmission guide rail 61 to drive the two synchronous pulleys 62 to rotate synchronously, it is realized that the docking heads at both ends of the paper roll can drive the paper roll to rotate synchronously. In a preferred embodiment, the first driving component further includes a driving motor installed on the bottom plate 1, and the driving motor can drive the transmission guide rail 61 to rotate. The driving motor is used to drive the transmission guide rail 61 to rotate.

[0057] Furthermore, the driving assembly 6 further includes a tensioning bracket 64 and a tensioning pulley 65. The tensioning bracket 64 is hinged on the second side surface of the clamping plate 2. A tensioning pulley 65 is rotatably provided at one end of the tensioning bracket 64. The side surface of the tensioning pulley 65 can abut against the synchronous belt 63. An arc-shaped fixing groove 641 is provided at the other end of the tensioning bracket 64. The hinge point of the tensioning bracket 64 and the clamping plate 2 is located between the two ends of the tensioning bracket 64.

[0058] By rotatably providing the tensioning pulley 65 on the tensioning bracket 64 and hinging the tensioning bracket 64 on the clamping support plate, the tensioning bracket 64 can drive the tensioning pulley 65 to swing, and the tensioning pulley 65 can make the synchronous belt 63 more compact on the synchronous pulleys 62 and the driving wheel 54, so that the synchronous pulleys 62 and the driving wheel 54 can rotate synchronously under the drive of the synchronous belt 63.

[0059] On the other hand, the paper roll clamping device further includes a locking assembly 7, and the locking assembly 7 includes a locking rack 71, a stop swing arm 72, a second elastic member 73, and a stop block 74. The locking rack 71 is fixedly arranged on the bottom plate 1, the stop swing arm 72 is rotatably installed on the clamping plate 2, and a stop tooth capable of meshing with the locking rack 71 is arranged on the stop swing arm 72; one end of the second elastic member 73 is fixedly connected to the stop swing arm 72, and the other end of the second elastic member 73 is fixedly installed on the clamping plate 2; when the conical head 41 on the clamping plate 2 does not clamp the paper roll, the second elastic member 73 can pull the brake swing to the first working position. At this time, the stop tooth on the stop swing arm 72 does not mesh with the locking rack 71, and at this time, the clamping plate 2 can slide normally on the bottom plate 1. The stop block 74 is slidably installed on the clamping plate 2, and when the stop block 74 slides on the clamping plate 2, the stop block 74 can push the stop tooth on the stop swing arm 72 to mesh with the locking rack 71. After the conical head 41 on the clamping plate 2 clamps the paper roll, the stop block 74 is pushed to make the stop swing arm 72 swing, so that the stop swing arm 72 is in the second working position. At this time, the stop tooth meshes with the locking rack 71. Since the locking rack 71 is fixed, the locking plate is also fixed at this time, ensuring that when the printer is working, the conical heads 41 on the two clamping plates 2 will not slide relative to the bottom plate 1, ensuring that the paper roll is clamped for a long time.

[0060] Finally, the locking assembly 7 further includes a locking handle 75 and a limit card plate 76;

[0061] The locking handle 75 is rotatably installed on the clamping plate 2. One end of the locking handle 75 is provided with a waist-shaped hole 751, and a connecting rod is arranged in the waist-shaped hole 751. The connecting rod is fixedly connected to the stop block 74. Rotating the other end of the locking handle 75 can drive the stop block 74 to slide on the clamping plate 2; the locking handle 75 is provided to facilitate the user to push the stop block 74 to slide on the clamping plate 2.

[0062] The limit clamping plate 76 is fixedly arranged on the clamping plate 2. The limit clamping plate 76 is provided with a limit protrusion 761. On the side of the locking handle 75 facing the limit clamping plate 76, a locking groove 753 is arranged. When the locking handle 75 drives the locking teeth on the locking swing arm 72 to engage with the locking rack 71 through the stop block 74, the limit protrusion 761 can be clamped in the locking groove 753. When the user rotates the locking handle 75 to drive the stop block 74 to move, and then pushes the locking swing arm 72 to the second working position, the limit protrusion 761 on the limit clamping plate 76 is located in the locking groove 753. At this time, the second elastic member 73 is in a stretched state, and the locking swing arm 72 has a tendency to move to the first working position. Therefore, both the stop block 74 and the locking handle 75 have a tendency to move in the direction opposite to the rotation direction of the user. At this time, the limit protrusion 761 being able to be clamped in the locking groove 753 can avoid the above-mentioned movement, that is, the elastic force of the limit clamping plate 76 is used to offset the elastic force of the second elastic member 73, ensuring that the locking teeth on the locking swing arm 72 are always engaged with the locking rack 71.

[0063] It should be understood that the above description of the specific embodiments of the present invention is only for explaining the technical route and characteristics of the present invention, and its purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. However, the present invention is not limited to the above specific embodiments. Any changes or modifications made within the scope of the claims of the present invention should be covered by the protection scope of the present invention.

Claims

1. A paper roll clamping device applied to a blueprint machine, characterized in that, The paper roll clamping device includes: a bottom plate (1), paired clamping plates (2), a synchronous centering assembly (3), and a tapered head assembly (4); The clamping plates (2) are slidably arranged on the bottom plate (1), and the tapered head assemblies (4) are rotatably arranged on the first side surfaces of the clamping plates (2). The tapered head assemblies (4) on the two clamping plates (2) are arranged oppositely, and the two tapered head assemblies (4) are used for mounting paper rolls; The synchronous centering assembly (3) includes paired synchronous racks (31) and a centering gear (32) located between the two synchronous racks (31). The centering gear (32) meshes with the two synchronous racks (31); the centering gear (32) is rotatably mounted on the bottom plate (1), the synchronous racks (31) correspond to the clamping plates (2) one by one, and the synchronous racks (31) are fixedly connected to the clamping plates (2); The tapered head assembly (4) includes: a tapered head (41) and a clamping jaw (42); one end face of the tapered head (41) is rotatably mounted on the clamping plate (2); the side surface of the tapered head (41) includes a guiding surface (411) and a mounting surface (412) which are connected to each other. The guiding surface (411) has a taper. The tapered head assembly (4) is recessed inwardly on the mounting surface (412) to form a plurality of clamping spaces (43). A clamping jaw (42) and a first elastic member (44) are arranged in the clamping space (43). The first end of the clamping jaw (42) is hinged in the clamping space (43). One end of the first elastic member (44) abuts against the second end of the clamping jaw (42), and the other end of the first elastic member (44) abuts against the tapered head assembly (4). The second end of the clamping jaw (42) can extend out of the clamping space (43) under the action of the elastic force of the first elastic member (44).

2. The paper roll clamping device applied to a blueprint machine according to claim 1, wherein, The tapered head (41) includes a first mounting post (413) and a second mounting post (414) which are connected to each other. The diameter of the first mounting post (413) is smaller than that of the second mounting post (414). A plurality of guiding ribs (415) connected to the second mounting post (414) are annularly arranged on the circumferential surface of the first mounting post (413). The end face of the guiding rib (415) far from the circumferential surface of the first mounting post (413) is configured as the guiding surface (411); the circumferential surface of the second mounting post (414) is configured as the mounting surface (412).

3. The paper roll clamping device applied to a blueprint machine according to claim 2, characterized in that, A baffle (45) is fixedly arranged on the end face of one end of the second mounting post (414), and the baffle (45) is rotatably mounted on the bottom plate (1).

4. The paper roll clamping device applied to a blueprint machine according to any one of claims 1-3, characterized in that, The paper roll clamping device further includes a support shaft (5); A first bearing (51) and a shaft sleeve (52) are sleeved on the support shaft (5). A through hole is formed through the tapered head (41), and the tapered head (41) is fixed on the outer ring of the first bearing (51) through the through hole; A second bearing (53) is provided on the bushing (52), and the bushing (52) is rotatably mounted on the clamping plate (2) through the second bearing (53); a driving wheel (54) is fixedly provided on the bushing (52), and the bushing (52) is fixedly connected to the conical head (41), and the bushing (52) can drive the conical head (41) to rotate.

5. The paper roll clamping device applied to a blueprint machine according to claim 4, wherein, A guiding and supporting inclined block (55) is provided at one end of the support shaft (5) close to the conical head (41).

6. The paper roll clamping device applied to a blueprint machine according to claim 4, wherein, The paper roll clamping device further includes a driving assembly (6), and the driving assembly (6) includes: a transmission guide rail (61), a synchronous pulley (62), and a synchronous belt (63); The transmission guide rail (61) is rotatably mounted on the bottom plate (1), the synchronous pulleys (62) are rotatably provided on the second side surfaces of the clamping plates (2), and the synchronous pulleys (62) and the driving wheel (54) are connected by the synchronous belt (63); The synchronous pulley (62) is sleeved on the transmission guide rail (61), the synchronous pulley (62) can slide along the transmission guide rail (61), and the transmission guide rail (61) can drive the synchronous pulley (62) to rotate.

7. The paper roll clamping device applied to a blueprint machine according to claim 6, characterized in that, The driving assembly (6) further includes a tensioning bracket (64) and a tensioning wheel (65); The tensioning bracket (64) is hinged on the second side surface of the clamping plate (2), a tensioning wheel (65) is rotatably provided at one end of the tensioning bracket (64), the side surface of the tensioning wheel (65) can abut against the synchronous belt (63), an arc-shaped fixing groove (641) is provided at the other end of the tensioning bracket (64), and the hinge point of the tensioning bracket (64) and the clamping plate (2) is located between the two ends of the tensioning bracket (64).

8. The paper roll clamping device applied to a blueprint machine according to any one of claims 1 to 3, characterized in that, The paper roll clamping device further includes a locking assembly (7), and the locking assembly (7) includes a locking rack (71), a stop swing arm (72), a second elastic member (73), and a stop block (74); The locking rack (71) is fixedly provided on the bottom plate (1), the stop swing arm (72) is rotatably mounted on the clamping plate (2), and a stop tooth capable of meshing with the locking rack (71) is provided on the stop swing arm (72); One end of the second elastic member (73) is fixedly connected to the stop swing arm (72), and the other end of the second elastic member (73) is fixedly mounted on the clamping plate (2); The stop block (74) is slidably mounted on the clamping plate (2), and when the stop block (74) slides on the clamping plate (2), the stop block (74) can push the stop tooth on the stop swing arm (72) to mesh with the locking rack (71).

9. The paper roll clamping device applied to a blueprint machine according to claim 8, wherein, The locking assembly (7) further includes a locking handle (75) and a limit clamping plate (76); The locking handle (75) is rotatably mounted on the clamping plate (2). One end of the locking handle (75) is provided with a waist-shaped hole (751). A connecting rod is arranged in the waist-shaped hole (751), and the connecting rod is fixedly connected to the stop block (74). Rotating the other end of the locking handle (75) can drive the stop block (74) to slide on the clamping plate (2). The limit clamping plate (76) is fixedly arranged on the clamping plate (2). The limit clamping plate (76) is provided with a limit protrusion (761). A locking groove (753) is arranged on one side of the locking handle (75) facing the limit clamping plate (76). When the locking handle (75) drives the locking teeth on the stop swing arm (72) to engage with the locking rack (71) through the stop block (74), the limit protrusion (761) can be clamped in the locking groove (753).

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