JP2004142146A - Printer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a printer in which a recording medium can be protected against a flaw or a pressed trace being caused by a print head and a platen. <P>SOLUTION: The printer A comprises a platen 12, and a print head 11 disposed oppositely to the platen 12 wherein the platen 12 is supported rotatably and its circumferential surface includes a printing circumferential surface part facing the print head 11 during print operation, and a retreating circumferential surface part facing the print head during nonprint operation. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a printer, and more particularly, to a platen release mechanism.
[0002]
[Prior art]
In the case of a dot type printer or a sublimation type printer, printing on a recording medium is performed with an ink ribbon and a recording medium interposed between a print head and a platen. For example, when performing back printing of a photographic photosensitive material, a dot type printer is used. As a general printer having a mechanism for separating a print head and a platen in this type of printer, for example, a printer described in Patent Document 1 has been proposed.
[0003]
[Patent Document 1]
JP-A-2002-31856.
[0004]
[Problems to be solved by the invention]
On the other hand, the gap between the print head and the platen is very narrow, for example, about 0.6 mm, and when performing a process other than printing, such as rotating the recording medium in the printer, or simply conveying only, This causes scratches and imprints on the recording medium.
[0005]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a printer that can prevent scratches and press marks on a recording medium due to a print head and a platen.
[0006]
[Means for Solving the Problems]
According to the present invention, in a printer including a platen and a print head arranged to face the platen, the platen is rotatably supported, and a peripheral surface thereof faces the print head during printing. And a retreating peripheral portion facing the print head during non-printing.
[0007]
According to this means, the evacuation can be performed only by rotating the platen, and the occurrence of scratches and press marks on the recording medium when performing other processing on the recording medium is performed with a simple structure. Can be prevented.
[0008]
Further, in the present invention, the printing peripheral surface portion may have a curved shape having a different radius for each predetermined range. Alternatively, the printing peripheral surface portion may have a curved surface shape that differs at least in either the center position or the radius for each predetermined range.
[0009]
According to this means, the gap between the print head and the platen, for which accuracy is required, can be adjusted only by rotating the platen.
[0010]
Further, in the present invention, it is possible to further comprise a rotating means for rotating a recording medium printed by the print head.
[0011]
In this case, the rotating means supports first and second holding portions for holding the recording medium, a rotation driving portion for rotating the first holding portion, and a rotatable support for the second holding portion. A supporting member movable so that the second holding portion is located at a holding position or a retracted position; and a biasing member for biasing the supporting member such that the second holding portion is located at the retracted position. A member and a moving means for moving the support member such that the second holding portion is positioned at the holding position against the urging member may be provided.
[0012]
In addition, the moving unit includes a cam member that contacts the support member, and a driving unit that rotates the cam member. The rotation of the cam member causes the second holding unit to move the second holding unit to the holding position or A cam surface for moving the support member so as to move to the retracted position, wherein the platen rotates in conjunction with rotation of the cam member, and the second holding portion is in the holding position when the second holding portion is at the holding position. The retractable peripheral portion may face the print head, and the print peripheral portion may face the print head when the second holding portion is at the retracted position.
[0013]
Further, the printer of the present invention can be used as a back printer which is provided in a photosensitive material processing apparatus and performs back printing of a photosensitive material.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram of the configuration of a photosensitive material processing apparatus 100 to which the present invention is applied, and roughly includes an exposure unit 103 and a processing unit 104.
[0015]
The photosensitive material processing apparatus 100 includes a roll paper RP, which is one of the photosensitive materials and is wound with a sheet of photographic paper P. The roll paper RP is wound around a core, and is a light-shielding device that completely blocks light. It is rotatably provided in the paper magazine 101 in the state. A cutter unit 102 is provided near the opening of the paper magazine 101, and cuts the roll paper RP immediately after being sent out from the opening of the paper magazine 3 into a desired cut size before exposure.
[0016]
The photographic paper P cut into a predetermined size by the cutter unit 102 is sequentially sent to an exposure position of an exposure table 103 a provided at a bottom portion of the exposure unit 103. The exposure table 103a has a built-in suction transport mechanism for sucking and transporting the rear surface of the cut photographic paper P and transporting the photographic paper P to the exposure position.
[0017]
As described above, when the preparation for exposure is completed, the digitized film image is displayed on an image display device 103e such as an LCD by a scanner device (not shown), and then the light from the light source 103b is directed to the exposure table 103a. The light is irradiated, passes through an RGB filter 103c, a light diffusion unit 103d, an image display device 103e, and an optical system 103f including a zoom lens and the like, and is exposed so that an image is formed on the photographic printing paper P.
[0018]
After this exposure, the photographic paper P is transported in the direction of arrow D1 toward the transport unit 107, and is transported from the transport unit 107 to the downstream processing unit 104. Here, between the exposure unit 103 and the transport unit 107 and the processing unit 104, the influence of gas generated by vaporizing each processing liquid stored in each processing liquid tank 108 in the processing unit 104 due to a rise in temperature or the like. A partition wall 109 is provided so as not to be affected. An opening / closing shutter 110 is provided on the partition wall 109. When the printing paper P is transported from the transport unit 107 to the processing liquid tank 108 of the processing unit 104, the shutter 110 is opened and printed. The paper P is transported in the direction of arrow D2, and is closed in other cases.
[0019]
Next, the photographic paper P is sequentially conveyed downstream through the processing liquid tanks 108 by the conveyance rack device 111 provided in each processing liquid tank 108 in the processing section 104, and is subjected to development processing after exposure, bleach-fixing. Etc. are performed. When transporting the photographic paper P while transferring it between the processing liquid tanks 108, the photographic paper P is turned by the guide portion 112 and is transported smoothly.
[0020]
The photographic paper P is conveyed to the drying device 113 after passing through each processing liquid tank 108 of the processing unit 104. In the drying device 113, the printing paper P is once conveyed downward, and then conveyed upward. The drying device 113 blows hot air from the group of nozzles 114 onto the printing screen of the printing paper P during the transportation to dry the surface thereof. Rollers 115 and 116 are provided above the drying device 113 to discharge the photographic paper P to the outside. The rollers 115 and 116 discharge the photographic paper P from the discharge port 117 to the outside, and the process ends.
[0021]
Next, the photosensitive material processing apparatus 100 includes a printer A in a transport unit 107 which forms a transport path of the photographic paper P transported from the exposure table 103a of the exposure unit 103 to the processing unit 104. The printer A is a back printer for performing back printing of a management number or the like on the back surface of the exposed photographic paper P, and has a rotating mechanism for rotating the photographic paper P to change its direction.
[0022]
In the present embodiment, since the photographic paper P is rotated after exposure by the rotation mechanism, the rotation accuracy required during exposure is not required, a simpler configuration can be adopted, and the rotation mechanism becomes complicated and cost increases. Can be suppressed. Further, by rotating before reaching the processing unit 104, it is possible to improve the transport efficiency in the processing unit where the transport distance is relatively long.
[0023]
Further, when the photographic paper P is rotated, if the photographic paper P is held between the transport roller and the pressure roller, the rotation of the photographic paper P becomes difficult. Similarly, since the gap between the print head and the platen is very small, rotating the photographic paper P may damage it. Therefore, the printer A of the present embodiment includes a pressure release mechanism for the pressure roller and a retracting mechanism for the platen.
[0024]
In the present embodiment, such a rotation mechanism, a pressure release mechanism, and a retraction mechanism for the platen are housed in one printer A, but they are not necessarily required, and they can be independently configured. is there. Further, the present invention is not limited to the photosensitive material processing apparatus, but can be applied to other uses.
[0025]
Hereinafter, the printer A will be described in detail. FIG. 2 is a partially cutaway plan view of the printer A (corresponding to a right side view in FIG. 1), and FIG. 3 is a partially cutaway plan view of the printer A in which the transport roller and the ribbon cassette are removed from FIG. 4 is a cross-sectional view (partially broken / omitted) along line XX in FIG. 2, FIG. 5 is a cross-sectional view (partially omitted) along line YY in FIG. 4, and FIG. FIG. 6 is a cross-sectional view (partially omitted) along line ZZ in FIG. 5.
[0026]
<Crimping release mechanism>
The main housing 1 of the printer A includes a top plate 1a, a bottom plate 1b, and four side plates 1c, and has a box shape. Further, a second bottom plate 2b wider than the bottom plate 1b is fixed to the bottom plate 1b, and a pair of second side plates 2c is provided upright on both left and right ends of the second bottom plate 2b. In addition, a second upper plate 2a is erected at the center of the upper end of the second side plate 2c.
[0027]
Between the second side plates 2c, shaft portions 3a 'and 3b' of two transport rollers 3a and 3b are rotatably supported, and these transport roller transport rollers 3a and 3b are rotationally driven by a drive source (not shown). Is done. The roller portion of the transport roller 3a is provided so as to traverse the main body housing 1, but the roller portion of the transport roller 3b has its central portion removed for convenience of the layout of the apparatus (FIG. 2). reference).
[0028]
Pressing rollers 4a and 4b are provided as pressing rollers that are pressed against and driven by the transport rollers 3a and 3b. As shown in FIG. 3, six openings 1 a ′ are provided in the upper plate 1 a, and a part of the four roller portions of the pressure rollers 4 a, 4 b is connected to four of the six openings 1 a, respectively. From the upper plate 1a ', and can be pressed against the transport rollers 3a and 3b above the upper plate 1a. The photographic paper P is conveyed while being nipped between the roller portions of the conveying rollers 3a and 3b and the roller portions of the pressing rollers 4a and 4b while being guided by the guide plate 1a "provided on the upper plate 1a. In this embodiment, two pairs of the transport roller and the pressure roller are provided, but it goes without saying that more than two pairs may be provided.
[0029]
The pressure rollers 4a, 4b are supported by roller support members 5a, 5b, respectively. The roller supporting members 5a, 5b are U-shaped supporting members 51a, 51b for rotatably supporting both ends of the shaft portions 4a ', 4b' of the pressing rollers 4a, 4b, and supporting members fixed to the supporting members 51a, 51b, respectively. And members 52a and 52b. The support members 52a and 52b are rotatably supported by shafts 6a and 6b pivotally supported between the left and right side plates 1c, and the entire roller support members 5a and 5b can rotate around these shafts 6a and 6b, respectively. It has become. For this reason, with the rotation of the roller support members 5a, 5b, the pressing rollers 4a, 4b have a pressing position where the pressing rollers 4a and 4b press against the conveying rollers 3a and 3b, and a retracting position where the pressing rollers 4a and 4b are separated from the conveying rollers 3a and 3b. Will move between them.
[0030]
Here, the shafts 6a and 6b are arranged in parallel with the axes of the transport rollers 3a and 3b, and the axes of the transport rollers 3a and 3b, the axes of the shafts 6a and 6b, and the axes of the pressure rollers 4a and 4b are all provided. Parallel. Therefore, when the pressure rollers 4a, 4b are pressed against the transport rollers 3a, 3b by the rotation of the roller support members 5a, 5b, they can be pressed with uniform pressure in the axial direction.
[0031]
Next, the pressure release mechanism of the pressure rollers 4a and 4b will be further described with reference to FIG. Pins 52a 'and 52b' are fixed to side plates of the support members 52a and 52b, and one end of the connecting member 7 is rotatably supported by the pins 52b '. A long hole 7a is provided at the other end of the connecting member 7, into which a pin 52a 'is inserted. By connecting the roller supporting members 5a and 5b via the connecting member 7, the roller supporting members 5a and 5b rotate in conjunction with each other.
[0032]
On the other hand, springs 8a and 8b are wound around the shafts 6a and 6b, and one ends of the springs 8a and 8b abut against the lower surface of the upper plate 1a, and the other ends abut the side surfaces of the pins 52a 'and 52b', respectively. It is locked in contact. The springs 8a and 8b are mounted so as to exert elastic force in a direction in which both ends open, and the roller supporting members 5a and 5b are rotated counterclockwise in FIG. 6 through pins 52a 'and 52b'. That is, it functions as an urging member that constantly urges the pressure rollers 4a and 4b to move to the pressure contact position.
[0033]
Next, a telescopic actuator 9 is fixed to the bottom plate 1b. The end of the telescopic rod 9a of the actuator 9 is in contact with the side of the support member 52b. When the telescopic rod 9a is extended and presses the roller support member 5b, the roller support member 5b resists the urging force of the spring 8b. Then, the actuator 9 is rotated clockwise in FIG. 6, and the actuator 9 functions as a pressing unit.
[0034]
Next, the operation of releasing the pressure bonding by the pressure rollers 4a and 4b will be described with reference to the operation explanatory diagram of FIG.
[0035]
FIG. 7 (a) shows a mode in which the pressure rollers 4a, 4b are in the pressure contact position and are pressed against the transport rollers 3a, 3b, and FIG. 7 (b) shows the pressure rollers 4a, 4b in the retracted position. In this case, the state in which the pressure bonding is released and separated from the transport rollers 3a and 3b is shown.
[0036]
First, in FIG. 7A, the roller supporting members 5a and 5b are urged counterclockwise in FIG. 7 by the urging forces of the springs 8a and 8b, and press the pressure rollers 4a and 4b against the transport rollers 3a and 3b. In the state of being. Here, when the telescopic rod 9a of the actuator 9 is extended, the roller supporting member 5b is pressed by this, and rotates clockwise against the urging force of the spring 8b. At this time, since the roller supporting members 5a and 5b are connected by the connecting member 7, the roller supporting member 5a also rotates clockwise with the rotation of the roller supporting member 5b.
[0037]
As a result, the pressure rollers 4a, 4b supported by the roller support members 5a, 5b move in the direction away from the transport rollers 3a, 3b, and move to the retreat position as shown in FIG. 7B. As a result, the crimping is released. When crimping is performed again, the telescopic rod 9a of the actuator 9 may be contracted.
[0038]
In the present embodiment, the roller supporting members 5a and 5b are connected by the connecting member 7 so as to interlock with each other, so that the pressing of all the pressing rollers 4a and 4b is released by only one actuator 9, and It is possible to return, and it is not necessary to provide a drive source or the like for each of the pressure rollers 4a and 4b, so that the apparatus can be simplified.
[0039]
<Platen retraction mechanism>
Next, the platen retracting mechanism will be described with reference to FIGS. In the printer A, a print head 11 is fixed to an upper plate 1a via a fixture 11a. A platen 12 is arranged below the upper plate 1a so as to face the print head 11. These are arranged to face each other through one of the six openings 1a 'provided in the upper plate 1 (the uppermost left opening 1a' in FIG. 2).
[0040]
As shown in FIG. 6, an ink ribbon R is supplied between the print head 11 and the platen 12 by the ribbon supply unit 13, and the photographic paper P can be back printed by interposing the photographic paper P here. It becomes. The ribbon supply unit 13 is fixed and supported on the lower surface of the second upper plate 2a.
[0041]
The platen 12 is fixed and supported by a shaft 14 rotatably supported between the side plates 1c, and is configured to be rotatable by rotation of the shaft 14. Referring to FIGS. 3 to 5, a pulley 14 a is provided at one end of the shaft 14. On the other hand, a motor 15 is provided in the main body housing, and output shafts 15a and 15b of the motor 15 project from both side surfaces of the motor 15, and a pulley 15a 'is provided on the output shaft 15a facing outward. ing. A belt 16 is stretched between the pulley 14a and the pulley 15a ', and the tension is adjusted by winding the belt 16 around a shaft 17 protruding from the side plate 1c (FIG. 4). With such a configuration, when the motor 15 is driven to rotate, power is transmitted by the belt 16, the shaft 14 rotates, and the platen 12 rotates.
[0042]
Next, the platen 12 will be described in detail. FIG. 9 is a diagram illustrating the shape of the platen 12. The platen 12 has a printing peripheral surface facing the print head 11 during printing, and a retracting peripheral surface facing the print head 11 during non-printing (a peripheral surface other than the printing peripheral surface in FIG. 9). The peripheral surface for printing has a curved surface, and any position on the peripheral surface faces the print head 11 during printing. On the other hand, the evacuation peripheral surface portion is a peripheral surface on which the print head 11 faces during non-printing, and has a sufficient distance from the print head 11.
[0043]
In the present embodiment, by rotating the platen 12, a printing peripheral surface portion forming an appropriate gap with respect to the print head 11 is arranged facing the print head 11 at the time of printing, and at the time of non-printing, for example, as described later. When the photographic paper P is rotated in the printer A, the evacuation peripheral surface portion is opposed to the print head 11 to secure a sufficient gap with respect to the print head 11 (see FIG. 8A and FIG. (B)). Therefore, the retraction can be performed only by rotating the platen 12, and when performing another processing on the recording medium such as the photographic paper P, the structure is simple, and the scratches and the imprint marks on the recording medium are reduced. Can be prevented from occurring.
[0044]
Incidentally, the gap between the platen 12 and the print head 11 during printing is approximately 0.6 mm, and a certain degree of accuracy is required. For this reason, in the present embodiment, the printing peripheral surface of the platen 12 is not formed in a simple arc shape, but in a curved shape having a different radius for each predetermined range, or a center position and a radius are different for each predetermined range. It has a curved shape. Then, any one of the ranges can be selectively used so that an optimum gap can be obtained.
[0045]
FIG. 9 shows an example thereof, in which the printing peripheral portion is divided into five ranges A to E, and has a smooth and substantially circular arc shape as a whole. For example, in the case of the ranges A, C, and E, the center C1 is common, but the arcs have different radii of Ra, Rc, and Re, respectively. On the other hand, in the case of the range B, the center is C2 and has an arc shape with a radius Rb. In the case of the range D, the center is C3 and has an arc shape with a radius Rd. The difference between the radii Ra to Re and the difference between the centers C1 to C3 are slight differences, and for example, are preferably in the range of several tenths to several millimeters.
[0046]
In this manner, by selecting any one of the regions, the optimum gap between the platen 12 and the print head 11 can be finely adjusted at the time of actual assembly of the apparatus. At this time, the platen 12 is rotated by a small amount by the motor 15, so that the selection of the region can be performed more easily.
[0047]
<Rotating mechanism>
Next, a rotation mechanism of the photographic paper P will be described with reference to FIGS. As shown in FIG. 2, in the present embodiment, the photographic paper P conveyed in the longitudinal direction is rotated to change its direction (the photographic paper P ′), and finally rotated by 90 degrees, so that the short side is obtained. It can be conveyed in the direction. Therefore, after that, the photographic paper P can be packed and transported, so that the transport efficiency and the processing capacity can be improved.
[0048]
The printer A includes a pad 21 as a first holding portion and a pad 22 as a second holding portion, which oppose each other through an opening 1a ′ in a central portion of the upper plate 1a. The photographic paper P is sandwiched from the front and back. The printer A includes a rotation drive unit 23 that rotates the pad 21. The rotation drive unit 23 includes a spindle 23a having a pad 21 attached to an end, a pulley 23b attached to the spindle 23a, and a bearing 23d rotatably supporting a center shaft 23c of the spindle 23a. The bearing 23d is supported by the second upper plate 2a.
[0049]
Further, the rotation drive unit 23 further includes a motor 23e mounted on the second upper plate 2a, and a pulley 23f mounted on an output shaft of the motor 23e, and between the pulley 23f and the pulley 23b. Has a belt 23g stretched. Therefore, when the motor 23e is rotated, the rotational force is transmitted to the spindle 23a via the belt 23g, and the pad 21 can be rotated.
[0050]
Next, the pad 22a is rotatably supported by the support member 24. The support member 24 includes a cylindrical body 24a to which a pad 22a is rotatably mounted, and a cylindrical body 24b slidably supported in the cylindrical body 24a and having a spring 24c mounted between the cylindrical body 24a and the cylindrical body 24a. , Is provided. The cylindrical body 24a is slidably supported in a cylindrical guide member 26 fixed in the main body housing 1. When the cylindrical body 24a moves, the pad 22 sandwiches the printing paper P together with the pad. It is movable between a holding position and a retreat position separated from the pad 21. A spring 25 is loaded in a gap between the cylindrical body 24a and the guide member 26, and the spring 25 functions as an urging member for urging the support member 24 so that the pad 22 is always located at the retracted position. .
[0051]
On the other hand, the cam member 27 is in contact with the end surface of the cylindrical body 24b. The cam member 27 is attached to the output shaft 15 b facing the inside of the motor 15, and is rotated by the rotation of the motor 15. The cam member 27 and the motor 15 function as moving means for moving the support member 24 so that the pad 22 is located at the holding position. Hereinafter, this point will be described in detail, and the rotation operation of the photographic paper P will be described with reference to the operation explanatory diagram of FIG.
[0052]
FIG. 8A is a diagram showing a state of the photographic paper P during a non-rotating operation, and shows a case where the pad 22 is at the retracted position. FIG. 8B shows a rotating operation of the photographic paper P. FIG. 9 is a diagram showing a state at the time, showing a case where the pad 22 is at a holding position.
[0053]
Here, the cam surface (peripheral surface) of the cam member 27 has a protruding surface 27a whose distance from the center is gradually increasing and a surface whose distance from the center is constant. In the embodiment shown in FIG. 8A, the protruding surface 27a does not abut on the end surface of the cylindrical body 24b constituting the support member 24. Then, when the cam member 27 is rotated by the motor 15 and the protruding surface 27a comes into contact with the end surface of the cylindrical body 24b, the cylindrical body 24b is pressed toward the pad 21, and the pressing force is applied to the cylindrical body via the spring 24c. The support member 24 is moved toward the pad portion 21 against the urging force of the spring 26.
[0054]
As a result, the pad 22 moves to the sandwiching position, and the pad 22 presses the pad 21, so that the photographic paper P is sandwiched therebetween as shown in FIG. 8B. The reason why the spring 24c is provided between the cylindrical body 24a and the cylindrical body 24b is to adjust the clamping force between the pad 22 and the pad 21, and the support member 24 is made of such two components. Instead, it may be composed of a single part.
[0055]
Next, when the motor 23e is rotated, the spindle 23a rotates and the pad 21 rotates, and the pad 22 also rotates following the rotation, so that the printing paper P can be rotated. After the direction of the printing paper P is changed to a desired direction, the rotation of the motor 23e is stopped, and further, the motor 15 is rotated in the reverse direction to rotate the cam member 27, whereby the state shown in FIG. It returns to the mode of (a).
[0056]
Thus, the rotation operation of the printing paper P is completed. In the present embodiment, the platen 12 and the cam member 27 are rotated by one motor 15 and both are rotated in conjunction with each other, thereby simplifying the configuration. As shown in FIGS. 8A and 8B, when the pad 22 is at the sandwiching position, the evacuation peripheral surface of the platen 12 faces the print head 11, and when the pad 22 is at the evacuation position, the platen The relative mounting angle between the platen 12 and the cam member 27 is set such that the printing peripheral surface 12 faces the print head 11. Needless to say, both may be separately driven to rotate.
[0057]
<Overall Operation of Printer A>
Finally, an example of the overall operation of the printer A will be described. First, when the photographic paper P after exposure is supplied to the printer A, the photographic paper P is transported by the transport rollers 3a, 3b and the pressure rollers 4a, 4b such that the center thereof is located between the pads 21a, 22b. Next, the operation shifts to the rotation operation of the photographic paper P, and the motor 15 is rotated to rotate the cam member 27, so that the photographic paper P is sandwiched between the pads 21 and 22 to prepare for rotation. At this time, the platen 12 also rotates so that the evacuation peripheral portion faces the print head 11.
[0058]
Next, the actuator 9 is driven to extend the telescopic rod 9a and move the pressure rollers 4a, 4b to the retracted position, thereby releasing the pressure of the pressure rollers 4a, 4b. Then, the printing paper P is rotated by rotating the motor 23e. After the rotation, the actuator 9 is driven, the telescopic rod 9a is contracted, and the pressure rollers 4a and 4b are moved to the pressure contact position again to bring the pressure contact state. Next, the motor 15 is rotated in the reverse direction, the cam member 27 is rotated in the reverse direction, and the nip of the printing paper P by the pads 21 and 22 is released. At this time, the platen 12 also rotates so that the printing peripheral surface portion faces the print head 11.
[0059]
Thereafter, the photographic paper P is back-printed by the print head 11 while the photographic paper P is transported by the transport rollers 3a and 3b and the pressure rollers 4a and 4b, and the photographic paper P is discharged to complete one unit of processing. The photographic paper P is carried out by being rotated by 90 degrees than when it is carried into the printer A, and the photographic paper P carried in the longitudinal direction is carried in the short direction.
[0060]
【The invention's effect】
As described above, according to the printer of the present invention, the evacuation can be performed only by rotating the platen. It is possible to prevent scratches and press marks from being generated.
[Brief description of the drawings]
FIG. 1 is a schematic view of the configuration of a photosensitive material processing apparatus 100 to which the present invention is applied.
FIG. 2 is a partially broken plan view of the printer A.
FIG. 3 is a partially cutaway plan view (partially omitted) of the printer A in which a transport roller and a ribbon cassette are removed from FIG. 2;
FIG. 4 is a cross-sectional view (partially broken / omitted) along the line XX in FIG. 2;
FIG. 5 is a sectional view (partially omitted) taken along line YY of FIG. 4;
FIG. 6 is a cross-sectional view (partially omitted) along the line ZZ in FIG. 5;
FIGS. 7A and 7B are operation explanatory views showing an operation of releasing the pressure bonding of the pressure rollers 4a and 4b.
FIG. 8 is an operation explanatory diagram showing a rotation operation of the printing paper P.
FIG. 9 is a view showing a shape of a platen 12;
[Explanation of symbols]
A Printer
P photographic paper (photosensitive material, recording medium)
3a, 3b transport roller
4a, 4b pressure roller
5a, 5b Roller support member
6a, 6b axis
7 Connecting members
8a, 8b Spring (biasing member)
9 Actuator (pressing means)
11 Print head
12 Platen
13 Ribbon supply unit
15 Motor
21 pad (first holding section)
22 pad (second holding part)
23 rotation drive
24 Supporting members
25 Spring (biasing member)
27 Cam member
100 Photosensitive material processing equipment
103 Exposure unit
103a Exposure table
104 processing unit

Claims (7)

In a printer including a platen and a print head arranged to face the platen,
The platen is rotatably supported, and its peripheral surface has a printing peripheral surface portion facing the print head during printing, and a retracting peripheral surface portion facing the print head during non-printing. Features printer. The printer according to claim 1, wherein the printing peripheral surface has a curved shape having a different radius for each predetermined range. 2. The printer according to claim 1, wherein the printing peripheral surface has a curved surface shape that differs at least in either a center position or a radius for each predetermined range. The printer is
The printer according to claim 1, further comprising a rotation unit configured to rotate a recording medium printed by the print head. The rotating means,
First and second holding portions for holding the recording medium,
A rotation drive unit that rotates the first holding unit;
A support member that rotatably supports the second holding portion and that is movable such that the second holding portion is located at a holding position or a retracted position;
An urging member for urging the support member so that the second holding portion is located at the retracted position;
5. The printer according to claim 4, further comprising: a moving unit configured to move the support member such that the second holding unit is positioned at the holding position against the urging member. 6. The moving means,
A cam member that contacts the support member;
Driving means for rotating the cam member,
The cam member has a cam surface for moving the support member such that the second holding portion moves to the holding position or the retracted position by rotation thereof,
The platen rotates in conjunction with the rotation of the cam member, and when the second holding portion is at the holding position, the evacuation peripheral surface portion faces the print head, and the second holding portion is 6. The printer according to claim 5, wherein the printing peripheral portion faces the print head when the printer is at the retracted position. The printer according to claim 1, wherein the printer is a back printer provided in a photosensitive material processing apparatus and performing back printing of the photosensitive material.

Images