Print system
Technical field
The present invention relates to a kind of print system, particularly relate to a kind of print system of guaranteeing the print quality that full version is printed.
Background technology
Along with development of science and technology, various electronic and electrical equipments become in the daily life indispensable instrument.For instance, machine commonly used has just comprised computer, printer, facsimile machine, duplicator or the like in office.And for printer, the quality that is not limited only to printing, the speed pursued, the product of some multi-functional surcharges emerges in an endless stream, as scan function, phase tablet quality printing function etc., in the problem of photo printing, the photograph that full version is printed can allow especially and use the visual enjoyment that obtains another kind of level, at home from the photograph of line printing also as the professional grade of photo studio made.So printing, full version promptly becomes present commercially available printer important pointer relatively, and be to reach the function that full version is printed, general commercially available printer do not stint increase machine cost or utilize the paper bigger to print than required print paper after, cut, cut and reach the effect that full version is printed.
See also Fig. 1 and Fig. 2, Fig. 1 and Fig. 2 are the printing schematic diagram of an existing printer 10.Printer 10 comprises a paper feeding roller 12, one paper placing slots 14, paper feed wheel 16, one paper feed pressure wheel 18, a paper output wheel 20, delegation's (row) paper delivery pressure wheel 22, a printing platform 24, and a printhead 26.Shown in figure one, one paper 28 pushes on the print platform 24 according to a direction of rotation 30 from paper placing slot 14 by paper feeding roller 12, to carry out the print job of image or literal, wherein paper feed pressure wheel 18 provides a suitable clamping strength F with paper feed wheel 16, and according to a direction of rotation 32, carry out paper 28 and present accurately, and make print area keep smooth to control good print quality.As shown in Figure 2, when printhead 26 print papers 28 near paper 28 when terminal, the a bit of quality that can't guarantee its printing apart from d is arranged, this is the distance of the last print point 50 of printhead to the bite 51 of paper feed wheel 16 and paper feed pressure wheel 18 apart from d, because when paper feed wheel 16 and paper feed pressure wheel 18 after bite 51 discharges paper 28, the moving situation of paper 28 is promptly controlled by paper output wheel 20 fully, therefore the paper of paper output wheel 20 after will printing taken out of the function of print zone, print paper 28 (paper 28 leaves bite 51 backs) when least significant end is also arranged, control the function that accurately moves of paper, precision is bad promptly may to cause print quality landing significantly if control.Generally speaking, commercially available printer collocation paper output wheel 20 and paper delivery pressure wheel 22, but because the weight factor of paper, after paper 28 ends leave bite 51, the paper end is promptly carried in the meeting, sees also Fig. 3, the schematic diagram that Fig. 3 carries on a print zone L for existing paper 28 ends.This moment is not if the least significant end of paper 28 is if print work, then paper 28 is promptly taken it out of printer 10 by paper output wheel 20 and is got final product, otherwise,, print as carrying out full version if will continue to print, because paper 28 ends leave on bite 51 backs and carry, so print quality promptly may be because of in the print zone L, the distance h 1 of printhead 26 and paper 28, h2 heterogeneity and instability, it must cause the bad consequence of print quality, even the serious consequence that may cause printhead to hit paper or drag China ink.
See also Fig. 4, Fig. 4 is the schematic diagram of first solution of existing printer 10.For carrying on anti-these print paper 28 ends, it promptly utilizes the quality second paper delivery pressure wheel 221 to impose the strength P of smooth paper end again, and guaranteeing in the print zone L, the distance h homogeneous of printhead 26 and paper 28 and stable is to keep print quality.But this not only increases the cost of the second paper delivery pressure wheel 221, the possibility that also empty supercharging wheels damages for paper surface.
See also Fig. 5, Fig. 5 is the schematic diagram of second solution of existing printer 10.Its rear side at paper output wheel 20 increases by one second paper output wheel 201 again, and height is a little more than paper output wheel 20, the height that this increased is the paper 28 that makes after the printing and can raises up, thereby paper 28 must develop print platform 24 at print zone L, also be in order to make paper 28 smooth in print zone L, and keep the distance h homogeneous of printhead 26 and paper 28 and stable, to keep print quality.But this kind practice not only increases the cost of second paper output wheel 201, also may cause the pedestal (foot-print) of board to increase, thereby increase the problem that board is oversize and cost is higher.
Summary of the invention
The present invention relates to a kind of print system of guaranteeing the print quality that full version is printed, to solve the above problems.
The present invention has disclosed a kind of print system, include one and print platform, be used for supporting the recording medium in the printing, one paper output wheel, first side and its top that are arranged at this print platform with rotary way are to be higher than this print platform, be used for the recording medium band after printing from a print zone, an and paper delivery pressure wheel, be used to provide a pressure to this recording medium, the center of this paper delivery pressure wheel in horizontal direction between the center and this print zone of this paper output wheel, and the center that is higher than this paper output wheel, the bottom of this paper delivery pressure wheel is the top that is lower than this paper output wheel, and is higher than this print platform.
Description of drawings
Fig. 1 and Fig. 2 are the printing schematic diagram of existing printer;
The schematic diagram that Fig. 3 carries on print zone for existing paper end;
Fig. 4 is the schematic diagram of first solution of existing printer;
Fig. 5 is the schematic diagram of second solution of existing printer;
Fig. 6 is the printing schematic diagram of print system of the present invention.
The specific embodiment
See also Fig. 6, Fig. 6 is the printing schematic diagram of the present invention one printing system 110.Print system 110 can be one complete edition print system.Print system 110 comprises a paper feeding roller 112, one paper placing slots 114, paper feed wheel 116, one paper feed pressure wheel 118, a paper output wheel 120, quality paper delivery pressure wheel 122, a printing platform 124, and a printhead 126.As shown in Figure 6, one recording medium 128 pushes on the print platform 124 according to a direction of rotation 130 from paper placing slot 114 by paper feeding roller 112, to carry out the print job of image or literal, wherein paper feed pressure wheel 118 provides a suitable clamping strength F with paper feed wheel 116, and according to a direction of rotation 132, carry out recording medium 128 and accurately present, and make print area keep smooth to control good print quality.And recording medium 128 can be a paper.
Do a detailed description in this each relative positions and function to printer 100.Paper output wheel 120 is to be higher than print platform 124 with first side and its top that rotary way is arranged at print platform 124, and wherein the contact-making surface of paper output wheel 120 and recording medium 128 is higher than print platform 124 1 distance Y, and paper output wheel 120 is used for 128 bands of the recording medium after printing from a print zone L.And paper delivery pressure wheel 122 is used to provide a strength Q to recording medium 128, strength Q can produce by a pressure generator 119, export paper delivery pressure wheel 122 again to, and pressure generator 119 can be a flexible member, be used to provide balanced strength to paper delivery pressure wheel 122; The center of paper delivery pressure wheel 122 is between the center and print zone L of paper output wheel 120 in horizontal direction, and the center that is higher than paper output wheel 120, and the bottom of paper delivery pressure wheel 122 is lower than the top of paper output wheel 120, and be higher than print platform 124, that is to say that the paper delivery pressure wheel 122 and the contact-making surface of recording medium 128 are higher than print platform 124, the center of wherein paper delivery pressure wheel 122 and the center of paper output wheel 120 are in the horizontal direction distance X of being separated by.
And paper placing slot 114 is used for putting not and accepts the recording medium 128 printed, and 112 of paper feeding rollers are arranged at paper placing slot 114 tops with rotary way, and it can be rotated so that recording medium 128 is pushed to print platform 124 by paper placing slot 114 in direction of rotation 130.Paper feed wheel 116 and paper feed pressure wheel 118 then are arranged at second side of print platform 124, are used for accepting clamping recording medium 128 in the print procedure in recording medium 128, to present recording medium 128 to paper output wheel 120 and paper delivery pressure wheel 122.
And the strength Q of paper delivery pressure wheel 122 recording medium of granting 128 can produce with a clockwise moment T1 (T1=Q*X) recording medium 128, when counter clockwise direction moment T2 that this moment T1 is caused recording medium 128 greater than recording medium 128 weight w, because the effect of recording medium 128 rigidity own, can guarantee that recording medium 128 keeps smooth in print platform 124, and this moment, print platform 124 promptly can be granted a uniform distributed force R in the printing reverse side of recording medium 128, and then guarantee the distance h homogeneous of printhead 126 and recording medium 128 and stable, to keep print quality, and recording medium 128 also can be bound on the print platform 124 with being flattened, and then is convenient to paper output wheel 120 and drives recording medium 128 smooth-goingly.That is to say viewpoint with recording medium 128 equalising torques own, if the center with paper output wheel 120 is a fulcrum, the clockwise moment T1 that strength Q produced of paper delivery pressure wheel 122 can equal the counter clockwise direction moment T2 that the weight w of recording medium 128 causes and add the print platform 124 counter clockwise direction moment T3 that uniform distributed force R is produced that grants, be T1=T2+T3, and reach the transient equilibrium of recording medium 128.
Therefore in the present invention, the horizontal range x of paper delivery pressure wheel 122 and paper output wheel 120, the contact-making surface of paper output wheel 120 and recording medium 128 is higher than the distance Y of print platform 124, and the platen strength Q of paper delivery pressure wheel 122, and promptly invention reaches the important parameter that full version is printed for this reason.Can draw with the actual experiment data, common photograph paper with general A4 size, its weight only is about 11~16g, if with paper output wheel 120 external diameter 12mm, and paper delivery pressure wheel 122 external diameter 10mm are example, usually Y is that 1~2mm is preferable parameter combinations to X with 4~5mm, i.e. paper delivery pressure wheel 122 is about 20 °~45 ° with the line of centres and the vertical plane angle theta of paper output wheel 120.
And main feature of the present invention is to utilize existing type element, through each interelement relative position suitably is set, keeps homogeneous and stable and can reach printhead 126 with the distance h of recording medium 128 in print zone L, to keep print quality.This is because the contact-making surface of paper output wheel 120 and recording medium 128 is higher than the paper output wheel 120 raising effects that print platform 124 is caused, and the center of paper delivery pressure wheel 122 in horizontal direction between the center of paper output wheel 120 and print zone L the misalignment effects of the paper delivery pressure wheel that causes 122 and paper output wheel 120, and can provide a couple (couple) in recording medium 128 in good time, add the strength Q that suitably adjusts letterweight wheels 122 recording medium of granting 128, recording medium 128 keeps smooth equalising torque effect in print zone L and reach as mentioned above.Therefore print system of the present invention need not additionally be set up and be put other type element, just can reach printhead 126 and keep homogeneous and stable effect with the distance of recording medium 128 in print zone L.The bottom of paper delivery pressure wheel in addition 122 need be higher than print platform 124, is lower than print platform 124 to avoid the paper delivery pressure wheel 122 and the contact-making surface of recording medium 128, and the situation generation that causes recording medium 128 in print zone L, to tilt upward bent.
And paper delivery pressure wheel 122 of the present invention can be a roller that does not attach the record element that is printed to recording medium 128, paper delivery pressure wheel thus 122 is when applying strength Q to recording medium 128, just can not attach this record element, so that influence print quality, wherein this record element can be ink or carbon dust.
Be compared to existing print system, print system of the present invention need not additionally to set up puts other type element, just printhead and the recording medium distance in print zone be can reach and homogeneous and stable effect kept, just can guarantee the print quality of end of medium when full version is printed thus, even can save the cost that traditional paper is printed, promptly can be not good because of the print quality of the end of medium, and sacrifice the printing in this section zone.Also because recording medium can be restrained on print platform with being flattened, and then can be convenient to paper output wheel and drive the recording medium paper delivery smooth-goingly in addition, and the probability that reduces paperboard takes place.
The above only is preferred embodiment of the present invention, and all equalizations of doing according to claim of the present invention change and modify, and all should belong to the covering scope of patent of the present invention.