WO2012142900A1 - 双面打印机和双面打印机的送纸控制方法 - Google Patents

双面打印机和双面打印机的送纸控制方法 Download PDF

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Publication number
WO2012142900A1
WO2012142900A1 PCT/CN2012/073189 CN2012073189W WO2012142900A1 WO 2012142900 A1 WO2012142900 A1 WO 2012142900A1 CN 2012073189 W CN2012073189 W CN 2012073189W WO 2012142900 A1 WO2012142900 A1 WO 2012142900A1
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WO
WIPO (PCT)
Prior art keywords
printing
frame
buffer shaft
print
printing medium
Prior art date
Application number
PCT/CN2012/073189
Other languages
English (en)
French (fr)
Inventor
王玉国
王春涛
杨民
高涛
Original Assignee
山东新北洋信息技术股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 山东新北洋信息技术股份有限公司 filed Critical 山东新北洋信息技术股份有限公司
Publication of WO2012142900A1 publication Critical patent/WO2012142900A1/zh

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J15/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, specially adapted for supporting or handling copy material in continuous form, e.g. webs
    • B41J15/16—Means for tensioning or winding the web
    • B41J15/165—Means for tensioning or winding the web for tensioning continuous copy material by use of redirecting rollers or redirecting nonrevolving guides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
    • B41J3/60—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for printing on both faces of the printing material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H20/00—Advancing webs
    • B65H20/02—Advancing webs by friction roller
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H20/00—Advancing webs
    • B65H20/30—Arrangements for accumulating surplus web
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2402/00—Constructional details of the handling apparatus
    • B65H2402/50—Machine elements
    • B65H2402/54—Springs, e.g. helical or leaf springs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
    • B65H2511/10—Size; Dimensions
    • B65H2511/11—Length
    • B65H2511/112—Length of a loop, e.g. a free loop or a loop of dancer rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2515/00—Physical entities not provided for in groups B65H2511/00 or B65H2513/00
    • B65H2515/30—Forces; Stresses
    • B65H2515/31—Tensile forces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2801/00—Application field
    • B65H2801/03—Image reproduction devices
    • B65H2801/09—Single-function copy machines

Definitions

  • FIG. 1 is a schematic diagram of a duplex printer according to the related art. As shown in FIG.
  • the double-sided printing machine of the related art includes a first printing assembly and a second printing assembly, wherein the first printing assembly includes a first printing head 150 supported on the first arm 130 and a second pressure opposite thereto The disc 180, the second printing assembly includes a second printhead 160 supported on the second arm 140 and a first platen 170 opposite thereto.
  • the printing medium passes between the first printhead 150 and the second platen 180, between the second printhead 160 and the first platen 170 in its conveying direction, and the first printhead 150 and the second printhead 160 are respectively The set image or text is printed on the front and back of the print media.
  • a problem with prior art duplex printers is that during printing, the print media located between the two print assemblies may become too tight or slack due to the unsynchronized transport of the print media beneath the two printheads.
  • the printing medium below the second printing head 160 located downstream in the printing medium conveying direction is conveyed at a speed higher than the conveying speed of the printing medium below the first printing head 150 upstream, at the first printing unit
  • the second printing unit transports the printing medium downstream, causing the printing medium between the two printing units to be too tight, and the print quality of the first printing unit will be lowered.
  • the printing medium below the first print head 150 located upstream in the printing medium conveying direction has a conveying speed at the time of startup greater than the conveying speed of the printing medium below the second printing head 160 downstream
  • the printing medium is in two
  • the printing components are stacked, that is, the print medium between the two printing components is slack, and a paper jam problem may occur between the two printing components.
  • the above problems are particularly serious when the types of the two printing components are different, for example, when one printing component is of the thermal printing component and the other printing component is of the pin printing component or the inkjet printing component.
  • the thermal printing component moves uninterruptedly relative to the thermal printhead in the media transport direction during the printing process, while the pin print assembly or inkjet print assembly is in the process of printing, when the pin printhead or inkjet printhead is along After the print media width direction reciprocating motion is completed, the print media moves intermittently along the media transport direction. Therefore, even if the average print speed of the two print components is the same during the printing process, the two print components will inevitably appear.
  • the print medium is too tight or slack, resulting in a problem of reduced print quality or paper jam.
  • the present invention is directed to a double-sided printer to effectively avoid the problem of over-tightening or slack of a print medium between two print assemblies of a duplex printer.
  • an aspect of the present invention provides a duplex printer including a second printing assembly disposed on a frame and a first printing assembly located downstream of the second printing assembly in a printing medium conveying direction, and the first printing assembly And a buffer mechanism disposed between the second printing assembly, wherein the buffer mechanism comprises: a buffer shaft and an elastic member, wherein both ends of the buffer shaft are supported in guiding grooves on both sides of the printing medium conveying passage, and the buffer shaft has a guiding groove in the guiding groove Deviated from the movement trend of the printing medium conveying passage, the elastic members are located at both ends of the buffer shaft, one end is connected to the frame, and the other end is connected to the buffer shaft.
  • the frame includes a first frame and a second frame that are hinged to each other, and the first frame may be opened or closed with respect to the second frame, wherein the buffer shaft and the elastic member are disposed together on the first frame or the second frame.
  • the buffer shaft is disposed on the first frame. When the first frame is closed relative to the second frame, the buffer shaft is located at one side of the second frame and is in contact with the surface of the printing medium, and the elastic member provides a direction to the buffer shaft. An elastic force directed to one side of the second frame. Further, the buffer shaft is disposed on the second frame.
  • the buffer shaft When the first frame is closed relative to the second frame, the buffer shaft is located at one side of the first frame and is in contact with the surface of the printing medium, and the elastic element provides a direction to the buffer shaft. An elastic force directed to one side of the first frame. Further, the guiding groove extends in a direction perpendicular to the printing medium conveying passage. Further, the buffer mechanism of the double-sided printer further includes a cam disposed adjacent to the guide groove, wherein the cam is in pressure contact with the buffer shaft when the first frame is opened relative to the second frame, and the elastic member is maintained in a tension state, and The cam is offset from the buffer shaft after the first frame is closed relative to the second frame.
  • the first printing component is a thermal printing component
  • the second printing component is a pin printing component or an inkjet printing component
  • the first printing component is a pin printing component or an inkjet printing component
  • the second printing component is a thermal printing component.
  • a buffer mechanism is provided between the two printing assemblies, which enables the printing medium between the two printing assemblies to always maintain a moderately tensioned state, thereby avoiding two printings.
  • the buffer mechanism has a simple structure, and the length of the printing medium conveying passage is small, so that the structure of the double-sided printer is compact, and in addition, by providing the buffer mechanism, the first printing unit and the second printing are relaxed. Requirements for the type of component and the order of alignment along the direction of transport of the print media.
  • the paper feed control method of the double-sided printer of the present invention is applicable to paper rolls of various outer diameters without manual paper pulling operation.
  • FIG 1 is a schematic view of a double-sided printer according to the related art
  • FIG. 2 is a schematic structural view of a double-sided printer according to a first embodiment of the present invention
  • FIG. 3 is a print of a double-sided printer according to a first embodiment of the present invention
  • 4 is a schematic structural view of a double-sided printer according to a second embodiment of the present invention
  • FIG. 5 is a schematic view showing a printing medium installation of a double-sided printer according to a second embodiment of the present invention
  • FIG. 1 is a schematic view of a double-sided printer according to the related art
  • FIG. 2 is a schematic structural view of a double-sided printer according to a first embodiment of the present invention
  • FIG. 3 is a print of a double-sided printer according to a first embodiment of the present invention
  • 4 is a schematic structural view of a double-sided printer according to a second embodiment of the present invention
  • FIG. 5 is a schematic view showing a printing medium installation of a double
  • FIG. 7 is a schematic structural view of a double-sided printer according to a fourth embodiment of the present invention
  • FIG. 8 is a schematic structural view of a double-sided printer according to a fifth embodiment of the present invention
  • Figure 9 is a schematic view showing the mounting of a printing medium of a duplex printer according to a fifth embodiment of the present invention. Description of the reference numerals
  • first frame 20 second frame
  • the duplex printer includes a first printing unit 1, a second printing unit 2, and a buffer mechanism 3, and a paper bin 4.
  • the paper bin 4 is for accommodating the printing medium P, and along the printing medium conveying direction, a second printing unit 2 is disposed downstream of the paper magazine 4, and a first printing unit 1 is disposed downstream of the second printing unit 2.
  • the first printing assembly 1 is for printing on the first side of the printing medium, and the first printing unit 1 includes a first printing head 11 and a first platen portion 12 disposed opposite to the first printing head 11; Printing on the second side of the printing medium, comprising a second printing head 21 and a second platen portion 22 disposed opposite to the second printing head 22; in the printing medium conveying direction, the buffer mechanism 3 is disposed in the first printing assembly 1 Between the second printing assemblies 2, the printing medium located between the first printing unit 1 and the second printing unit 2 is always maintained in a moderately tensioned state during printing.
  • the first print head 11 and the second print head 21 may be any one of a print head such as a thermal print head, a pin print head or an ink jet print head.
  • the first print head 11 and the second print are used.
  • the head 21 is a thermal print head; the first platen portion 12 and the second platen portion 22 may be a rotating platen roller, or may be a stationary pad or the like, and the first platen portion in this embodiment
  • the 12 and second platen portions 22 are both platen rollers for supporting and conveying the printing medium between the thermal head and the platen roller.
  • Each of the print heads and each of the platen portions are disposed on the frame, wherein the frame may include a plurality of portions, and the portions may be movably connected, and the print head and the platen portion of each of the printing assemblies may be disposed in the frame On the same part, it can also be placed on different parts of the frame.
  • the double-sided printer includes a first frame 10 and a second frame 20, wherein the first frame 10 and the second frame 20 are relatively mated, and preferably, the first frame 10 is coupled to the second frame 20 via the rotating shaft 30. Hinged, can be opened or closed relative to the second frame 20. When the first frame 10 is opened relative to the second frame 20, the paper bin 4 formed in the second frame 20 is opened, and the printing medium P can be replaced.
  • the first print head 11 of the first printing unit 1 and the second platen portion 22 of the second printing unit 2 are disposed on the second frame 20, and the first platen portion 12 and the second printing unit 2 of the first printing unit 1
  • the second print head 21 is disposed on the first frame 10, wherein when the first frame 10 is closed relative to the second frame 20, the first print head 11 and the first platen portion 12 are tangentially matched, and the second print head 21
  • the second platen portion 22 is tangentially engaged; when the first frame 10 is opened relative to the second frame 20, the first print head 11 and the first platen portion 12 are separated, and the second print head 21 and the second platen portion 22 are separated. Separation.
  • the buffer mechanism 3 may be disposed on the first frame 10 or on the second frame 20 in the conveying direction of the printing medium P, and the buffer mechanism 3 is located between the first printing unit 1 and the second printing unit 2.
  • the buffer mechanism 3 includes a buffer shaft 31 and an elastic member 32, wherein the buffer shaft 31 is movably supported on the first frame 10 or the second frame 20 in the width direction of the printing medium, and the buffer shaft 31 is disposed away from the conveying path of the printing medium, and can be set.
  • the elastic member 32-end is connected to the buffer shaft 31, such as suspension or support cushioning.
  • the buffer shaft 31 is connected to the frame, and under the action of the elastic member 32, the buffer shaft 31 always maintains a tendency to deviate from the movement of the printing medium conveying passage.
  • the buffer mechanism 3 is disposed on the second frame 20.
  • the buffer shaft 31 is located at the same one of the first medium frame 10 in the print medium conveying path.
  • the printing medium is installed, it is only necessary to bypass the printing medium from above the buffer shaft 31, and paper printing is not required, which improves the operation convenience.
  • a first long slot 201 (ie, a guide slot) is disposed on the second frame 20 along a direction perpendicular to the print medium conveying path, and the first long slot 201 is located in the first print head 11 and the second platen Between 22, when the first frame 10 is closed relative to the second frame 20, the first long slot 201 is located on the same side of the print medium conveying path as the first frame 10.
  • the buffer shaft 31 is mated with the first long slot 201, and is movable in a direction away from the printing medium conveying passage along the longitudinal direction of the first long slot 201; the elastic member 32-end is connected to the buffer shaft 31, and the other end is connected The two frames 20 are connected, and under the action of the elastic member 32, the buffer shaft 31 always maintains a tendency to deviate from the movement path of the printing medium.
  • 3 is a schematic view showing the mounting of a printing medium of a duplex printer according to a first embodiment of the present invention. As shown in FIG. 3, the first frame 10 is first rotated about the rotating shaft 30, and opened relative to the second frame 20.
  • the first platen portion 12 and the second printing head 21 are opposed to the first print head 11 and the second platen.
  • the portion 22 is separated, and the printing medium is pulled out from the paper bin 4, first passes through the second platen portion 22, bypassed from above the buffer shaft 31, passes through the first print head 11, and then exits the printer through the outlet, and the printing medium is printed.
  • Straightening, and closing the first frame 10 relative to the second frame 20, at this time the printing medium is at a point tangent to the first printing head 11 and the first platen portion 12, and the second printing head 21 and the second platen portion 22 The tangential point is pressed at two places.
  • the printing medium presses the buffer shaft 31, and the buffer The shaft 31 is acted upon by the elastic member 32 to moderately tension the printing medium.
  • the two print components begin to print.
  • the print media between the two print components during the print process may be slack or too loose due to the unsynchronized print media under the two printheads. Tight phenomenon. If the print medium under the second print head located upstream is transported at a higher speed than the print medium below the first print head downstream, the print medium is stacked between the two print units, and printing occurs.
  • the medium relaxation phenomenon at this time, the buffer shaft 31 disposed between the two printing components is acted by the elastic member 32 to move away from the printing medium conveying passage, so that the slack printing medium is moderately tensioned, thereby avoiding the printing medium in two
  • the printing components are stacked and there is a problem with paper jams.
  • the first print unit is not finished when the second print unit has not finished printing
  • the printing medium is conveyed downstream, causing the printing medium between the two printing units to be tensioned, and the tensioned printing medium will press the buffer shaft 31 against the elastic force of the elastic member 32 to move toward the printing medium conveying path, so that printing The media is moderately relaxed, avoiding the problem of affecting the print quality of the second printing component due to the tightness of the print media between the two printing components.
  • the buffer mechanism 3 may also be disposed on the first frame 10 as required by the structural design dimensions.
  • FIG. 4 is a schematic structural view of a duplex printer according to a second embodiment of the present invention
  • FIG. 5 is a schematic view showing the mounting of a printing medium of the duplex printer according to the second embodiment of the present invention.
  • This embodiment is different from the previous embodiment in that the buffer mechanism 3 in this embodiment is disposed on the first frame 10. When the first frame 10 is closed relative to the second frame 20, the buffer mechanism 3 is located in the second One side of the frame 20.
  • the buffer shaft 31 is movably coupled to the first frame 10, and when the first frame 10 is closed relative to the second frame 20, the buffer shaft 31 is located on the same side of the print medium conveying path and the second frame 20, perpendicular to the printing medium In the direction of the conveying passage, a second long slot 101 is disposed in the first frame 10, and the second slot 101 is located between the first platen 12 and the second printhead 21, when the first frame 10 is opposite to the second When the frame 20 is closed, the second long slot 101 is located on the same side of the print medium conveying path as the second frame 20.
  • the buffer shaft 31 is inserted into the second long slot 101, and can move in a direction away from the printing medium conveying passage along the longitudinal direction of the second long slot 101; the elastic member 32-end is connected to the buffer shaft 31, and the other end is connected to the first
  • the frame 10 is connected, and under the action of the elastic member 32, the buffer shaft 31 always maintains a tendency to deviate from the movement of the printing medium conveying path.
  • the buffer mechanism 3 is opened together with the first frame 10.
  • FIG. 6 is a block diagram showing the structure of a duplex printer in accordance with a third embodiment of the present invention.
  • the second printing component in this embodiment is a non-thermal printing component such as a pin printing component or an inkjet printing component. Since the embodiment of the first printing component and the buffering mechanism is the same as that of the first embodiment, the description of the second printing component will be described below.
  • the second printing component is a stylus printing assembly, including a stylus print head 23 and a backing plate 24, and a transport roller set 25, wherein the printing end surface 231 of the stylus print head 23 is opposite to the backing plate 24, Between the set distances, the pin print head 23 can reciprocate along the length of the pad 24, during the movement of the pin print head 23, the print pin will cover the ink ribbon (not shown) on the end face of the print head.
  • the ink is struck onto the print medium to form a set image and text; the transport roller set 25 is used to transport the print medium between the pin print head 23 and the print pad 24 downstream.
  • the transport roller group 25 pauses the transport, and the needle print head 23 reciprocates along the width direction of the print medium.
  • the transport mechanism 25 drives the print medium along the medium transport. The direction is moved so that the dot print head 23 performs the next line of printing.
  • the print medium is first passed between the stylus print head 23 of the stylus print assembly and the backing plate 24, bypassing the buffer shaft 31 of the buffer mechanism 3, and from the first print head of the thermal print assembly.
  • the thermal print component and the stylus print component start printing, and the print speed is intermittently moved relative to the stylus print head, thereby continuously moving relative to the thermal print head, so even at the average print speed
  • the printing medium of the downstream thermal printing unit has a conveying speed at the time of startup greater than the conveying speed of the printing medium of the upstream needle printing unit, so that the thermal printing unit pulls the printing medium, The printing medium between the two printing components is tensioned.
  • FIG. 7 is a block diagram showing the structure of a duplex printer in accordance with a fourth embodiment of the present invention.
  • the first printing component in this embodiment is a non-thermal printing component, such as a dot printing component or an inkjet printing component
  • the second printing component is a thermal printing component.
  • the non-thermal print assembly is still described by taking a pin print assembly as an example.
  • the dot print assembly and the thermal print assembly start printing. Since the print medium moves intermittently with respect to the needle print head, it moves continuously with respect to the thermal print head, so the average print speed is the same. In the case where the printing medium of the downstream needle printing unit is transported at a lower speed than the printing medium of the upstream thermal printing unit at the start-up speed, the printing medium is deposited between the two printing units, ie The printing medium between the two printing components is slack.
  • the buffer shaft 31 located between the two printing components supports the printing medium to move away from the printing medium conveying passage under the action of the elastic member 32, so that the slack printing medium is released. It is moderately tensioned, thereby avoiding the accumulation of print media between the two printing components, and the problem of jamming occurs.
  • the present invention also provides a paper feeding control method for a double-sided printer. That is, the conveying mechanism of the second printing unit located upstream is stopped before the printing task is performed, and the conveying mechanism of the first printing unit located downstream is conveyed downstream to the printing medium of the set length so that the elastic member 32 of the buffering mechanism is at a moderate degree.
  • FIG. 8 is a schematic view showing the structure of a duplex printer according to a fifth embodiment of the present invention
  • Figure 9 is a schematic view showing the mounting of a printing medium of a duplex printer according to a fifth embodiment of the present invention. As shown in FIG.
  • the embodiment is different from the above embodiments in that the buffer mechanism further includes a cam 33 adjacent to the first long slot 201 and pivotally connected to the second frame 20 via the shaft 331 , wherein When the first frame 10 is opened relative to the second frame 20, the control cam 33 is in pressure contact with the buffer shaft 31, the buffer shaft 31 is held in the tension position (as shown in FIG. 9), and the first frame 10 is opposite to the second frame.
  • the control cam 33 is offset from the buffer shaft 31 after the frame 20 is closed.
  • the embodiment is suitable for the printing medium conveying speed of the first printing component 1 at the time of startup is greater than the printing medium conveying speed of the second printing component 2 at the time of starting, and the paper roll is easy to rotate and the printing medium is buffered when the paper roll is replaced. Where the shaft does not moderately tension the print media. It should be noted that, in the double-sided printers of the first, second, third, and fourth embodiments, if the printing medium transport speed of the first printing component at the time of startup is greater than the printing medium of the second printing component at the time of startup Conveying speed, no manual paper pulling operation is required.
  • the printing component may be two or more, and the printing type may be any one of printing methods such as thermal printing, pin printing, or inkjet printing, and the buffer mechanism is a group or More than one set, and a buffer mechanism is provided between every two printing assemblies, thereby avoiding the problem of too tight or slack of the print medium between the two printing assemblies.
  • the buffer mechanism has a simple structure, and the length of the printing medium conveying passage is small, so that the structure of the double-sided printer is compact, and in addition, by providing the buffer mechanism, the first printing unit and the second printing are relaxed. Requirements for the type of component and the order of alignment along the direction of transport of the print media.

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  • Printers Characterized By Their Purpose (AREA)

Description

双面打印机和双面打印机的送纸控制方法 本申请要求 2011年 4月 22日提交至中国知识产权局的、申请号为 201110102391.4、 名称为 "双面打印机和双面打印机的送纸控制方法" 的中国发明专利申请的优先权， 其全部内容结合于此供参考。 技术领域 本发明涉及打印机， 尤其涉及一种双面打印机和双面打印机的送纸控制方法。 背景技术 图 1是根据相关技术的双面打印机的示意图。 如图 1所示， 相关技术中的双面打 印机包括第一打印组件和第二打印组件， 其中第一打印组件包括支撑在第一臂 130上 的第一打印头 150和与其相对的第二压盘 180， 第二打印组件包括支撑在第二臂 140 上的第二打印头 160和与其相对的第一压盘 170。 打印介质沿其输送方向从第一打印头 150和第二压盘 180之间、 第二打印头 160 和第一压盘 170之间穿过， 第一打印头 150和第二打印头 160分别在打印介质的正反 面打印出设定的图像或文字。 现有技术的双面打印机的问题在于， 在打印过程中， 位于两个打印组件之间的打 印介质可能会由于两个打印头下方的打印介质输送不同步而出现过紧或者松弛现象。 当沿打印介质输送方向位于下游的第二打印头 160下方的打印介质在启动时的输 送速度大于位于上游的第一打印头 150下方的打印介质在启动时的输送速度， 那么在 第一打印组件还没有完成打印时第二打印组件就会向下游输送打印介质， 导致两个打 印组件之间的打印介质过紧， 这时， 将降低第一打印组件的打印质量。 当沿打印介质输送方向位于上游的第一打印头 150下方的打印介质在启动时的输 送速度大于位于下游的第二打印头 160下方的打印介质在启动时的输送速度， 那么打 印介质在两个打印组件之间堆积， 即两个打印组件之间的打印介质松弛， 这时有可能 会在两个打印组件之间产生塞纸问题。 上述问题在两个打印组件的类型不一样时尤其严重， 例如， 当一个打印组件的类 型为热敏打印组件， 另一个打印组件的类型为针式打印组件或者喷墨打印组件。 由于热敏打印组件在打印过程中打印介质相对热敏打印头沿介质输送方向不间断 移动， 而针式打印组件或者喷墨打印组件在打印过程中， 当针式打印头或喷墨打印头 沿打印介质宽度方向往返运动完成打印后， 打印介质沿介质输送方向间歇移动， 因此， 这种双面打印机在打印过程中即使两个打印组件的平均打印速度相同， 也必然会出现 两个打印组件之间的打印介质过紧或松弛现象，从而产生降低打印质量或塞纸的问题。 发明内容 本发明旨在提供一种双面打印机， 以有效避免双面打印机的两个打印组件之间的 打印介质过紧或松弛的问题。 本发明的目的还在于提供一种双面打印机的送纸控制方 法。 为此， 本发明一方面提供了一种双面打印机， 包括在机架上设置的第二打印组件 和沿打印介质输送方向位于第二打印组件下游的第一打印组件， 以及在第一打印组件 和第二打印组件之间设置的缓冲机构， 其中， 该缓冲机构包括： 缓冲轴和弹性元件， 缓冲轴的两端支撑在打印介质输送通道两侧的导向槽中， 缓冲轴在导向槽中具有偏离 打印介质输送通道的运动趋势， 弹性元件位于缓冲轴的两端， 一端与机架连接， 另一 端与缓冲轴连接。 进一步地， 上述机架包括相互铰接的第一框架和第二框架， 第一框架可以相对第 二框架打开或闭合， 其中， 缓冲轴和弹性元件共同设置于第一框架或第二框架上。 进一步地， 上述缓冲轴设置在第一框架上， 当第一框架相对第二框架闭合时， 缓 冲轴位于第二框架的一侧， 并与打印介质的表面相接触， 弹性元件向缓冲轴提供方向 指向第二框架一侧的弹性力。 进一步地， 上述缓冲轴设置在第二框架上， 当第一框架相对第二框架闭合时， 缓 冲轴位于第一框架的一侧， 并与打印介质的表面相接触， 弹性元件向缓冲轴提供方向 指向第一框架一侧的弹性力。 进一步地， 上述导向槽的延伸方向垂直于打印介质输送通道。 进一步地， 上述双面打印机的缓冲机构还包括邻近导向槽设置的凸轮， 其中， 在 第一框架相对于第二框架打开时凸轮与缓冲轴抵压接触、使弹性元件保持在张紧状态， 并且在第一框架相对于第二框架闭合后凸轮偏离缓冲轴。 进一步地， 上述第一打印组件为热敏打印组件， 第二打印组件为针式打印组件或 者喷墨打印组件。 进一步地， 上述第一打印组件为针式打印组件或者喷墨打印组件， 第二打印组件 为热敏打印组件。 根据本发明的另一方面， 提供了一种上述构造的双面打印机的送纸控制方法， 包 括在执行打印任务前控制位于上游的第二打印组件的输送机构静止， 控制位于下游的 第一打印组件的输送机构向下游输送设定长度的打印介质。 在本发明提供的双面打印机中， 在两个打印组件之间设置有缓冲机构， 该缓冲机 构使两个打印组件之间的打印介质能够始终保持适度张紧的状态， 从而避免了两个打 印组件之间的打印介质过紧或松弛的问题。 在本发明的双面打印机中， 缓冲机构结构简单， 占用打印介质输送通道的长度较 小， 使得双面打印机的结构紧凑， 另外， 通过设置缓冲机构， 放宽了对第一打印组件 和第二打印组件的类型的要求和沿打印介质输送方向的排列顺序的要求。 本发明的双 面打印机的送纸控制方法， 无需手动拉纸操作， 适用于各种外径的纸卷。 除了上面所描述的目的、特征和优点之外， 本发明具有的其它目的、特征和优点， 将结合附图作进一步详细的说明。 附图说明 构成本说明书的一部分、 用于进一步理解本发明的附图示出了本发明的优选实施 例， 并与说明书一起用来说明本发明的原理。 图中： 图 1是根据相关技术的双面打印机的示意图； 图 2是根据本发明第一实施例的双面打印机的结构示意图； 图 3是根据本发明第一实施例的双面打印机的打印介质安装示意图； 图 4是根据本发明第二实施例的双面打印机的结构示意图； 图 5是根据本发明第二实施例的双面打印机的打印介质安装示意图； 图 6是根据本发明第三实施例的双面打印机的结构示意图； 图 7是根据本发明第四实施例的双面打印机的结构示意图； 图 8是根据本发明第五实施例的双面打印机的结构示意图； 以及 图 9是根据本发明第五实施例的双面打印机的打印介质安装示意图。 附图标记说明
1第一打印组件 2第二打印组件
3缓冲机构 4纸仓
11第一打印头 12第一压纸部
21第二打印头 22第二压纸部
10第一框架 20第二框架
201第一长槽孔 32弹性元件
101第二长槽孔 31缓冲轴
23针式打印头 24垫板
25输送辊组。 具体实施方式 以下结合附图对本发明的实施例进行详细说明， 但是本发明可以由权利要求限定 和覆盖的多种不同方式实施。 图 2是根据本发明第一实施例的双面打印机的结构示意图。 如图 2所示， 双面打 印机包括第一打印组件 1、 第二打印组件 2和缓冲机构 3， 以及纸仓 4。 纸仓 4用于容 纳打印介质 P， 沿打印介质输送方向， 在纸仓 4下游设置有第二打印组件 2， 在第二打 印组件 2的下游设置有第一打印组件 1。 第一打印组件 1用于在打印介质的第一面打印， 第一打印组件 1包括第一打印头 11和与第一打印头 11相对设置的第一压纸部 12; 第二打印组件 2用于在打印介质的 第二面打印， 包括第二打印头 21和与第二打印头 22相对设置的第二压纸部 22; 沿打 印介质输送方向， 缓冲机构 3设置在第一打印组件 1与第二打印组件 2之间， 用于在 打印过程中， 使位于第一打印组件 1和第二打印组件 2之间的打印介质始终保持适度 张紧状态。 其中， 第一打印头 11和第二打印头 21可以是热敏打印头、 针式打印头或者喷墨 打印头等打印头中的任意一种， 本实施例中第一打印头 11和第二打印头 21均为热敏 打印头； 第一压纸部 12和第二压纸部 22可以是转动的压纸辊， 也可以为固定不动的 垫板等， 本实施例中第一压纸部 12和第二压纸部 22均为压纸辊， 压纸辊用于支撑并 输送位于热敏打印头与压纸辊之间的打印介质。 上述各打印头和各压纸部均设置于框架上， 其中， 框架可以包括多个部分， 各个 部分之间可以是活动连接的， 每个打印组件的打印头和压纸部可以设置在该框架的同 一个部分上， 也可以设置在该框架的不同部分上。 图 2示出了框架包括两个部分， 每个打印组件的打印头和压纸部分别设置在框架 的不同部分上的情况。 如图 2所示， 双面打印机包括第一框架 10和第二框架 20， 其 中， 第一框架 10和第二框架 20相对配合， 优选地， 第一框架 10通过转轴 30与第二 框架 20相铰接， 可以相对第二框架 20打开或闭合。 当第一框架 10相对于第二框架 20打开时， 形成于第二框架 20内的纸仓 4敞开， 可以更换打印介质 P。 第一打印组件 1的第一打印头 11和第二打印组件 2的第二压纸部 22设置在第二 框架 20上，第一打印组件 1的第一压纸部 12和第二打印组件 2的第二打印头 21设置 在第一框架 10上， 其中， 当第一框架 10相对第二框架 20闭合时， 第一打印头 11和 第一压纸部 12相切配合， 第二打印头 21和第二压纸部 22相切配合； 当第一框架 10 相对第二框架 20打开时， 第一打印头 11和第一压纸部 12分离， 第二打印头 21和第 二压纸部 22分离。 缓冲机构 3可以设置在第一框架 10上， 也可以设置在第二框架 20上， 沿打印介 质 P输送方向， 缓冲机构 3位于第一打印组件 1和第二打印组件 2之间。 缓冲机构 3包括缓冲轴 31和弹性元件 32， 其中， 缓冲轴 31沿打印介质宽度方向 活动地支撑在第一框架 10或第二框架 20上，缓冲轴 31偏离打印介质的输送通道设置， 可以设置在打印介质输送通道的与第一框架 10相同一侧，也可以设置在打印介质输送 通道的与第二框架 20相同的一侧； 弹性元件 32—端与缓冲轴 31连接，例如悬挂或支 撑缓冲轴， 另一端与框架连接， 在弹性元件 32的作用下， 缓冲轴 31始终保持偏离打 印介质输送通道的运动趋势。 优选地， 本实施例中将缓冲机构 3设置在第二框架 20上， 当第一框架 10相对第 二框架 20闭合时， 缓冲轴 31位于在打印介质输送通道的与第一框架 10相同的一侧， 这样在安装打印介质时， 只需要将打印介质从缓冲轴 31上方绕过即可， 不需要穿纸， 提高了操作简便性。 具体地， 沿垂直于打印介质输送通道方向， 在第二框架 20 上设置有第一长槽孔 201 (即导向槽）， 第一长槽孔 201位于第一打印头 11和第二压纸部 22之间， 当第一 框架 10相对与第二框架 20闭合时， 第一长槽孔 201位于打印介质输送通道的与第一 框架 10相同的一侧。 缓冲轴 31与第一长槽孔 201插接配合， 可以沿第一长槽孔 201 的长度方向向偏离打印介质输送通道的方向移动；弹性元件 32—端与缓冲轴 31连接， 另一端与第二框架 20连接，在弹性元件 32的作用下， 缓冲轴 31始终保持偏离打印介 质输送通道的运动趋势。 图 3是根据本发明第一实施例的双面打印机打印介质安装示意图。 如图 3所示， 首先使第一框架 10绕转轴 30旋转， 相对第二框架 20打开， 此时， 第一压纸部 12和 第二打印头 21相对第一打印头 11和第二压纸部 22分离， 将打印介质由纸仓 4拉出， 首先经过第二压纸部 22， 从缓冲轴 31的上方绕过后， 再经过第一打印头 11， 然后经 出口排出打印机外， 将打印介质拉直， 并使第一框架 10相对第二框架 20闭合， 此时 打印介质在第一打印头 11与第一压纸部 12的相切点、 第二打印头 21与第二压纸部 22的相切点两处被压紧， 在缓冲机构 3的缓冲轴 31处， 由于缓冲轴 31位于打印介质 输送通道的与第一框架 10相同的一侧， 因此打印介质压迫缓冲轴 31， 而缓冲轴 31受 弹性元件 32作用， 将打印介质适度张紧。 当双面打印机接收到打印任务后， 两个打印组件开始打印， 在打印过程中位于两 个打印组件的之间打印介质可能会由于两个打印头下方的打印介质输送不同步而出现 松弛或者过紧现象。 如果位于上游的第二打印头下方的打印介质在启动时输送速度大于位于下游的第 一打印头下方的打印介质在启动时输送速度， 那么在两个打印组件之间的打印介质堆 积， 出现打印介质松弛现象， 此时设置在两个打印组件之间的缓冲轴 31 受弹性元件 32作用， 向偏离打印介质输送通道方向移动， 使松弛的打印介质适度张紧， 从而避免 了打印介质在两个打印组件之间堆积， 出现塞纸的问题。 如果位于下游的第一打印头下方的打印介质在启动时的输送速度大于位于上游的 第二打印头下方的打印介质在启动时输送速度， 在第二打印组件还没有完成打印时第 一打印组件就会向下游输送打印介质， 导致两个打印组件之间的打印介质张紧， 张紧 的打印介质将压迫缓冲轴 31克服弹性元件 32的弹力， 向靠近打印介质输送通道的方 向移动， 使打印介质被适度地放松， 避免了因两个打印组件之间的打印介质过紧而影 响第二打印组件的打印质量的问题。 在本发明的其他实施例中， 根据结构设计尺寸需要， 还可以将缓冲机构 3设置在 第一框架 10上。 图 4是根据本发明第二实施例的双面打印机的结构示意图， 图 5是根 据本发明第二实施例的双面打印机的打印介质安装示意图。 本实施例与上一实施例相 比不同之处在于， 本实施例中的缓冲机构 3设置在第一框架 10上， 当第一框架 10相 对第二框架 20闭合时， 缓冲机构 3位于第二框架 20的一侧。 具体地， 缓冲轴 31与第一框架 10活动连接， 当第一框架 10相对第二框架 20闭 合时， 缓冲轴 31位于打印介质输送通道与第二框架 20的相同一侧， 沿垂直于打印介 质输送通道方向， 在第一框架 10上设置有第二长槽孔 101， 第二长槽孔 101位于第一 压纸部 12和第二打印头 21之间， 当第一框架 10相对与第二框架 20闭合时， 第二长 槽孔 101位于打印介质输送通道的与第二框架 20相同一侧。 缓冲轴 31与第二长槽孔 101插接配合，可以沿第二长槽孔 101长度方向向偏离打 印介质输送通道的方向移动； 弹性元件 32—端与缓冲轴 31连接， 另一端与第一框架 10连接， 在弹性元件 32的作用下， 缓冲轴 31始终保持偏离打印介质输送通道的运动 趋势。 本实施例中当第一框架 10相对第二框架 20打开时， 缓冲机构 3随第一框架 10 一起打开。 在完成打印介质安装后， 将第一框架 10相对第二框架 20闭合， 此时打印 介质在第一打印头 11与第一压纸部 12的相切点、 第二打印头 21与第二压纸部 22的 相切点两处被压紧， 在缓冲机构 3的缓冲轴 31处， 由于缓冲轴 31位于打印介质输送 通道的与第二框架 20相同的一侧， 因此缓冲轴 31压迫打印介质，在弹性元件 32的作 用下， 缓冲轴 31将打印介质适度张紧。 图 6是根据本发明第三实施例的双面打印机的结构示意图。 本实施例与第一实施 例相比不同之处在于， 本实施例中的第二打印组件为非热敏打印组件， 如针式打印组 件或者喷墨打印组件。 由于第一打印组件和缓冲机构的实施方式与第一实施例相同， 此处不再赘述， 下 面介绍第二打印组件的实施方式。 本实施例中第二打印组件为针式打印组件， 包括针式打印头 23和垫板 24， 以及 输送辊组 25， 其中， 针式打印头 23的打印端面 231与垫板 24相对， 二者之间保持设 定距离， 针式打印头 23可以沿垫板 24长度往返运动， 在针式打印头 23运动过程中， 打印针将覆盖在打印头端面的墨带 （图中未显示） 上的墨汁击打到打印介质上， 从而 形成设定的图像和文字；输送辊组 25用于将位于针式打印头 23和打印垫板 24之间的 打印介质向下游输送。 当针式打印头 23在打印介质上打印当前行时， 输送辊组 25暂停输送， 针式打印 头 23沿打印介质宽度方向往返运动， 完成当前行打印后， 输送机构 25驱动打印介质 沿介质输送方向运动， 以便针式打印头 23进行下一行打印。 如图 6所示，打印介质首先从针式打印组件的针式打印头 23和垫板 24之间穿出， 绕过缓冲机构 3 的缓冲轴 31后， 从热敏打印组件的第一打印头 11和第一压纸部 12 之间穿过， 经出口排出打印机外。 双面打印机在接收到打印任务后， 热敏打印组件和针式打印组件开始打印， 由于 打印介质相对于针式打印头间歇移动， 而相对于热敏打印头连续移动， 因此即使在平 均打印速度相同的情况下， 位于下游的热敏打印组件的打印介质在启动时的输送速度 大于位于上游的针式打印组件的打印介质在启动时的输送速度， 因此， 热敏打印组件 拉拽打印介质， 使两个打印组件之间的打印介质张紧， 此时， 张紧的打印介质压迫位 于两个打印组件之间的缓冲轴 31克服弹性元件 32的弹力， 向靠近打印介质输送通道 方向移动， 使打印介质适度地放松， 从而避免了两个打印组件之间打印介质过紧造成 针式打印组件的打印质量降低的问题。 图 7是根据本发明第四实施例的双面打印机的结构示意图。 本实施例与第三实施 例的不同之处在于， 本实施例中的第一打印组件为非热敏打印组件， 如针式打印组件 或者喷墨打印组件， 第二打印组件为热敏打印组件。 由于热敏打印组件、 非热敏打印组件在上述实施例已经介绍， 此处不再赘述。 在 本实施例中， 非热敏打印组件仍以针式打印组件为例介绍。 双面打印机接收到打印任务后， 针式打印组件和热敏打印组件开始打印， 由于打 印介质相对于针式打印头间歇移动， 而相对于热敏打印头连续移动， 因此在平均打印 速度相同的情况下， 位于下游的针式打印组件的打印介质在启动时的输送速度小于位 于上游的热敏打印组件的打印介质在启动时的输送速度， 因此在两个打印组件之间堆 积打印介质， 即两个打印组件之间的打印介质松弛， 此时， 位于两个打印组件之间的 缓冲轴 31在弹性元件 32的作用下支撑打印介质向偏离打印介质输送通道的方向移动， 使松弛的打印介质被适度张紧， 从而避免了在两个打印组件之间打印介质堆积， 出现 塞纸的问题。 为适应不便于手动拉直打印介质的场合， 本发明还给出了一种双面打印机的送纸 控制方法。 即在执行打印任务前使位于上游的第二打印组件的输送机构静止， 使位于 下游的第一打印组件的输送机构向下游输送设定长度的打印介质， 以使缓冲机构的弹 性元件 32处于适度张紧的状态。 通过在执行打印任务前使第一打印组件的输送机构向下游输送设定长度的打印介 质， 使得位于第一打印组件和第二打印组件之间的打印介质被拉直， 迫使缓冲机构的 弹性元件张紧。 因此， 在打印过程中， 如果位于两打印组件之间的打印介质松弛， 则 弹性元件 32释放的弹性力促使缓冲轴将打印介质适度张紧。从而避免了在两个打印组 件之间打印介质堆积， 出现塞纸的问题。 图 8是根据本发明第五实施例的双面打印机的结构示意图， 图 9是根据本发明第 五实施例的双面打印机的打印介质安装示意图。 如图 8和图 9所示， 本实施例与上述 各实施例区别在于， 缓冲机构还包括邻近第一长槽孔 201并且通过轴 331枢接于第二 框架 20上的凸轮 33， 其中， 在第一框架 10相对于第二框架 20打开时控制凸轮 33与 缓冲轴 31抵压接触、 使缓冲轴 31保持在张紧位置 （如图 9所示）， 并且在第一框架 10相对于第二框架 20闭合后控制凸轮 33偏离缓冲轴 31。 本实施例适合于第一打印组件 1在启动时的打印介质输送速度大于第二打印组件 2 在启动时的打印介质输送速度， 在更换纸卷时纸卷容易转动、 拉不直打印介质而缓 冲轴不能适度张紧打印介质的场合。 需要指出的是， 在上述第一、 第二、 第三、 第四实施例的双面打印机中， 若第一 打印组件在启动时的打印介质输送速度大于第二打印组件在启动时的打印介质输送速 度， 则无需手动拉纸操作。 在本发明的其他实施例中， 打印组件可以为两个或两个以上， 打印类型可以为热 敏打印、 针式打印或者喷墨打印等打印方式中的任意一种， 缓冲机构为一组或一组以 上， 并在每两个打印组件之间设置缓冲机构， 从而避免在两个打印组件之间的打印介 质过紧或松弛的问题。 在本发明的双面打印机中， 缓冲机构结构简单， 占用打印介质输送通道的长度较 小， 使得双面打印机的结构紧凑， 另外， 通过设置缓冲机构， 放宽了对第一打印组件 和第二打印组件的类型的要求和沿打印介质输送方向的排列顺序的要求。 以上所述仅为本发明的优选实施例而已， 并不用于限制本发明， 对于本领域的技 术人员来说， 本发明可以有各种更改和变化。 凡在本发明的精神和原则之内， 所作的 任何修改、 等同替换、 改进等， 均应包含在本发明的保护范围之内。

Claims

权 利 要 求 书
1. 一种双面打印机， 包括在机架上设置的第二打印组件和沿打印介质输送方向位 于所述第二打印组件下游的第一打印组件， 其特征在于， 还包括在所述第一打 印组件和第二打印组件之间设置的缓冲机构， 所述缓冲机构包括：
缓冲轴和弹性元件， 所述缓冲轴的两端支撑在打印介质输送通道两侧的导 向槽中， 所述缓冲轴在所述导向槽中具有偏离所述打印介质输送通道的运动趋 势， 所述弹性元件位于所述缓冲轴的两端， 一端与所述机架连接， 另一端与所 述缓冲轴连接。
2. 根据权利要求 1所述的双面打印机， 其特征在于， 所述机架包括相互铰接的第 一框架和第二框架， 所述第一框架可以相对所述第二框架打开或闭合， 其中， 所述缓冲轴和所述弹性元件共同设置于所述第一框架或所述第二框架上。
3. 根据权利要求 2所述的双面打印机， 其特征在于， 所述缓冲轴设置在所述第二 框架上， 当所述第一框架相对所述第二框架闭合时， 所述缓冲轴位于所述第一 框架的一侧， 并与所述打印介质的表面相接触， 所述弹性元件向所述缓冲轴提 供方向指向所述第一框架一侧的弹性力。
4. 根据权利要求 2所述的双面打印机， 其特征在于， 所述缓冲轴设置在所述第一 框架上， 当所述第一框架相对所述第二框架闭合时， 所述缓冲轴位于所述第二 框架的一侧， 并与所述打印介质的表面相接触， 所述弹性元件向所述缓冲轴提 供方向指向所述第二框架一侧的弹性力。
5. 根据权利要求 1所述的双面打印机， 其特征在于， 所述导向槽的延伸方向垂直 于所述打印介质输送通道。
6. 根据权利要求 2所述的双面打印机， 其特征在于， 所述缓冲机构还包括邻近所 述导向槽设置的凸轮， 其中， 在所述第一框架相对于第二框架打开时所述凸轮 与所述缓冲轴抵压接触、 使所述弹性元件保持张紧状态， 并且在所述第一框架 相对于所述第二框架闭合后所述凸轮偏离所述缓冲轴。
7. 根据权利要求 1所述的双面打印机， 其特征在于， 所述第一打印组件为热敏打 印组件， 所述第二打印组件为针式打印组件或者喷墨打印组件。
8. 根据权利要求 1所述的双面打印机， 其特征在于， 所述第一打印组件为针式打 印组件或者喷墨打印组件， 所述第二打印组件为热敏打印组件。
9. 一种根据权利要求 1至 8中任一项所述的双面打印机的送纸控制方法， 其特征 在于， 包括：
在执行打印任务前控制位于上游的第二打印组件的输送机构静止， 控制位 于下游的第一打印组件的输送机构向下游输送设定长度的打印介质。
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JP5723909B2 (ja) * 2013-03-05 2015-05-27 東芝テック株式会社 両面プリンタ装置
CN111362038A (zh) * 2018-12-26 2020-07-03 上海梅山钢铁股份有限公司 一种大卷径微型针式打印机
CN114104617B (zh) * 2021-12-15 2023-03-24 泰州市名诚链传动有限公司 一种工业链条加工制造用定长限位张紧设备

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