Transmission device for printer and printer

Abstract

The utility model discloses a transmission device for a printer, which is used for driving a driven mechanism to move, and comprises a rack, a driving mechanism and a driving mechanism, the belt transmission assembly comprises a transmission belt, a driving wheel and a driven wheel, and the driven mechanism is in transmission connection with the transmission belt in a transmission mode; the driven wheel is rotatably mounted on the frame by means of a driven wheel support, and the driven wheel support includes: a shaft support portion that supports the driven wheel so that the driven wheel rotates about a first axis; the eccentric supporting part is used for supporting the shaft supporting part on the machine frame in the mode that the shaft supporting part rotates around a second axis, and the first axis and the second axis have a preset eccentric distance; and the rotating position switching part controllably drives the shaft supporting part to rotate around a second axis along with the shaft supporting part, a plurality of position keeping parts are arranged on the rack, the position keeping parts correspond to a plurality of rotating positions of the rotating position switching part, and the position keeping parts are arranged to be detachably connected with the rotating position switching part. The utility model further provides a printer.

Description

TECHNICAL FIELD

[0001] The utility model relates to a printer technology, specifically, a kind of transmission device and printer for printer. BACKGROUND

[0002] Patent application CN202210285741.3 discloses a kind of paper cutting device of printing equipment, it includes rack, motor, driving pulley, driven pulley and endless belt etc., driving pulley rotates and drives endless belt to move.For the installation precision requirement of the foregoing technical solution driving pulley, driven pulley, if driving pulley, driven pulley exists installation deviation, endless belt can not be tensioned, affect the movement of endless belt.In printing equipment, using endless belt to drive specific function component to move is not limited to the technical solution disclosed in patent application CN202210285741.3, also has application on ink-jet printing equipment, for example, the print head maintenance station device in the ink-jet printer disclosed in patent application CN2275519Y, this scheme is by belt to drive moving frame and print head to move.How to conveniently adjust the tension degree of endless belt is the technical point that existing printing equipment needs to be further optimized.In view of the above, the present application is proposed. SUMMARY

[0003] The technical problem to be solved by the utility model is to provide a kind of transmission device for printer to solve the problem that the tension degree of endless belt is not easy to control in existing printing equipment.

[0004] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a kind of transmission device for printer, for driving driven mechanism to move, include: rack;Belt drive assembly, it includes transmission belt, driving pulley and driven pulley, the transmission belt is arranged on the outer periphery side of driving pulley and driven pulley and is engaged with transmission, the driven mechanism is transmissionally connected with the transmission belt;Wherein, the driven pulley is rotatably installed on the rack by driven pulley support, the driven pulley support includes: shaft support portion, it supports the driven pulley in a manner that the driven pulley rotates around first axis;Eccentric support portion, it is with the shaft support portion (supported on the rack, the first axis and the second axis have preset eccentricity;Rotational position switching portion, it controllably drives the shaft support portion to rotate around second axis, and a plurality of position holding portions are provided on the rack, a plurality of the position holding portions correspond to a plurality of rotational positions of rotational position switching portion, and are set to be able to separably engage the rotational position switching portion.

[0005] Preferably, the shaft support portion, the eccentric support portion and the rotational position switching portion are integrally formed.

[0006] Preferably, the eccentric supporting part has a first rotation joint end and a second rotation joint end, which are arranged on two sides of the shaft supporting part along the extension direction of the second axis; the rotation position switching part is jointed to the second rotation joint end.

[0007] Preferably, a plurality of the position maintaining parts are arranged in a circumferential direction and are spaced apart around the second axis.

[0008] Preferably, the position maintaining part is a via hole formed in the rack, and the rotation position switching part has an embedded part matched with the via hole.

[0009] Preferably, the embedded part is connected to the eccentric supporting part by an elastic arm.

[0010] Preferably, a clearance groove is formed in the part of the elastic arm close to the eccentric supporting part.

[0011] Preferably, the rack has a first mounting groove and a second mounting groove, which are perpendicular to each other in the extension direction; the driving wheel is rotatably mounted in the first mounting groove of the rack by a driving wheel supporting member, and the driven wheel is rotatably mounted in the second mounting groove of the rack by a driven wheel supporting member.

[0012] Preferably, a side limiting wall is arranged between the shaft supporting part and the second rotation joint end to limit the movement of the driven wheel to the side of the second rotation joint end along the first axis.

[0013] The application further provides a printer comprising a driven mechanism and the transmission device for the printer as described in any one of the preceding embodiments, wherein the driven mechanism is a moving knife assembly or an inkjet printing unit.

[0014] By adopting the above technical scheme, the application has the following beneficial effects:

[0015] 1. The transmission device for the printer of the application, the driven wheel is sleeved on the shaft supporting part and takes the first axis as the rotation center, the shaft supporting part is supported on the rack by the eccentric supporting part and takes the second axis as the rotation center, the first axis and the second axis are eccentrically arranged, the position of the driven wheel can be changed correspondingly after the shaft supporting part is rotated by the rotation position switching part, in this way, the relative position of the driven wheel and the driving wheel can be changed, the tension degree of the transmission belt is conveniently adjusted, the rotation position switching part can be conveniently positioned by jointing the rotation position switching part with the corresponding position maintaining part, thereby the driven wheel supporting member is positioned.

[0016] 2、The rack has a first mounting slot and a second mounting slot, and the extension directions of the two are perpendicular to each other, when the driving wheel is rotatably installed in the first mounting slot by the driving wheel support, and the driven wheel is installed in the second mounting slot by the driven wheel support, the transmission belt is in a pre-tightening state, at this time, if the tightness of the belt is just right, no adjustment of the tightening state is needed by rotating the position switching part, if the tightness of the belt is slightly loose, only the position of the shaft support part is switched by rotating the position switching part to slightly adjust the tightness, and the installation and tightness adjustment of the belt transmission assembly are convenient. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings of the embodiments will be briefly introduced as follows, obviously, the drawings described in the following are only related to some embodiments of the present application, but not limit the present application.

[0018] Figure 1 and Figure 2 respectively show the schematic diagram of the paper cutting mechanism for the printer in different views according to an embodiment;

[0019] Figure 3 show the first exploded view of the paper cutting mechanism for the printer according to an embodiment;

[0020] Figure 4 show the second exploded view of the paper cutting mechanism for the printer according to an embodiment;

[0021] Figure 5 show the third exploded view of the paper cutting mechanism for the printer according to an embodiment;

[0022] Figure 6 show the fourth exploded view of the paper cutting mechanism for the printer according to an embodiment;

[0023] Figure 7 show the change diagram of the driven wheel support in different position changes;

[0024] Figure 8 show the exploded view of the separation of the driving wheel and the driving wheel support;

[0025] Figure 9 show the schematic diagram of the driving wheel installed in the driving wheel support;

[0026] Figure 10 show the schematic diagram of the driven wheel installed in the driven wheel support;

[0027] Figure 11 and Figure 12 respectively show the exploded view of the separation of the driven wheel and the driven wheel support in different views.

[0028] REFERENCE NUMERALS:

[0029] Rack 1, front wall 1A, rear wall 1B, bottom wall 1C, moving knife assembly 2, fixed knife 3, motor 4, transmission belt 5, driving wheel 6, driven wheel 7, gear transmission assembly 8, first mounting slot T1, second mounting slot T2. DETAILED DESCRIPTION

[0030] To make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the present application will be further described in detail below with reference to the drawings. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts fall within the scope of protection of the present application.

[0031] Some embodiments of the present application will be described in detail below with reference to the drawings. The features in the following embodiments can be combined with each other without conflict.

[0032] In combination Figures 1 to 12 In an embodiment, the paper cutting mechanism for a printer of the present application comprises a rack 1, a moving knife assembly 2, a fixed knife 3, a motor 4, a transmission belt 5, a driving wheel 6, a driven wheel 7 and a gear transmission assembly 8. The driving wheel 6 is rotatably mounted on the rack 1 by a driving wheel support P1, and the driven wheel 7 is rotatably mounted on the rack 1 by a driven wheel support P2. The transmission belt 5, the driving wheel 6 and the driven wheel 7 form a belt transmission assembly, and the belt transmission assembly and the rack 1 cooperate to form a transmission device, which is used to drive the moving knife assembly 2 (i.e. the driven mechanism in the embodiment is the moving knife assembly 2) to move in a set path (in combination Figure 3 , move in the left-right direction). The motor 4 is drivingly connected to the driving wheel 6 through the gear transmission assembly 8 to drive the driving wheel 6 to rotate. The following will be further described in combination with the drawings. For the convenience of description, the X direction in the drawings is the direction from right to left, the Y direction is the direction from front to back, and the Z direction is the direction from bottom to top.

[0033] In combination Figure 3 The rack 1 has a front wall 1A located at the front side, a rear wall 1B located at the rear side, and a bottom wall 1C located at the lower side, and the bottom wall 1C connects the front wall 1A and the rear wall 1B. In combination Figure 4The front wall 1A and the rear wall 1B of the rack 1 each have a first mounting slot T1 for mounting the driving wheel support P1, the first mounting slot T1 extending in the left-right direction, and a second mounting slot T2 for mounting the driven wheel support P2, the second mounting slot T2 extending in the up-down direction, that is, the extending directions of the first mounting slot T1 and the second mounting slot T2 are perpendicular to each other. The second mounting slot T2 has a mounting section T21 and a rotary joint section T22, the mounting section T21 being substantially cuboid-shaped, and the rotary joint section T22 being substantially pie-shaped. The driven wheel support P2 is embedded in the second mounting slot T2 through the mounting section T21 and is in rotary engagement with the rotary joint section T22.

[0034] The movable cutter assembly 2 is drivingly connected to the transmission belt 5 and can slide relative to the rack 1 in the left-right direction under the driving of the transmission belt 5. The specific structure of the movable cutter assembly 2 and the specific principle of cooperation with the fixed cutter 3 to cut the printing medium (such as printing paper) are not the key points of the present application, which are prior art and can be understood by referring to patent application CN202210285741.3 and will not be described in detail.

[0035] The motor 4 and the gear transmission assembly 8 are integrally installed on the right side of the rack 1, and the motor 4 is drivingly connected to the driving wheel 6 through the gear transmission assembly 8. Figure 8 The driving wheel 6 has a first transmission tooth portion 6A engaged with the gear transmission assembly 8.

[0036] The transmission belt 5 is arranged on the outer circumferential side of the driving wheel 6 and the driven wheel 7 and is in engagement transmission with both. Specifically, the driving wheel 6 has a second transmission tooth portion 6B (see Fig. 2) engaged with the transmission belt 5. Figure 8 The driven wheel 7 only has a transmission tooth portion engaged with the transmission belt 5.

[0037] The driving wheel 6 is rotatably installed in the first mounting slot T1 of the rack 1 by the driving wheel support P1. Specifically, in combination with Figure 8 and Figure 9 The driving wheel support P1 includes a shaft support portion P11 and a rotary joint portion P12, the rotary joint portion P12 having rotary joint ends Q11 and Q12 arranged on both sides of the shaft support portion P11 along the axial direction of the shaft support portion P11. The driving wheel 6 is rotatably sleeved on the shaft support portion P11, and the rotary joint ends Q11 and Q12 of the rotary joint portion P12 are installed in the first mounting slot T1, so that the driving wheel 6 is rotatably installed on the rack 1.

[0038] The driven wheel 7 is rotatably installed in the second mounting slot T2 of the rack 1 by the driven wheel support P2. Specifically, in combination with Figures 10 to 12The driven wheel support P2 comprises a shaft support portion P21, an eccentric support portion P22, a rotation position switching portion P23 and a side limiting wall P24, and is integrally formed.

[0039] The central axis of the shaft support portion P21 is the first axis L1, and the driven wheel 7 is rotatably sleeved on the shaft support portion P21, that is, the shaft support portion P21 supports the driven wheel 7 in a manner that the driven wheel 7 rotates around the first axis L1.

[0040] The eccentric support portion P22 is rotatably installed on the second installation groove T2, and in combination Figure 11 , the rotation axis of the eccentric support portion P22 is the second axis L2, and the first axis L1 and the second axis L2 have a preset eccentric distance. The eccentric support portion P22 has a first rotation joint end Q21 and a second rotation joint end Q22, which are arranged on both sides of the shaft support portion P21 along the extension direction of the second axis L2. The eccentric support portion P22 is rotatably connected to the rotation joint segment T22 of the second installation groove T2 through the two rotation joint ends. In this way, the shaft support portion P21 is arranged to be supported on the rack 1 in a manner of rotating around the second axis L2.

[0041] The rotation position switching portion P23 is connected to the second rotation joint end Q22 of the eccentric support portion P22. The rotation position switching portion P23 has a resilient arm K1 and an embedding portion K2, and the embedding portion K2 is connected to the second rotation joint end Q22 of the eccentric support portion P22 through the resilient arm K1. The part of the resilient arm K1 close to the second rotation joint end Q22 of the eccentric support portion P22 is provided with a gap slot G, which enables the resilient arm K1 to better elastically deform. In combination Figure 7 , the rack 1 is provided with a plurality of position maintaining portions (three in this embodiment, S1, S2 and S3), which are distributed at intervals along the circumference with the second axis L2 as the center. In this embodiment, the position maintaining portions are through holes provided on the rack 1, and the embedding portion K2 is matched with the through holes. In combination Figure 7 and Figure 11 , the plurality of position maintaining portions S1 correspond to the plurality of rotation positions of the rotation position switching portion P23, and are arranged to be capable of detachably connecting the rotation position switching portion P23. Specifically, when the resilient arm K1 is elastically deformed under force, the embedding portion K2 is separated from the through hole. At this time, the rotation position switching portion P23 can be controlled to drive the shaft support portion P21 to rotate around the second axis L2, so as to change the position of the shaft support portion P21 and the driven wheel 7 relative to the driving wheel 6, thereby adjusting the tightness of the transmission belt 5. After the tightness of the transmission belt 5 is adjusted, the resilient arm K1 is released, and the resilient arm K1 is elastically reset, so that the embedding portion K2 is connected to another through hole on the rack 1, thereby limiting the rotation of the rotation position switching portion P23.

[0042] The side limiting wall P24 is located between the shaft support part P21 and the second rotating engagement end Q22. The side limiting wall P24 is used to restrict the driven wheel 7 from moving along the first axis L1 to one side of the second rotating engagement end Q22.

[0043] The above is a specific embodiment of the application of the technical concept of this application, but the specific application of the technical concept of this application is not limited to the above embodiment. In another embodiment, the driven mechanism is the inkjet printing unit of an inkjet printer. The inkjet printing unit includes a carriage, an inkjet printhead, and an ink cartridge. The carriage is slidably mounted on the frame and is connected to the drive belt 5. The inkjet printhead and the ink cartridge are both mounted on the carriage. The printing paper moves forward along a first direction, and the belt drive assembly drives the inkjet printing unit to reciprocate along a second direction perpendicular to the first direction to achieve inkjet printing on the printing paper. Other features of the inkjet printer not mentioned can be understood by referring to prior art such as patent application CN2275519Y, and will not be elaborated further.

[0044] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A drive device for a printer for driving a driven mechanism, comprising: a frame (1); a belt drive assembly including a drive belt (5), a driving pulley (6) and a driven pulley (7), the drive belt (5) being wound around the outer circumferential sides of the driving pulley (6) and the driven pulley (7) and engaging with both to drive, the driven mechanism being in driving connection with the drive belt (5); characterized in that: the driven pulley (7) is rotatably mounted on the frame (1) by means of a driven pulley support (P2), the driven pulley support (P2) including: a shaft support portion (P21) supporting the driven pulley (7) in a manner that allows the driven pulley (7) to rotate about a first axis (L1); an eccentric support portion (P22) supporting the shaft support portion (P21) on the frame (1) in a manner that allows the shaft support portion (P21) to rotate about a second axis (L2), the first axis (L1) and the second axis (L2) having a predetermined eccentricity; and a rotational position switching portion (P23) driving the shaft support portion (P21) to rotate about the second axis (L2) in a controlled manner, the frame (1) being provided with a plurality of position holding portions (S1, S2, S3) corresponding to a plurality of rotational positions of the rotational position switching portion (P23) and being configured to be capable of detachably engaging the rotational position switching portion (P23). The shaft support portion (P21), the eccentric support portion (P22) and the rotational position switching portion (P23) are integrally formed. The eccentric support portion (P22) has a first rotational engagement end (Q21) and a second rotational engagement end (Q22) disposed on both sides of the shaft support portion (P21) along the extension direction of the second axis (L2), and the rotational position switching portion (P23) is engaged with the second rotational engagement end (Q22). The plurality of position holding portions (S1, S2, S3) are distributed at intervals in the circumferential direction with the second axis (L2) as the center. wherein The position holding portions (S1, S2, S3) are through holes formed in the frame (1), and the rotational position switching portion (P23) has an engaging portion (K2) adapted to the through holes. The engaging portion (K2) is connected to the eccentric support portion (P22) by means of an elastic arm (K1). The part of the elastic arm (K1) close to the eccentric support portion (P22) is provided with a clearance groove (G). The frame (1) has a first mounting groove (T1) and a second mounting groove (T2) extending in perpendicular directions, the driving pulley (6) is rotatably mounted on the first mounting groove (T1) of the frame (1) by means of a driving pulley support (P1), and the driven pulley (7) is rotatably mounted on the second mounting groove (T2) of the frame (1) by means of the driven pulley support (P2).

2. The transmission for a printer according to claim 1, wherein ​ 3. The transmission for a printer according to claim 2, wherein ​ 4. The transmission for a printer according to any one of claims 1 to 3, characterized in that, ​ 5. The drive apparatus for a printer according to claim 4, wherein ​ 6. The drive apparatus for a printer according to claim 5, wherein ​ 7. The drive apparatus for a printer according to claim 6, wherein ​ 8. The transmission for a printer according to claim 1, wherein ​ 9. The transmission for a printer according to claim 3, wherein A side limiting wall (P24) is arranged between the shaft supporting portion (P21) and the second rotational engagement end (Q22) to limit the movement of the driven wheel (7) to the side of the second rotational engagement end (Q22) along the first axis (L1).

10. A printer characterized by comprising: A printer comprising a driving mechanism which is a moving knife assembly (2) or an inkjet printing unit and a transmission device as claimed in any one of claims 1 to 9.

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