JPH0725183B2 - Printing equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing apparatus, and more particularly to a printing apparatus that prints on a print sheet by using a plurality of line print heads.

[Conventional technology]

The conventional printing apparatus prints on a relatively small print sheet, and the line print head is
It was usually provided with one.

However, in a printing apparatus for printing on large print paper such as Japanese Industrial Standard A0 size, A1 size, it is difficult to manufacture a large line print head, and multiple line print heads are installed to make these lines. It is necessary to perform printing by driving the print heads in synchronization. At this time, since the plurality of line print heads are non-printing portions in which both ends of each line print head cannot be printed, the plurality of line print heads are arranged in a zigzag pattern by shifting their positions in the feed direction of the print paper, that is, in the sub-scanning direction. Therefore, it is necessary to prevent the printing from being lost between the line print heads.

[Problems to be solved by the invention]

In a printing apparatus in which a plurality of line print heads are arranged in a zigzag manner, it is originally desirable that one large platen roller should receive the pressing force of the plurality of line print heads arranged in a zigzag manner. The large platen roller is apt to be eccentric due to the eccentricity of the platen roller shaft itself or the pressing force of the line print head, and it is difficult to realize it because extremely high accuracy is required.

It is also conceivable to use one fixed platen for a plurality of line print heads arranged in a staggered manner, but in such a case, a large frictional force is generated between the line print head and the platen. As a result, there is a problem that wrinkles may occur on the roll paper between the line print heads located in front of and behind the feed direction of the roll paper.

In view of the above points, an object of the present invention is to dispose platen rollers corresponding to the respective line print heads arranged in a zigzag manner, and to stagger the platen rollers alternately in a zigzag cross section. It is an object of the present invention to provide a printing apparatus in which the frictional force is reduced by arranging the dummy platen, the wrinkles of the printing paper are prevented, and the feeding of the printing paper is stabilized.

[Means for solving problems]

The printing apparatus of the present invention is a printing apparatus in which a plurality of line print heads are arranged in a zigzag pattern, and a plurality of platen rollers arranged in a zigzag pattern corresponding to the plurality of line print heads and an inverted U-shaped cross section. It is characterized in that it is provided with a plurality of dummy platens formed of a plate body and arranged alternately in a zigzag pattern with the platen rollers.

[Action]

In the printing apparatus of the present invention, a plurality of platen rollers arranged in a zigzag pattern corresponding to a plurality of line print heads and a plate body having an inverted U-shaped cross section are formed. The platen rollers are arranged alternately in a zigzag pattern. The plurality of dummy platens reduce frictional force without requiring high precision to prevent wrinkles from occurring in the printing paper and stabilize the feeding of the printing paper.

〔Example〕

 Next, the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing a printing apparatus according to an embodiment of the present invention. This printing device is a magnifying copy machine,
The enlarged print unit 1 is connected to the document reading unit 2 via a cable (not shown). In this printing apparatus, for example, an A4 size document read by the document reading unit 2 is magnified 4 times in the vertical and horizontal directions by an enlargement printing unit 1 and printed as an A0 size enlarged copy.

The enlarged print unit 1 is mounted on a support frame 4 with casters, and its main body has a fixed base 5 and a movable lid member 6.
It is housed in a housing consisting of and.

A paper tray 3 formed by bending and welding a metal rod is detachably attached to the horizontal rod 4a of the support frame 4 so that the rear end bent portion 3a is hooked. As shown in FIGS. 13 (a) and 13 (b), the front end standing portion of the paper tray 3 is bent inward in a dogleg shape so that the printed roll paper 51 can be reliably captured. It is the mouse-turning part 3.

As shown in FIG. 3, the fixed base 5 has a roll paper 51 made of A0 size thermal paper at the rear half position (right half position in the figure).
Paper roll storage recess for storing the paper roll 50
5a is provided. Support plate bodies 53 are arranged at both left and right ends inside the paper roll storage portion 5a so that the paper roll 50 can be detachably and rotatably arranged. The bearing recess 53a is formed by cutting out slightly obliquely from the front to the lower front. The bearing recess 53a is formed on both end rims 5 of the paper roll 50.
The center convex shaft 52a of 2 is fitted, and the paper roll 50 can rotate freely by pulling out the roll paper 51 and the bearing concave portion.
It serves to prevent the central convex shaft 52a from being easily separated from the 53a.

Further, at the front half position (right half position in the figure) of the fixed base 5, the platen rollers 10a to 10d and the dummy platen 11a are provided.
11d, the rotary cutter 7, etc. are arranged.

Platen rollers 10a-10d and dummy platens 11a-11d
2, the platen roller 10a, the dummy platen 11b, the platen roller 10c and the dummy platen 11d in the front row and the dummy platen 11a, the platen roller 1 in the rear row are arranged as shown in FIG.
0b, the dummy platen 11c, and the platen roller 10d are arranged in front and rear in two rows. That is, the platen rollers 10a to 10d are arranged in a zigzag pattern, and the dummy platen 11
The a to 11d are staggered with the platen rollers 10a to 10d.

For example, as shown in FIG. 6, the dummy platen 11 in the front row is
b and 11d are formed of a plate body having an inverted U-shaped cross section, and are attached to a support member 14 fixed by a screw by a platen pedestal 18 (see FIG. 3) fixedly mounted on the fixed base 5, and a rear surface (by a screw). The front side in FIG. 6 is fixed. Further, the platen rollers 10a and 10c in the front row are formed in a roller shape with an elastic body such as rubber, are inserted through the rotary shaft 12, both ends of the rotary shaft 12 are inserted into the bearing member 13, and the bearing member 13 is supported by the support member 14.
The dummy platens 11b and 11d or the dummy platens 11b and 11d are secured by a fixing member 16 having a width narrower than that of the dummy platens 11b and 11d. The dummy platen in the rear row
11a and 11c and rear row platen rollers 10b and 1
0d is also formed and arranged in the same manner.

The platen rollers 10a to 10d are line thermal heads 20a.
It is provided in order to reduce the frictional force of the roll paper 51 with respect to 20d to prevent the occurrence of wrinkles and stabilize the feeding of the roll paper 51.

The dummy platens 11a to 11d are connected to the platen roller 10a.
~ 10d and the position between the platen rollers 10a ~ 10d, if the feeding speed of the roll paper 51 becomes uneven, the roll paper 51 may be jammed, wrinkled, or fed at an angle. Since normal printing is not performed due to the occurrence of such a problem, it is provided to prevent such inconvenience. At this time, the reason why the dummy platens 11a to 11d are not rollers to rotate is that the friction load on the roll paper 51 by the dummy platens 11a to 11d is increased, and the line thermal heads 20a to 20d and the platen rollers 10a to 10d on the same line are used. This is because the frictional force between and was made as close as possible.

Platen rollers 10a-10d and dummy platens 11a-11d
The platen pedestal 18 attached with the platen rollers 10a-1
0d and the dummy platens 11a to 11d are further extended obliquely downward and forward from the position where they are attached, and an elastic sheet having a surface subjected to low-friction treatment is attached to the upper surface thereof, and the feed rollers 30a to 30e are in pressure contact therewith. It is the feed roller pressing portion 18a. Further, the rotary cutter 7 is attached to the lower surface side of the platen pedestal 18.

The rotary cutter 7 is mainly composed of a fixed blade member 71 and a rotary blade member 72, and the rotation of the cutter motor 73 is transmitted to the rotary blade member 72 via a reduction gear mechanism 74 and the like, so that the rotary blade member 72 is rotated. Is rotated so that the roll paper 51 sandwiched between the fixed blade member 71 and the rotary blade member 72 is cut.

On the other hand, the movable lid member 6 is composed of two parts, a front die cast part 61 and a rear sheet metal part 62. Inside the front die-cast part 61, the line thermal head 20a is provided on the rear part.
~ 20d is attached, and the feed roller 30a is on the inside front part.
~ 30e is attached.

The line thermal heads 20a to 20d are flat type line thermal heads, and the line thermal heads 20a and 20c in the front row direct the printing portion toward the rear (left in FIG. 3) to a predetermined pressure on the platen rollers 10a and 10c. The line thermal heads 20b and 20d in the rear row are elastically attached to the platen rollers 10b and 10d with a predetermined pressure so that the printing portions are directed forward (to the right in FIG. 3). Installed in place. As a result, the line thermal heads 20a to 20d are arranged in a staggered manner with their positions and directions staggered with respect to the sub-scanning direction.

Thus, the plurality of line thermal heads 20a to 20d are arranged in a staggered manner with their positions and directions staggered with respect to the sub-scanning direction.
In addition to preventing missing of printing between 0d and narrowing the interval in the sub-scanning direction between the line thermal heads 20a to 20d, it is easy to adjust the printing timing of the line thermal heads 20a to 20d and improve the printing quality. This is because it is intended.

As a result of arranging the plurality of line thermal heads 20a to 20d in a staggered manner by staggering the positions and directions in the sub-scanning direction, the line thermal head 20b of the phase for preceding printing
And 20d and the timing of giving the print control information for the subsequent printing phase to the line thermal heads 20a and 20c are shifted by the phase difference, and the line thermal heads 20b and 20d of the preceding printing phase are also shifted. It is needless to say that it is necessary to reverse the order of giving the print control information to the line thermal heads 20a and 20c of the phase for the subsequent printing.

At the mounting portion of the line thermal heads 20a to 20d of the front die cast portion 61 of the movable lid member 6, the tension portion 61a is provided between the line thermal heads 20a and 20c in the front row and the line thermal heads 20b and 20d in the rear row. Is projected toward. The tension portion 61a is provided in the front row of the platen roller 10a and the dummy platen with the movable lid member 6 closed.
11b, the platen roller 10c and the dummy platen 11d and the dummy platen 11a, platen roller 10b, the dummy platen 11c and the platen roller 10d in the rear row
10a to 10d are formed so as to extend downward from the upper end surfaces thereof, and when the movable lid member 6 is closed, the platen roller 10a in the front row, the dummy platen 11b, the platen roller 10c and the dummy platen 11d and the dummy platen in the rear row are formed. 11a, the platen roller 10b, the dummy platen 11c, and the platen roller 10d, and serves to apply tension to the roller paper 51 stretched. The tension portion 61a applies tension to the roll paper 51 with the movable lid member 6 closed, so that the roll paper 51 is connected to the front and rear platen rollers 10a and 10c and the platen rollers 10b and 10d just by closing the movable lid member 6. Line thermal head 10b in the rear row at the start of printing caused by the slack of the roll paper 51 between the platen rollers 10a and 10c and the platen rollers 10b and 10d.
It is possible to eliminate overlapping line printing due to 10 and 10d, and prevent wrinkles from occurring on the roll paper 51.

As shown in FIG. 7, each of the feed rollers 30a to 30e is formed by thickly covering an elastic body 32 made of rubber or the like around the roller cylinder 31, and fixing rings 33a and 33b are press-fitted and fixed at both ends, These are inserted into the peripheral surface of the cylindrical feed shaft 34, and fixed rings 33a and 3a are fixed by screws 35a and 35b.
3b is screwed and fixed to the feed shaft 34 at different positions by 180 °.

In this way, each feed roller 30a-30e
Since a and 35b are screwed and fixed at two points at 180 ° different positions at both ends of the feed rollers 30a to 30e, the feed rollers are 180 ° at both ends as is generally done in the past. Compared with the case where two different places are fixed at a total of four places, the screw fixing work is reduced and the balance adjustment between each screw is not necessary. In addition, it is possible to arrange multiple feed rollers 30a to 30e. On the contrary, the installed printing apparatus can obtain high accuracy and the effect that the paper feeding can be smoothly performed.

Although not shown, the feed shaft 34 is a rotating side plate.
The feed shaft 34 is slidable within the range of the guide shaft hole by being inserted into a pair of left and right elliptical guide shaft holes formed in 55 (see FIG. 4) and being retained by a bush. It is arranged. Further, as shown in FIG. 2, the feed shaft pressing rings 42 are attached to the feed shaft 34 at equal intervals at positions between the feed rollers 30a to 30e and both end positions. As can be seen from FIG. 3, the feed rollers 30a to 30e are fixed to the platen by the plurality of leaf spring members 43 arranged at equal intervals in the axial direction of the feed shaft 34 on the front die cast portion 61 of the movable lid member 6. The pedestal 18 is urged to come into pressure contact with the feed roller pressure contact portion 18a.

By the way, the number of the feed rollers 30a to 30e is different from the number of the line thermal heads 20a to 20d, and at the position where the line thermal heads 20a to 20d overlap each other, one of the feed rollers always corresponds. There is. In this way, the feed rollers 30a to 30e are arranged because the line thermal heads 20a and 20b are added to the roll paper 51 at positions where the line thermal heads 20a to 20d overlap.
This is because the load due to the contact pressure of a to 20d may be applied, and it may not be possible to uniformly feed the paper. Therefore, the paper may be reliably fed even at such a position.

The one end of the feed shaft 34 protruding from the turning side plate 55 has a fourth
As shown in the figure, the feed pulley 36 is fixed,
The feed pulley 36 is connected to a feed motor 39 via a timing belt 37 and a reduction gear mechanism 38.

The tension of the timing belt 37 is adjusted by the tension adjusting mechanism 40, and the timing belt 37 is stretched around the feed pulley 36 via an idle gear 41 that changes the load direction applied to the feed shaft 34.

As shown in FIG. 3, a circuit board 45 and the like are arranged on the rear side metal plate portion 62 of the movable lid member 6, and shielded by a decorative plate 46 so as not to be exposed to the outside when the movable lid member 6 is opened. Has been done. A paper guide unit 47 is attached to the decorative plate 46, and the paper guide unit 47 is provided with a paper empty sensor 48 including a micro switch.

An operation panel 63 for the enlarged print 1 is provided on the upper surface of the movable lid member 6 as shown in FIG.

The fixed base 5 and the movable lid member 6 are, as shown in FIG.
The rotating plate side 55 fixed to both sides of the inner surface of the movable lid member 6 is rotatably attached to the rotating support shaft 54 planted near the rear end of the fixed side plate 81 fixed to the fixed base 5. Are connected to each other.

On the support plate 21 (see FIG. 9) which is integrally extended outward from the fixed side plate 81 and is raised, an air damper is provided near the front end.
One end of 23 is swingably supported on the pin 22. The other end of the air damper 23 is swingably supported by a pin 24 planted near the rear end of the rotating side plate 55. Therefore, the rotating side plate 55 is provided with a rotational force that causes the normal to rise upward about the rotating support shaft 54 due to the extension elastic force of the air damper 23.

A support shaft 82 is planted in the fixed side plate 81 as shown in FIG. 9, and a swing lever 83 is swingably pivotally attached to the support shaft 82. Then, as shown in FIG. 8, the swing lever 83 is rotated around the support shaft 82 in a clockwise direction by a tight coil spring 86 which is attached to the swing lever 83 at one end and to the fixed side plate 81 at the other end. It is biased to rotate (in FIG. 8). The rotation of the rocking lever 83 due to the elastic force of the coil spring 86 is regulated at a predetermined position by a stopper pin 81a implanted in the fixed side plate 81. Further, the rotation of the swing lever 83 against the elasticity of the coil spring 86 is also regulated at a predetermined position by the stopper pin 81b planted in the fixed side plate 81, as shown by the alternate long and short dash line in FIG. It has become.

One end of an operating rod 84 is fixed to the lower end of the swing lever 83, and a grip ball 84a is attached to the other end of the operating rod 84.

Further, on the upper end side of the swing lever 83, a cam plate 87 and a cam member 88 fixed to the inner surface side of the turning side plate 55 (see FIG. 9).
The pin 85 that engages with the
A pressing piece 83a, which is a bent piece, is formed at the upper tip of the character shape. The pressing piece 83a can be engaged with a lid opening detection sensor 89 which is a micro switch attached to the rotating side plate 55.

The cam plate 87, as shown in FIGS. 10 (a) and (b),
It is formed of a plate body provided with a step portion in the middle, and a cam surface 87a that engages with the pin 85 and a locking piece 87b are provided on the upper end surface. Further, the cam member 88 has a lower end surface with an inclined cam surface.
The cam plate 87 is integrally formed by welding or the like on the inner surface (the left side surface in FIG. 10B) of the cam plate 87. The cam plate 87, whose lower portion is fixed to the outside of the rotating side plate 55 with screws or the like, extends inside the rotating side plate 55 through a through hole 55a formed in the rotating side plate 55 by bending the upper portion. Has been done. A cam member fixed to the inner surface of the upper part of the cam plate 87
88 is located inside the turning side plate 55.

On the other hand, the image reading unit 2 is, as shown in FIG.
When the document 2a is opened, the document is placed on a document table (not shown), the lid member 2a is closed again, and the reading switch 2b is depressed,
An image of a document is read as digital image information by a built-in line image sensor (not shown). The image reading unit 2 can transfer the read digital image information to the enlargement printing unit 1 via a cable (not shown).

Next, the operation of the printing apparatus of this embodiment configured as described above will be described.

First, in order to set the roll paper 51 on the enlarged print unit 1, the grip ball 84 of the operating rod 84 protruding to the lower side of the fixed base 5 is used.
Grab a and pull it toward you (counterclockwise in Figure 8). Then, as shown in Fig. 11, the swing lever is
83 rotates around the support shaft 82 against the elastic force of the biasing spring 86,
Pin 85 moves. As a result, the pin 85 slides down the cam surface 87a of the cam member 87, and as shown in FIG. 11, the lid opening detection sensor 89 escapes the regulation of the pressing piece 83a and detects the opening of the movable lid member 6. When the pin 85 finally separates from the cam surface 87a of the cam member 87 as the pin 85 continues to move, the movable lid member 6
The movable lid member 6, which has been unlocked from the fixed base 5 and lost the regulation by the pin 85, rotates together with the rotation side plate 55 about the rotation support shaft 54 due to the extension elasticity of the air damper 23,
The movable lid member 6 is opened. After this, the swing lever 83
When the user abuts the stopper pin 81b and cannot rotate further, and the user releases the operating rod 84, the swing lever 83 is released.
Is returned by the elasticity of the coil spring 86 to the position where it abuts the stopper pin 81a around the support shaft 82.

At the open position of the movable lid member 6, the line thermal head 20
a to 20d and feed rollers 30a to 30e are platen rollers
10a to 10d and the dummy platens 11a to 11d are largely separated from the platen pedestal 18 so that the paper roll 50 can be stored in the paper roll storage portion 5a.

In order to store the paper roll 50 in the paper roll storage portion 5a, as shown in FIG. 5, first, the central convex shafts 52a of the rim portions 52 at both ends of the paper roll 50 are arranged at the left and right end positions of the paper roll storage concave portion 5a. The upper end surface of the supporting plate 53 is placed within a certain range, and then the paper roll 50 is pushed backward while rolling.
Then, when the central convex shaft 52a comes to the position of the bearing concave portion 53a of the support plate 53, the paper roll 50 falls into the paper roll accommodating concave portion 5a by its own weight, and the central convex shaft 52a has the bearing concave portion 53a.
And the paper roll 50 is set at a predetermined position. In this way, the paper roll 50 can be set only by placing it in a position within an allowable range and then pushing it back.
Can be stored very easily.

From the set paper roll 50, the leading edge of the roll paper 51 is pulled out and stretched along the platen rollers 10a to 10d, the dummy platens 11a to 11d and the platen pedestal 18, and the fixed blade member 71 and the rotary blade of the rotary cutter 7 are set. It can be inserted into the member 72 and pulled out to the front side of the lower surface of the enlarged print unit 1. By doing this, roll paper
51 is ready to be set in the enlarged print section 1.

Further, when the movable member 6 is in the open position, the platen roller 10a
~ 10d, Dummy platen 11a ~ 11d, Line thermal head 2
Since 0a to 20d and the feed rollers 30a to 30e are exposed to the outside, maintenance such as repair and replacement can be easily performed. Furthermore, by removing the decorative plate 46, maintenance of the circuit board 45 and the like can be easily performed.

When the front side of the movable lid member 6 is pressed from above in a state in which the roll paper 51 can be set, the movable lid member 6 rotates the rotation side plate 55 around the rotation support shaft 54 against the elasticity of the air damper 23. Closed by. In the process of closing the movable lid member 6,
The cam surface 88 of the cam member 88 attached to the back surface of the cam plate 87
The pin 85 is moved by a to a position where it does not collide with the cam plate 87 (the swing lever 83 is rotated against the elastic force of the coil spring 86), and then the pin 85 crosses over the cam surface 88a of the cam member 88. , And stops at a position where it comes into contact with the cam surface 87a of the cam plate 87 as shown in FIG. In this state, the movable lid member 6 is not completely closed, and the user further operates the operating rod 84.
By holding the grip ball 84a and pushing it strongly downward,
The pin 85 pushes up the cam surface 87a of the cam plate 87 and stops at a position where it hits the locking piece 87b, and the movable lid member 6 is fixed to the fixed base 5
Locked against and completely closed. In this state, the lid closing detection sensor 89 detects the closing of the movable lid member 6 by the returning movement of the pressing piece 83a of the swing lever 83, and the paper empty sensor 48 causes the roll paper 51 to move by the expansion of the roll paper 51. Detect the presence.

As described above, the line thermal heads 20a to 20d and the feed rollers 30a to 30e are pressed against the platen rollers 10a to 10d and the platen base 18 via the roll paper 51, and the roll paper
51 is set in the enlarged print section 1.

Next, when the lid member 2a of the document reading unit 2 is opened, the document is set on the document table, the member 2a is closed again, and the reading switch 2b is pressed, the line image sensor built in the document reading unit 2 is opened. The original is scanned and the digital image information of the original is transferred to the enlargement printing unit 1 via a cable (not shown).

In the enlargement printing unit 1, the digital image information transferred from the document reading unit 2 is temporarily stored in a page memory (not shown).
Remember and keep on top.

When the roll paper 51 is set in the magnifying print unit 1 and the digital image information of the original is stored in the page memory and the start switch provided on the operation panel 63 of the magnifying print unit 1 is pressed, the printing operation starts. It

When the printing operation is started, the feed motor 39 is rotated, and the feed shaft 34 is rotated via the reduction gear mechanism 38, the timing belt 37 and the feed pulley 36. As a result, the feed rollers 30a to 30e rotate and the roll paper 51 is fed. At the same time, the line thermal heads 20a to 20d are driven based on the digital image information stored in the page memory, and the roll paper 51 is sequentially printed. At this time, the line thermal heads 20a-2
It goes without saying that 0d is driven in consideration of the phase difference and the driving order based on the position and direction in the sub-scanning direction.

The printed roll paper 51 discharged from the magnifying print unit 1 is sent while hanging downward due to its own weight.
As shown in FIG. 13A, the leading end of the paper tray 3 attached to the support frame 4 reaches the paper tray 3. After this, roll paper
When the sheets 51 are sequentially ejected, the leading end of the paper tray 3 becomes the mouse-back portion 3b, so that the roll paper 51 can be sequentially folded on the paper tray 3 as shown in FIG. 13 (b). You can receive it.

When the printing for one page is completed, the driving of the line thermal heads 20a to 20d is stopped. Further, the feed motor 39 is further driven automatically and based on the support from the outside, so that it is provided between the positions of the line thermal heads 20a to 20d, which are print end positions, and the position of the rotary cutter 7, which is a paper cutting position. The drive is stopped after the paper is fed by the distance corresponding to the distance.

As a result, the print end position of the roll paper 51 comes to the paper cut position, and at this position the cutter motor 74 is energized to drive the rotary cutter 7, and the roll paper 51 is cut at the print end position. The cut end of the roll paper 51 falls from the enlarged print unit 1 and is captured by the paper tray 3.

In the above embodiment, the line print head is described as a line thermal head, but it goes without saying that any type of line print head may be used.

〔The invention's effect〕

As described above, according to the present invention, in a printing apparatus in which a plurality of line print heads are arranged in a zigzag pattern, a plurality of platen rollers are arranged in a zigzag pattern corresponding to the plurality of line print heads, and the cross section is reversed. By arranging multiple dummy platens formed of U-shaped plates alternately with the platen roller in a staggered pattern, the frictional force can be reduced without the need for high precision, and wrinkles on the print paper can be prevented. There is an effect that the feeding of the print paper can be stabilized while being prevented.

[Brief description of drawings]

FIG. 1 is a perspective view showing a printing apparatus according to an embodiment of the present invention, FIG. 2 is a fragmentary plan view showing an enlarged printing section of the printing apparatus shown in FIG. 1, and FIG. Sectional drawing which shows the internal structure of the enlarged print part shown in FIG. 2, FIG. 4 is a side view of the principal part of the enlarged print part shown in FIG. 2, and FIG. 5 is the enlarged print shown in FIG. 6 is an exploded perspective view showing the structure of the platen roller and the dummy platen shown in FIG. 2, and FIG. 7 is shown in FIG. And FIG. 8 is a side view showing an essential part of the opening / closing mechanism of the enlarged printing section shown in FIG. 1, and FIG. 9 is a drawing showing the main part of the opening / closing mechanism shown in FIG. 10 (a) and 10 (b) are front views showing the parts, and the cam plate and the cam shown in FIG. Fig. 11 is a front view and a side view showing the material, Fig. 11 is an operation mode diagram of the main part of the opening / closing mechanism shown in Fig. 8, and Fig. 12 is another operation of the main part of the opening / closing mechanism shown in Fig. 8. Aspects, FIGS. 13 (a) and 13 (b) are views for explaining the action of the paper tray shown in FIG. In the figure, 1 ... Enlarged print section, 2 ... Original reading section, 3 ... Paper tray, 4 ... Support frame, 5 ... Fixed base, 5a ... Paper roll storage section, 6 ... Movable lid member, 7 ... Rotary cutter, 10a-10d ... Platen roller, 11a-11d ... Dummy platen, 18 ... Platen base, 20a-20d ... Line thermal head, 23 ... Air damper, 30a-30e ... Feed roller, 34 …… Feed shaft, 39 …… Feed motor, 48 …… Paper empty sensor, 50 …… Paper roll, 51 …… Roll paper, 52 …… Rims on both ends, 52a …… Center convex shaft, 53 …… Support plate Body, 53a …… Recessed bearing, 54 …… Rotating support shaft, 55 …… Rotating side plate, 81 …… Fixed side plate, 83 …… Swing lever, 84 …… Operating rod, 85 …… Pin, 87 …… Cam plate, 88 ... Cam member, 89 ... Lid open sensor.

Claims (1)

[Claims] 1. A printing apparatus in which a plurality of line print heads are arranged in a zigzag pattern, and a plurality of platen rollers arranged in a zigzag pattern corresponding to the plurality of line print heads, and a plate body having an inverted U-shaped cross section. And a plurality of dummy platens arranged in a zigzag pattern alternately with the platen roller.