CN104553312B - Ink-jet printer - Google Patents

Abstract

The present invention provides an inkjet printer, which includes a medium moving platform for printing media to pass through, opposite to the first side wall and the second side wall arranged on both sides of the medium moving platform, and also includes: The rotating shaft on the wall and the second side wall, the side of the rotating shaft between the first side wall and the second side wall protrudes to form a cylindrical contact section that can contact the moving medium below; the first side wall is away from the contact section An encoder is fixedly installed on one side of the shaft, and the central shaft of the encoder is coaxially fixedly connected with one end of the rotating shaft. The inkjet printer provided by the present invention realizes the reliable collection of the displacement of the printing medium, and at the same time significantly increases the contact area between the rotating shaft and the printing medium, reduces the wear caused by the printing medium on the rotating shaft, and increases the service life; in addition, it is convenient to operate and easier to ensure Install concentricity.

Description

Inkjet Printers

technical field

The invention relates to image forming technology, in particular to an inkjet printer.

Background technique

Inkjet printers use the inkjet printing head to spray ink from the nozzle of the printing head to the medium (such as paper) at a certain speed to form an image, and usually use the method of fixing the printing head and moving the medium to complete the entire image Printing; specifically, the nozzles of the inkjet print head cover the entire printing width, and the ink jet of the print head can form one line of images at a time. After one line is printed, the medium moves to the printing position of the next line, and the printing of all images is completed in this cycle. In the above-mentioned inkjet printing process, the inkjet work of the print head needs to be consistent with the movement of the medium. In the prior art, the encoder is generally used as a measuring tool to determine the distance moved by the medium, and according to the output pulse of the encoder Time to control the time when the print head ejects ink.

Fig. 1 is a schematic structural view of a signal acquisition device in the prior art; Fig. 2 is a top view of Fig. 1; The center of the wheel 12 is relatively fixed to the central axis of the encoder to ensure that the pressure wheel and the central axis of the encoder rotate at the same time; the bracket 11 is installed on a side wall of the printer through the installation shaft 14, and the encoder 13 is also fixedly connected with a mounting plate 15 , the other end of the mounting plate 15 is sheathed on the mounting shaft 14 to adjust the position of the encoder 13 and the pressure wheel 12 relative to the plane. The above-mentioned signal acquisition device can be installed on the side wall of the inkjet printer, wherein the pinch wheel 12 can be located above the medium moving channel, so as to drive the pinch wheel 12 to rotate when the medium moves, and the encoder rotates at the same time, and then the displacement of the pinch wheel is as follows: The form of the pulse signal is fed back to the inkjet control system for it to determine the time of inkjet accordingly.

Because the pressure wheel of this signal acquisition device in the prior art generally has a small thickness, the contact area between it and paper and other media is small, the contact stress is large, and the surface of the pressure wheel is easy to wear, thereby affecting the accuracy of signal acquisition. , and the service life is reduced; in addition, the installation of the existing structure is complicated, and the installation coaxiality is not easy to guarantee.

Contents of the invention

In view of the above-mentioned defects in the prior art, the present invention provides an inkjet printer, which realizes the acquisition of the displacement of the printing medium through the encoder, increases the service life, and facilitates assembly.

The present invention provides an inkjet printer, which includes a medium moving platform for printing media to pass through, and a first side wall and a second side wall oppositely arranged on both sides of the medium moving platform, and further includes: The rotating shaft on the first side wall and the second side wall, the side of the rotating shaft between the first side wall and the second side wall protrudes outward to form a cylindrical contact section capable of contacting the moving medium below; An encoder is fixedly installed on the side of the first side wall away from the contact section, and the central axis of the encoder is fixedly connected coaxially with one end of the rotating shaft.

The inkjet printer provided by the present invention can reliably collect the displacement of the printing medium through the rotating shaft that runs through the first side wall and the second side wall of the printer and can be in contact with the printing medium, and at the same time significantly increases the contact area between the rotating shaft and the printing medium. The contact stress is reduced, thereby reducing the wear caused by the printing medium on the rotating shaft and increasing the service life; in addition, when installing the rotating shaft for signal acquisition, it is easier to ensure the installation coaxiality and the operation is more convenient.

Description of drawings

Fig. 1 is a schematic structural diagram of a signal acquisition device in the prior art;

Fig. 2 is the top view of Fig. 1;

Fig. 3 is a partial structural schematic diagram of an embodiment of the inkjet printer of the present invention;

FIG. 4 is a schematic structural diagram of the encoder mounting seat in FIG. 3 .

detailed description

Embodiment one

Fig. 3 is a partial structural diagram of an embodiment of the inkjet printer of the present invention; please refer to Fig. 3, the present embodiment provides an inkjet printer, which includes a medium moving platform for printing media to pass through, and is relatively arranged on both sides of the medium moving platform. The first side wall 201 and the second side wall 202 on the side; also include: the rotating shaft 3 rotatably passing through the first side wall 201 and the second side wall 202, located on the first side wall 201 and the second side wall The sides of the rotating shaft 3 between 202 protrude to form a cylindrical contact section 31 that can be in contact with the moving medium below; The shaft is fixedly connected with one end of the rotating shaft 3 coaxially.

Specifically, the inkjet printer may include a casing and a medium moving platform, and a medium driving unit, a print head, and a printing control unit for driving the printing medium to move may also be arranged in the casing; the casing has a first side wall 201 oppositely arranged and the second side wall 202 , the medium moving platform is disposed between the first side wall 201 and the bottom of the second side wall 202 . Wherein, the extension directions of the first side wall 201 and the second side wall 202 are parallel, and the extension direction is the moving direction of the printing medium; the printing medium, such as paper, can be placed on the medium moving platform.

The medium driving unit can be a structure commonly used in the printer field, so that the printing medium can be driven by the medium driving unit to move on the printing platform in a direction perpendicular to the rotating shaft 3, and the rotating shaft 3 can pass through the first side wall 201 and the second side wall 202. Supported above the medium moving platform, and the part of the rotating shaft 3 between the first side wall 201 and the second side wall 202 forms a cylindrical contact section 31, the diameter of the contact section 31 is larger than other positions of the rotating shaft 3, so that the contact section The side of 31 can be in contact with the surface of the printing medium on the printing platform, so that when the printing medium moves, the rotating shaft 3 can be driven to rotate by friction; in addition, the length of the contact section 31 can be equal to or greater than the width of the printing medium.

The encoder 4 can be installed on the side of the first side wall 201 away from the contact section 31, that is, one side of the first side wall 201 is the encoder 4, the other side is the contact section 31 and the second side wall 202; The one side wall and the second side wall are only relative, and the relative positions of the first side wall 201 and the second side wall 202 can be interchanged.

In this embodiment, when the encoder 4 is installed on the first side wall, the outer shell of the encoder 4 can be directly installed on the outer surface of the first side wall 201 through bolts (of course, it can also be installed with the aid of installation aids). On the first side wall 201, the following embodiments will be described in detail), it is only necessary to ensure that the housing of the encoder 4 is firmly fixed to the first side wall 201, and the central shaft 41 protruding from the encoder 4 passes through the rotating shaft 3 One end of the first side wall 201 is coaxially fixed to ensure that the central axis 41 of the encoder 4 and the rotating shaft 3 have the same motion state.

On the first side wall 201 and the second side wall 202, installation through holes for installing the rotating shaft 3 can be provided respectively. Two installation through holes, to ensure the coaxiality of the two installation through holes; and, the two ends of the rotating shaft 3 can be supported on the first side wall 201 and the second side wall 202 through the first bearing 301 and the second bearing 302 respectively. installed in the through hole, to reduce the frictional force between the rotating shaft 3 and the first side wall and the second side wall, and ensure the smooth rotation of the rotating shaft 3; The ring 504 prevents the first bearing 301 and the second bearing 302 from moving axially, so that the shaft 3 can be axially positioned through the first bearing 301 and the second bearing 302 . In this embodiment, the first bearing 301 and the second bearing 302 may be deep groove ball bearings.

When the inkjet printer provided in this embodiment is working, the printing medium moves on the printing platform, between the first side wall 201 and the second side wall 202, along a direction perpendicular to the rotating shaft 3, because the contact section 31 on the rotating shaft 3 Contact with the surface of the printing medium, under the friction of the printing medium to the contact end 31, the rotating shaft 3 rotates around its central axis, and at the same time, the central axis 41 of the encoder fixed to the rotating shaft 3 also rotates together, and the encoder 4 can rotate The number of turns of the rotating shaft 3 is output to the printing control unit in the form of a pulse signal, so that the printing control unit can obtain the displacement of the printing medium and determine the ink ejection moment of the printing head according to the number of turns of the rotating shaft 3 .

The inkjet printer provided in this embodiment, through the rotating shaft passing through the first side wall and the second side wall of the printer, can reliably use the encoder to transmit the displacement information of the printing medium in real time, and can also significantly increase the distance between the rotating shaft and the printing medium. The contact area reduces the contact stress, thereby reducing the wear caused by the printing medium to the rotating shaft and increasing the service life; in addition, during assembly, only two coaxial Install the through hole, and then pass the rotating shaft to the installation through hole, which ensures the coaxiality of the installation and facilitates the operation process.

Embodiment two

The difference between this embodiment and Embodiment 1 is that in this embodiment, the encoder 3 is fixedly installed on the first side wall through the encoder mounting base. As shown in FIG. 3 and FIG. 4 , the inkjet printer provided in this embodiment further includes: an encoder mount 5 , and the encoder 4 is fixed on the first side wall 201 through the encoder mount 5 .

Specifically, the encoder mount 5 can be a hollow column, such as a cylinder, and an opening can also be formed on the side wall to reduce its own weight; one end of the encoder mount 5 is screwed to the On the side wall 201 , the other end of the encoder mounting base 5 is detachably provided with an end cover 52 , and the encoder 4 is screwed to the end cover 52 through a second fastener 502 . Wherein, one end of the encoder mounting seat 5 facing the first side wall 201 can be formed with a mounting flange, and is screwed on the first side wall 201 by a first fastener passing through the mounting flange; One end of the side wall 201 can be provided with an opening, and the end cover 5 can be a plate shape matching the opening, and the second fastener 502 can be used to pass through the end cover 5 in the axial direction and be screwed on the encoder mounting base 5 . On the side wall; and the end cover 5 can also be provided with a through hole, so that the central shaft 41 of the encoder 4 can pass through the end cover and extend into the encoder mounting seat 5, and pass through one end of the rotating shaft 3 in the encoder mounting seat 5 The coupling is fixedly connected. The first fastener 501 and the second fastener 502 in this embodiment can be bolts, screws, etc., which can be easily installed and disassembled.

Further, one end surface of the encoder mounting base 5 protrudes outward to form a mounting sleeve 503, and the mounting sleeve 503 penetrates the mounting through hole on the first side wall 201, that is, the outer diameter of the mounting sleeve 503 is smaller than that of the encoder mounting base. Other positions, so that the installation sleeve 503 extends into the installation through hole, the first bearing 301 and the installation sleeve 503 are at the two ends of the same installation through hole, and the first bearing 301 is screwed toward the side of the second side wall 202 A retaining ring 504 is fixed, and the mounting sleeve 503 is located on the other side of the first bearing 301 and abuts against the first bearing 301 to further enhance the axial positioning of the encoder mounting base 5 .

Furthermore, the medium moving platform can extend in a rectangular shape, and its width can match the width of the medium to be printed, and the axial length of the contact portion 31 can be greater than or equal to half of the medium moving platform, and less than the first side wall 201 and The distance between the second side walls 202 .

Preferably, the outer surface of the contact portion 31 of the rotating shaft 3 can be formed with a wear-resistant layer; that is, a layer of wear-resistant material such as rubber can be coated on the outer surface of the contact portion 31 to improve the wear resistance; The surface of the wear-resistant layer is processed with grooves or grids, etc., to increase the friction between the contact portion 31 and the printing medium, to ensure that the printing medium can reliably drive the rotating shaft 3 to rotate, thereby ensuring that the encoder 4 and the rotating shaft 3 Synchronous work ensures that the printing control unit can accurately determine the ink jetting time, thereby ensuring the printing effect.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention. scope.

Claims (7)

1. an ink-jet printer, including the medium mobile platform passed through for print media, and it is oppositely arranged on the first side wall and second sidewall of described medium mobile platform both sides, it is characterized in that, also including: be rotatably arranged in the rotating shaft on described the first side wall and the second sidewall, the rotating shaft side evagination between described the first side wall and the second sidewall forms contact-segment columned, that can contact with the move media of lower section；Described the first side wall deviates from the side of described contact-segment and is installed with encoder, and one end of the central shaft of described encoder and described rotating shaft is fixedly and coaxially connected；

Also include: clutch shaft bearing and the second bearing, described rotating shaft two ends respectively through described clutch shaft bearing and the second bearings in the installation through hole of described the first side wall and the second sidewall；

Also including encoder mounting seat, described encoder is fixed on described the first side wall by described encoder mounting seat.

2. ink-jet printer according to claim 1, it is characterized in that, described encoder mounting seat is column, one end of described encoder mounting seat is screwed onto on described the first side wall by the first securing member, the other end of described encoder mounting seat is detachably provided with end cap, and described encoder is screwed onto on described end cap by the second securing member.

3. ink-jet printer according to claim 2, it is characterised in that on one end end face of described encoder mounting seat, evagination is formed and installs sleeve, and described installation sleeve penetrates the installation through hole on described the first side wall and supports on described clutch shaft bearing.

4., according to the arbitrary described ink-jet printer of claim 1-3, it is respectively equipped with, in described rotating shaft and outside described clutch shaft bearing and the second bearing, the back-up ring preventing bearing axial float；Described encoder mounting seat is cylindrical, and is formed with opening on sidewall.

5. according to the arbitrary described ink-jet printer of claim 1-3, it is characterised in that the bearing of trend of described rotating shaft is parallel to the surface of described medium mobile platform and the moving direction extending perpendicularly to print media of described rotating shaft.

6. ink-jet printer according to claim 5, it is characterised in that the axial length of described contact-segment is more than or equal to the half of described medium mobile platform width and less than the distance between described the first side wall and the second sidewall.

7. according to the arbitrary described ink-jet printer of claim 1-3, it is characterised in that the outer surface of described contact-segment is formed with wearing layer.