JP6152813B2 - Printing device - Google Patents

Description

The present invention relates to a printing apparatus.

  Conventionally, for example, for a product displayed on a sales floor such as a convenience store, a supermarket, a department store, etc., the product name, place of production, expiration date, unit price, etc., which the store clerk has peeled from the release paper one by one are printed in advance. A label with glue is attached.

  For the production of such a label, printing apparatuses such as letterpress printing, intaglio printing, offset printing, and screen printing are used for large-sized labels. In either case, a wide, large sheet of paper, or a paper roll that is made of a wide roll-shaped recording medium, and a label base paper with backing paste on top of it is used as a source of printed material. To print.

  The printed base paper for which printing has been completed is provided with slits in the shape of the label of the final product on the label base paper (notches on the base of the release paper, but not only on the label base paper). Furthermore, although the cost is somewhat high, there is a case where the sheet is lifted (an operation for peeling off and removing unnecessary portions of the label base paper around the label).

  After that, it is further cut as a final product of a predetermined size with a plurality of labels as a set, and this is shipped to the retail market as a label with release paper.

  By the way, a small-sized label producing apparatus that is large enough to be put on both hands that can be used by individuals or offices has been put into practical use. These are called by various names, such as a label printer, a label writer, and a tape printer, but a printing system using a heat generating head and a thermal ink tape is generally used.

  In general, these small-sized label producing apparatuses are those in which a label base paper with a back paste is overlapped on a tape-like release paper having a width of about 1 cm even from a 1 cm width, wound around a reel shaft, and stored in a tape cassette. It is designed to be attached to the device body.

  Then, print the letters and marks on the label base paper with release paper and back paste drawn from the tape cassette using a heating head and thermal ink tape, cut it to the desired length, and use the release paper that can be used immediately A label with back glue can be obtained.

  By the way, in recent years, there is a demand for a small-scale label printing system that is not large-sized but small-sized so that it can cope with a small quantity and a variety of products and on-demand. In order to cope with such a small-scale label printing system, it is conceivable to use an ink jet printing apparatus or an electrophotographic image forming apparatus for the printing unit, and a roll-shaped recording medium for the printed material.

  When a roll-shaped recording medium is used as a printed material resource, generally, an unwinding unit that feeds the roll-shaped recording medium to a printing unit, and a winding unit that winds up the roll-shaped recording medium that has been printed by the printing unit. It is necessary to prepare. For a roll-shaped recording medium having an unwinding portion and a winding portion, a winder facility including a sheet breakage detection device has been proposed. (For example, refer to Patent Document 1.)

JP 2000-086035 A

  However, the winder facility described in Patent Document 1 is an extremely large-scale facility, and this winder facility is combined with an inkjet printing apparatus or an electrophotographic image forming apparatus of a printing unit as a recording medium supply apparatus for a small-scale label printing system. However, there is a problem that the installation area of the entire system becomes too large.

  Further, as a standard roll-shaped recording medium, there is a recording medium with a core tube in which the dimension in the longitudinal direction of A3 size paper is a roll width and a paper tube is a core tube. This recording medium has a diameter of about 30 cm and a maximum weight of about 30 kg. This is a significant weight.

  On the other hand, the roll-shaped recording medium is fed to the printing apparatus of the label printing system from the side or the bottom of the printing apparatus because of the printing mechanism in the printing apparatus. On the other hand, the discharge of the printed roll-shaped recording medium in the printing apparatus is also discharged sideways or above due to the printing mechanism in the printing apparatus.

  Therefore, it is necessary to arrange the unwinding part of the roll-shaped recording medium beside or below the printing apparatus and the winding part beside or above the printing apparatus. In order to reduce the installation area of the system, it is ideal to install the unwinding unit and the winding unit in a three-dimensional manner in the vertical direction, rather than installing them in a horizontal direction across the printing device. is there.

  However, the arrangement of the three-dimensional configuration in which the unwinding unit is disposed below the printing device and the winding unit is disposed on the printing device is dangerous because the system becomes too tall. As a second best measure, a semi-planar and semi-three-dimensional configuration in which the unwinding part is arranged under the printing apparatus and the winding part is arranged beside the printing apparatus can be considered.

  By the way, the structure which arrange | positions an unwinding part under a printing apparatus as mentioned above is arrange | positioning a printing apparatus on an unwinding part, if it changes a view. That is, the printing apparatus is arranged at a position higher than usual. And the structure which arrange | positions a winding part beside a printing apparatus arrange | positions a winding part in a high position along with a printing apparatus.

  That is, there is a possibility that problems such as dropping of the roll-shaped recording medium may occur in the operation of taking out the roll-shaped recording medium that has been printed from the winding unit at a high position. Since the roll-shaped recording medium has a considerable weight, there is a problem that the work of taking out the roll paper from the winding unit is dangerous and difficult.

An object of the present invention is to provide a small and convenient printing apparatus that can safely and easily take out a recording medium wound up after printing from a mounting portion.

In order to solve the above-described problems, a printing apparatus according to the present invention includes an unwinding unit that rotatably holds a first core tube around which a recording medium is wound , and the recording medium that is sent from the unwinding unit. A printing unit that performs printing on the recording medium, a winding unit that rotatably holds a second core tube that fixes a starting end of the recording medium discharged from the printing unit and winds up the recording medium discharged, and When the recording medium wound up by the winding unit is rewound to the winding unit, the winding unit is rotated in a direction opposite to the rotation direction of the winding unit when the recording medium is wound by the winding unit. A control unit that rotates and rewinds the printing unit, wherein the printing unit discharges the printed portion of the recording medium in a face-down state, and the winding unit discharges the recording medium that has been discharged. The printed part is wound up face down, and the unwinding part From unwinding in a state of face-up, characterized in that.

ADVANTAGE OF THE INVENTION According to this invention , the small and convenient printing apparatus which can take out the recording medium wound up after printing safely and easily from a mounting part can be provided.

(a) is an external appearance perspective view which shows the printing unit which comprises the printing part in the printing apparatus which concerns on Example 1 of this invention, (b) is sectional drawing which shows the internal structure. (a) is the perspective view which shows the printing apparatus which concerns on Example 1 with a detachable consumable, (b) is the top view, (c) is a front direction from the unwinding unit attachment part shown by hatching under the front of (a) It is a top view of the unwinding unit pulled out. (a) is a perspective view showing a printing apparatus in a state in which the recording medium is set in the printing apparatus for printing on a roll-shaped recording medium in the printing apparatus according to the first embodiment, and (b) is a cross-sectional view thereof. (a) is the figure which shows the state which printing to the roll-shaped recording medium advanced to the final stage in the printing apparatus which concerns on Example 1, and the rear-end part of the recording medium removed from the core tube of the unwinding part, (b) FIG. 4 is a diagram showing a state in which a recording medium that has been printed is wound up on a winding unit. FIG. 2A is a cross-sectional view showing a printing apparatus in a state where a roll-shaped recording medium that has been printed is rewound, and FIG. (a) A cross-sectional view showing a printing apparatus in a state where a roll body that has been unwound from a winding section of a printed roll body is held in an unwinding section, and (b) is an external perspective view thereof. (a) is a diagram showing another example of the rewind rotation direction, (b) is a diagram showing a method for setting the conveyance path of the recording medium to be pulled out from the roll body mounted on the unwinding portion in the case of the additional printing .

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[Example 1]

  FIG. 1A is an external perspective view showing a printing unit constituting a printing unit in a printing apparatus according to Embodiment 1 of the present invention, and FIG. 1B is a cross-sectional view showing the internal configuration thereof. A printing unit 1 shown in FIGS. 1A and 1B is a desktop image forming apparatus that can be used alone as a page printer for printing on a sheet.

  The printing unit 1 is an electrophotographic secondary transfer tandem color image forming apparatus, and includes an image forming unit 2, a transfer belt unit 3, a toner supply unit 4, a paper feeding unit 5, and a belt type fixing unit. 6 and a transport unit 7 for double-sided printing.

  The image forming unit 2 is in contact with the lower running surface 8a of the transfer belt 8 of the transfer belt unit 3 and has four developing devices 9 (9k, 9c, 9m, 9y) arranged in a multistage manner from right to left in FIG. Configured. The image forming unit 2 is held by the frame of the main body of the printing unit 1 so as to be movable up and down from the printing execution position shown in FIG. 1B to a maintenance position below it.

  Of the four developing devices 9, three developing devices 9c, 9m, and 9y on the upstream side (the left side in the figure) are cyan (C), magenta (M), and yellow (Y), which are subtractive three primary colors, respectively. A mono-color image is formed with the color toner, and the developing device 9k forms a monochrome image mainly with black (K) toner used for characters and dark portions of the image.

  Each of the developing devices 9 has the same configuration except for the color of the toner that develops the image. Therefore, the configuration of the developing device 9y for yellow (Y) toner will be described below as an example.

  The developing device 9 includes a photosensitive drum 10 at the top. The photosensitive drum 10 has a peripheral surface made of, for example, an organic photoconductive material. A cleaner 11, a charging roller 12, an optical writing head 13, and a developing roller 15 of the developing device 14 are disposed in contact with or around the periphery of the photosensitive drum 10.

  The developing device 14 is divided into two upper and lower developing tanks by a partition wall inside a housing that covers the outside. The upper developing tank is provided with the developing roller 15 and the developing toner stirring and conveying screw, and the lower developing tank is provided with a replenishing toner stirring and conveying screw and a toner density sensor.

  The developing unit 14 includes a toner cartridge 16 of the toner supply unit 4 disposed above the transfer belt unit 3, and black (K), cyan (C), K, C, M, and Y shown in FIG. Either magenta (M) or yellow (Y) toner is supplied via the supply path 17.

  The replenishment path 17 is made of a pipe member, and is connected to a lower developing tank in which a replenishing toner stirring and conveying screw of the developing device 14 is disposed so as to go around the rear side of the transfer belt unit 3 (the side facing the depth direction of the paper surface). Has been.

  The transfer belt unit 3 has an endless transfer belt 8 that extends in the shape of a flat loop in the left-right direction in the figure at approximately the center of the main unit, and the transfer belt 8 is stretched over the transfer belt 8. A driving roller 18 and a driven roller 19 are provided to circulate and move counterclockwise as indicated by an arrow b in the figure.

  A secondary transfer roller 21 is pressed against the driving roller 18 via the transfer belt 8, and the primary transfer toner image on the transfer belt 8 is secondarily transferred to a sheet as a transfer medium conveyed here. The next transfer portion is formed.

  The transfer belt 8 includes a primary transfer roller 22 integrated with the unit. The primary transfer roller 22 is disposed so as to sandwich the transfer belt 8 at a position slightly shifted from the photosensitive drum 10.

  The primary transfer roller 22 directly transfers (primary transfer) the toner image to the lower running surface 3 of the transfer belt 8 that circulates downward. The transfer belt 8 conveys the toner image to the secondary transfer unit in order to further transfer (secondary transfer) the toner image to a sheet.

  The transfer belt 8 is provided with a belt cleaner 23 that comes into contact with the surface of the driven roller 19. Below the belt cleaner 23, a waste toner collecting container 24 for storing waste toner removed from the transfer belt 8 by the belt cleaner 23 is detachably disposed.

  The toner supply unit 4 includes the four toner cartridges 16 disposed above the upper running surface of the transfer belt 8. The toner supply unit 4 is held by a frame of the main body of the printing unit 1 so that the toner supply unit 4 can be moved up and down from a printing execution position shown in FIG.

  An electrical unit 25 is disposed on the upper left side of the toner supply unit 4. A circuit board on which a control device composed of a plurality of electronic components is mounted is mounted on the electrical component 25.

  A cooling unit 26 is disposed on the left side of the toner supply unit 4 and the electrical unit 25 along the inner wall of the main body of the printer 1. The cooling unit 26 includes an exhaust port 27 communicating with the outside at the upper left side of the main body of the printer 1, and exhausts hot air after heat exchange from the exhaust port 27 to the outside.

  The paper feed unit 5 includes one paper feed cassette 28. In the paper feed cassette 28, a large number of sheets P are placed and accommodated on a bottom plate (not shown). A paper take-out roller 29, a feed roller 31, a separating roller 32, and a standby conveyance roller pair 33 are disposed in the vicinity of the paper feed port (right side of the drawing) of the paper feed cassette 28.

  The secondary transfer section described above is formed in the paper transport direction (vertical upward direction in the figure) of the standby transport roller pair 33, and the belt-type fixing unit 6 is disposed downstream (upward in the figure) of the secondary transfer section. ing.

  The belt-type fixing device 6 has a heat-insulating housing 34 and is provided at its lower portion with a carry-in port 35 into which a sheet onto which a toner image has been transferred is carried in as indicated by an arrow. In addition, an upper part of the housing 34 is provided with a pair of carry-out rollers 36 from which the paper on which the toner image is fixed is carried out.

  In the conveyance path between the carry-in entrance 35 and the carry-out roller pair 36, a heating roller, a fixing belt, and a fixing roller incorporating a heat source such as a halogen lamp are arranged on the left side, and a pressing roller is arranged on the right side. Has been.

  When single-sided printing is performed using a recording medium P such as a sheet of paper, first, the uppermost sheet of the paper feeding cassette 28 is taken out by the paper take-out roller 29, the feeding roller 31, and the separating roller 32. The recording medium P is brought into contact with the nipping portion of the standby conveyance roller pair 33, temporarily stopped, and stands by.

  On the other hand, the image forming section 2 primarily transfers the four color toner images onto the transfer belt 8. The standby conveyance roller pair 33 rotates so that the printing start position of the recording medium P reaches the secondary transfer unit in accordance with the timing at which the leading edge of the toner image on the transfer belt 8 is conveyed to the secondary transfer unit. Start recording medium P.

  The recording medium P onto which the toner image has been transferred in the secondary transfer unit is carried into the belt-type fixing unit 6. While the recording medium P is nipped by a fixing roller and a pressing roller and conveyed upward, the toner image secondarily transferred to the paper surface, which is the left surface in the figure, is fixed to the paper surface by heat and pressure.

  The recording medium P on which the toner image is fixed is unloaded from the fixing device 6 by the unloading roller pair 36, the unloading path is switched downward by the discharge port switching mechanism 37, and as indicated by the broken line arrow c by the discharge roller pair 38. The paper is discharged to the paper discharge tray 39.

  On the other hand, in the case of double-sided printing, the same process as in the case of single-sided printing described above is performed until the recording medium P having the toner image fixed on the surface is unloaded from the belt-type fixing unit 6 and reaches the discharge port switching mechanism 37. .

  Thereafter, in the case of duplex printing, the recording medium P is switched upward by the discharge port switching mechanism 37, and the entire portion is temporarily transported by the switchback roller pair 41 as indicated by a broken line arrow d. Then, the rear end portion of the recording medium P immediately before passing through the switchback roller pair 41 is detected by a sensor (not shown), and the carry-out is stopped.

  Then, as the switchback roller pair 41 rotates in the feed back direction, the recording medium P is pulled back in the direction opposite to the carry-out direction as indicated by the one-dot chain line arrow e, with the rear end portion up to that point being the head. , And sent to the switchback return path 42.

  The switchback return path 42 is the return path of the duplex printing transport unit 7. The duplex printing transport unit 7 is bent downward from the return start roller pair 43a and extends vertically, and then returns from the return end path 44b that reverses the recording medium P that is bent leftward and finally returned. A return path is provided.

  In the return intermediate path 44a, return intermediate roller pairs 43b and 43c are arranged. Further, a return terminal roller pair 43d is disposed in the return terminal path 44b. The return path exit from the return terminal roller pair 43 d joins the transport path from the paper feeding unit 5 to the standby transport roller pair 33.

  The recording medium P sent out to the conveyance path from the return end roller pair 43d to the standby conveyance roller pair 33 is reversed front and back and front and back when printed on the surface. That is, it is sent to the intermediate transfer section with the rear end of the back surface as the head.

  The image forming unit 2 rotates and develops the image data of the print information by 180 °, and primarily transfers the toner image of the rotated image data onto the transfer belt 8. The transfer belt 8 secondarily transfers a toner image obtained by rotating image data by 180 ° to the back surface of the recording medium P whose front and back and front and back are reversed.

  The recording medium P on which the toner image rotated 180 ° on the back surface is secondarily transferred is fixed on the back surface in the belt-type fixing unit 6, and the carry-out path is switched downward by the switchback mechanism 37. 38, the paper is discharged to the paper discharge tray 39 as indicated by the broken line arrow c.

  In the above description, the case where the printing unit 1 prints on a sheet recording medium P as a page printer has been described as an example. However, when the printing unit 1 operates as the printing unit 1 of the printing apparatus 50 shown below, the arrow f in FIG. , A roll paper recording medium (to be described later) carried in from the lower carry-in entrance 45 is conveyed to a conveyance roller pair 46, a toner image is secondarily transferred to the roll paper recording medium, the toner image is fixed, and then discharged. The paper is discharged by the roller pair 38.

  2A is a perspective view showing the printing apparatus according to the first embodiment together with a detachable consumable, FIG. 2B is a plan view thereof, and FIG. 2C is hatched below the front of FIG. It is a top view of the unwinding unit pulled out from this unwinding unit attaching part.

  As shown in FIGS. 2A and 2B, the printing apparatus 50 includes a base member 51. The upper surface of the base member 51 forms a mounting surface 52. The printing unit 1 is placed and fixed to the right side of the placement surface 52, and a winding unit 53 is disposed at a position aligned to the right side of the printing unit 1.

  The winding unit 53 includes a winding holding unit 54 erected on the rear portion of the placement surface 52. The winding holding unit 54 includes a core tube cantilever shaft 55 extending forward from the center of the front surface. A guide roller 56 that extends in the vicinity of the left end portion of the paper discharge tray 39 of the printing unit 1 is disposed at the upper left corner of the winding holding unit 54.

  A bare core tube 57 (second core tube 57b) is fitted to the core tube cantilever shaft 55 so as to be pushed from the front to the back as indicated by an arrow g. 2B, the two-dot chain line indicates that the recording medium discharged from the discharge roller pair 38 to the discharge tray 39 as shown by the broken line arrow c in FIG. A conveyance path 58 during printing when being wound around the section 53 is shown.

  A recording medium supply unit 61 shown in FIG. 2C is provided with an arrow i or an arrow j from the base member 51 inside the front side surface 59 indicated by hatching on the front surface of the base member 51 shown in FIG. As shown in the figure, it is arranged so as to be engaged with a removable internal frame 62.

  The recording medium supply unit 61 includes an unwinding unit 63, a tension roller 64, a guide roller 65, a roll width regulating unit 66, an intermediate conveyance roller 67, an auto cutter 68, and a main body entry conveyance roller 69. Note that the auto cutter 68 is disposed to cut out the sheet from the roll-shaped recording medium 73 when the printing unit 1 is used as a page printer with the configuration of this example.

  The unwinding part 63 includes an unwinding holding part 71 erected on the rear part of the internal frame 62. The unwinding holding unit 71 includes a core tube cantilever shaft 72 that extends forward from the center of the front surface. The first core tube 57a holding the roll-shaped recording medium 73 before printing shown in FIG. 2A is pushed into the core tube cantilever shaft 72 from the front to the back as shown by an arrow h. Fitted.

  The recording medium 73 is formed by superimposing a long label sheet with back paste on a mount as a long release sheet, and the first end is fixed to the first core tube 57a. It is wound around the core tube 57a in a roll shape.

  In this manner, the unwinding unit 63 for supplying the roll-shaped recording medium 73 to the printing unit 1 is arranged at the lower part of the printing unit 1, and the winding unit 53 for storing the printed recording medium 73 is disposed in the printing unit. Since the configuration is arranged on one side surface, the printing apparatus 50 of this example has a small configuration that is efficient with respect to the installation area.

  In the following description, a roll wound around the first core tube 57a is referred to as a “roll body 73”, and a belt drawn out from the roll body 73 is referred to as a “recording medium 73”. The name will be changed with the same number.

  In this example, as shown in FIG. 2A, the mounting surface 52 of the base member 51 has a core tube cantilever shaft 55 of the winding portion 53 and a core tube cantilever shaft 72 of the unwinding portion 63. A hole 74 that can pass when the recording medium 73 that has been printed is rewound is formed in the opposite portion.

  FIG. 3A is a perspective view showing the printing apparatus 50 in a state where the recording medium 73 is set on the printing apparatus 50 to be printed on the roll-shaped recording medium 73 in the printing apparatus 50 described above, and FIG. FIG.

  3 (a) and 3 (b) show the same components as those shown in FIGS. 1 (a) and (b) and FIGS. 2 (a), (b) and (c). The same numbers are assigned to (a), (b) and FIGS. 2 (a), (b), (c).

  As shown in FIGS. 3A and 3B, in order to set the recording medium 73 in the printing apparatus 50, the user inserts the recording medium 73 described in FIG. First, the leading end (starting end) of the recording medium 73 is pulled out from the roll body 73.

  Then, as shown in the printing conveyance path 58 indicated by a thick broken line, the user sequentially passes the pulled-out recording medium 73 over the tension roller 64, the guide roller 65, the roll width regulating unit 66, and the intermediate conveyance roller 67. . Thereafter, the recording medium 73 is automatically guided from the auto cutter 68 to the position of the main body entering and conveying roller 69 and stopped.

  Next, the recording medium 73 is drawn into the printing unit 1 from the lower carry-in port 45 of the printing unit 1, and the secondary transfer unit of the conveyance roller pair 46, the standby conveyance roller pair 33, and the secondary transfer roller 21 shown in FIG. The belt type fixing unit 6, the discharge port switching mechanism 37, and the discharge roller pair 38 are sequentially passed.

  Finally, the user hooks the leading end of the recording medium 73 pulled out from the paper discharge roller pair 38 onto a guide roller 56 that extends forward from the upper left corner of the winding holder 54 as shown in FIG. Further, the leading end pulled out is fixed to the bare second core tube 57 b held by the core tube cantilever shaft 55. Then, printing is continuously performed on the recording medium 73 by the same processing as that described for single-sided printing in FIGS. 1 (a) and 1 (b).

  As a result, the print completion portion of the recording medium 73 that is drawn from the roll body 73 that rotates in the clockwise direction as indicated by the arrow k from the unwinding portion 63 and has the desired image printed on the label surface by the printing unit 1 is Sequentially, it is wound around the second core tube 57b that is held by the core tube cantilever shaft 55 of the winding portion 53 and rotates counterclockwise as indicated by the arrow m. These are performed by the control unit.

  FIG. 4A shows a state in which the printing on the roll-shaped recording medium 73 proceeds to the final stage as described above, and the rear end 73z of the recording medium 73 is detached from the first core tube 57a of the unwinding portion 63. FIG. 4B is a diagram illustrating a state in which the recording medium 73 that has been printed is completely wound on the winding unit 53.

  In the state of FIG. 4B, although not particularly shown, the rear end 73z shown in FIG. 4A of the recording medium 73 is temporarily fixed to the uppermost surface of the roll body 73 using an adhesive tape or the like. . Further, in this state, as is apparent in the printing progress state shown in FIGS. 3A, 3B and 4A, the roll body 73 is attached to the second core tube 57b with the printing surface inside. It is wound.

  The roll body 73 wound up in this way is usually considerably heavy in terms of handling of 30 kg in weight, and moves by removing the roll body 73 from the winding portion 53 at a high position. If this happens, there is a risk of falling, which causes a safety problem.

  Further, when the print data of the roll body 73 wound up has the rear end portion 73z on the uppermost surface of the roll body 73 and the recording medium 73 is pulled out as it is, the print data is reversed in the front and back directions at the time of printing. It has become.

  Accordingly, when printing is added as post-processing, processing for determining a position where printing is to be added is difficult. Further, in order to cope with this difficulty, complicated processing such as adding mark printing to the initial print data in advance or performing reversal processing of the image data for additional printing is required.

  In this example, the recording medium 73 wound around the winding unit 53 is unwound by a simple method so that the danger due to dropping or the like is eliminated and the print data of the roll body 73 is the same as before and after printing. It is configured to rewind to the part 63. This will be described below.

  FIG. 5A shows a roll-shaped recording medium 73 that has been printed and wound on the winding unit 53 without passing through the printing conveyance path 58 shown in FIGS. 3A and 3B. FIG. 5B is a cross-sectional view showing the state of the printing apparatus 50 that rewinds directly to the unwinding portion 63 through the hole 74 that is the opening of the mounting surface 52 of the base member 51, and FIG.

  5 (a) and 5 (b) is different only in whether the recording medium 73 is wound around the second core tube 57b or the first core tube 57a. Since the configuration is the same as that shown in FIGS. 3B and 3A, only the portions necessary for the explanation are given the same numbers as those in FIGS. 3B and 3A.

  As shown in FIGS. 5A and 5B, without removing the roll body 73 wound around the winding portion 53 from the core tube cantilever shaft 55, the rear end portion 73z of the recording medium 73 (FIG. (see also a)) is pulled out from the take-up portion 53, drawn into the base member 51 through the hole 74, and the recording medium 73 taken up by the take-up portion 53 of the unwind portion 63 has been wound. The first core tube 57a is fixed.

  Thereafter, the core tube cantilever shaft 72 of the unwinding part 63 is rotated by the control unit in the direction opposite to that during printing as shown by an arrow n in FIG. The rewinding of the printed roll body 73 is started.

  In FIG. 5 (a), the roll body 73 before the start of rewinding and its transport path are indicated by solid lines and broken lines. For comparison, the roll body 73 and the transport path that are in the state after completion of rewinding are shown. Each is indicated by the same reference numeral “73 ′”.

  6A is a cross-sectional view showing the printing apparatus 50 in a state where the roll body 73 is held on the unwinding section 63 after the rewinding of the printed roll body 73 ′ from the winding section 53 is completed. Is an external perspective view thereof.

  The roll body 73 that has been rewound can be easily removed from the core tube cantilever shaft 72 as indicated by a roll body 73 ′ indicated by an arrow p in FIG. 6B, the roll member 73 is taken out after the recording medium supply unit 61 shown in FIG. 2C is pulled out from the stand member 51. It is easier to work.

  In this way, the roll body 73 that has been printed and rewound is left in the state when the original printing was started before and after the print data printed on the front side of the roll, and left and right. When post-processing such as printing is necessary, it is not necessary to perform a troublesome rewinding operation in a separate process, and the roll body 73 is mounted on the unwinding unit 63 as it is and a desired printing position is set in the printing unit. Therefore, additional printing is easy.

  Moreover, since the same core tube of the roll body attached to the unwinding part before printing can be used as the rewinding core tube, the cost performance is good and it is possible to contribute to eliminating waste of resources.

  In the rewinding of the roll body 73, the control unit rotates the unwinding unit 63 in the counterclockwise direction opposite to the clockwise rotation of the winding unit 53 (FIG. 5). (Refer to arrow n in (a)), the final printed surface of the roll body 73 that has been rewound is arranged on the front side, but is not limited thereto.

  FIG. 7A is a diagram illustrating another example of the rewinding rotation direction, and FIG. 7B illustrates the conveyance of the recording medium 73 drawn out from the roll body mounted on the unwinding unit 63 in the case of the additional printing. It is a figure which shows the setting method to a path | route.

  As shown in FIG. 7A, both the feed-out rotation of the winding unit 53 and the rewinding rotation of the unwinding unit 63 rotate in the same clockwise direction as indicated by arrows g and r, respectively. Thereby, the roll body 73 with the printing surface on the back side is wound up around the unwinding portion 63.

  When additional printing is performed on the roll body 73, the unwinding rotation of the unwinding portion 63 differs from the clockwise direction indicated by the arrow k in FIG. 3B, as shown by the arrow s in FIG. 7B. Clockwise direction. The printed surface on which printing has been completed is formed on the back side as described above.

  However, the recording medium 73 drawn out from the roll body 73 passes through the lower side of the tension roller 64 as in the case of FIG. 3B, and passes through the conveyance path 58 during printing as it is in the case of FIG. If the paper is passed to the winding unit 53, additional printing can be performed without any problem.

Although several embodiments of the present invention have been described, the present invention is included in the invention described in the claims and the equivalents thereof. Hereinafter, the invention described in the scope of claims of the present application will be appended.
[Appendix 1]

An unwinding section for rotatably holding the first core tube around which the recording medium is wound;
A printing unit for printing on the recording medium delivered from the unwinding unit;
A winding unit that fixes a starting end of the recording medium discharged from the printing unit and rotatably holds a second core tube that winds up the recording medium to be discharged;
When the recording medium wound up by the winding unit is rewound to the winding unit, the winding is performed in a direction opposite to the rotation direction of the winding unit when the recording medium is wound by the winding unit. A control unit that rotates and rewinds the unit;
A printing apparatus comprising:
[Appendix 2]

An opening is formed between the winding unit and the unwinding unit, and includes a base member on which the printing unit is placed.
The recording medium wound around the second core tube is unwound to the unwinding section through the opening in a state where the end is fixed to the first core tube,
The winding part is provided at a position higher than the unwinding part,
The printing apparatus according to Supplementary Note 1, wherein
[Appendix 3]

The printing unit discharges the printing completion part of the recording medium in a face-down state, and the winding unit winds up the printing completion part of the discharged recording medium in a face-up state, The unwinding unit rewinds the unwinding from the winding unit in a face-up state,
The printing apparatus according to appendix 1 or 2, characterized in that:
[Appendix 4]

The printing unit discharges the printing completion part of the recording medium in a face-down state, and the winding unit winds up the printing completion part of the discharged recording medium in a face-down state, The unwinding unit rewinds the unwinding from the winding unit in a face-up state,
The printing apparatus according to appendix 1 or 2, characterized in that:
[Appendix 5]

The unwinding unit is disposed below the printing unit, and the winding unit is disposed in proximity to a side portion in the discharge direction of the printing unit.
The printing apparatus according to any one of appendices 1 to 4, wherein:

  Further, in the above-described embodiment, the hole 74 that can be passed when the recording medium 73 that has been printed is rewound is formed on the mounting surface 52 of the base member 51. The mounting surface 52 excluding the portion where the printing unit 1 and the winding holding unit 54 of the winding unit 53 are disposed may be blown out.

  Further, the core tube 57 (57a or 57b) is held by being fitted to the core tube cantilever shaft 55 or 72. However, the present invention is not limited to this, and both ends of the support shaft inserted into the core tube 57 are both supported. The structure may be such that the bearing is pivotally supported, and the core tube 57 may be attached and detached in the vertical direction.

  INDUSTRIAL APPLICABILITY The present invention can be used in a small and convenient printing apparatus that can safely and easily take out a roll-shaped recording medium having a large weight after printing.

DESCRIPTION OF SYMBOLS 1 Printing unit 2 Image formation part 3 Transfer belt unit 4 Toner supply part 5 Paper feed part 6 Belt type fixing unit 7 Double-sided printing conveyance unit 8 Transfer belt 8a Lower running surface 9 (9y, 9m, 9c, 9k) Developing device 10 Photosensitive drum 11 Cleaner 12 Charging roller 13 Optical writing head 14 Developer 15 Developing roller 16 Toner cartridge 17 Replenishment path 18 Drive roller 19 Follower roller 21 Secondary transfer roller 22 Primary transfer roller 23 Belt cleaner 24 Waste toner collection container 25 Electrical equipment Unit 26 Cooling unit 27 Exhaust port 28 Paper feed cassette 29 Paper take-out roller 31 Paper feed roller 32 Rolling roller 33 Standby conveyance roller pair 34 Housing 35 Carry-in port 36 Carry-out roller pair 37 Discharge port switching mechanism 38 Paper discharge roller pair 39 Paper discharge Tray 41 Switchback roller pair 4 Switchback return path 43a Return start roller pair 43b, 43c Return intermediate roller pair 43d Return end roller pair 44a Return intermediate path 44b Return end path 45 Lower carry-in port 46 Transport roller pair 50 Printing device 51 Stand member 52 Mounting surface 53 Winding Portion 54 Winding holding portion 55 Core tube cantilever shaft 56 Guide roller 57 Core tube 57a First core tube 57b Second core tube 58 Transport path during printing 59 Front side surface 61 Recording medium supply unit 62 Internal frame 63 Unwinding portion 64 Tension roller 65 Guide roller 66 Roll width regulating portion 67 Intermediate conveyance roller 68 Auto cutter 69 Main body entry conveyance roller 71 Unwinding holding portion 72 Core tube cantilever shaft 73 Recording medium (roll body)
74 holes

Claims (3)

An unwinding section for rotatably holding the first core tube around which the recording medium is wound;
A printing unit for printing on the recording medium delivered from the unwinding unit;
A winding unit that fixes a starting end of the recording medium discharged from the printing unit and rotatably holds a second core tube that winds up the recording medium to be discharged;
When the recording medium wound up by the winding unit is rewound to the winding unit, the winding is performed in a direction opposite to the rotation direction of the winding unit when the recording medium is wound by the winding unit. A control unit that rotates and rewinds the unit;
Including
The printing unit discharges the printed part of the recording medium in a face-down state,
The winding unit winds up the printed portion of the discharged recording medium in a face-down state, and the unwinding unit rewinds from the winding unit in a face-up state,
A printing apparatus characterized by that . An opening is formed between the winding unit and the unwinding unit, and includes a base member on which the printing unit is placed.
The recording medium wound around the second core tube is unwound to the unwinding section through the opening in a state where the end is fixed to the first core tube,
The winding part is provided at a position higher than the unwinding part,
The printing apparatus according to claim 1. The unwinding unit is disposed below the printing unit, and the winding unit is disposed in proximity to a side portion in the discharge direction of the printing unit.
The printing apparatus according to claim 1, wherein the printing apparatus is a printer.