JPS62275765A - Printer - Google Patents

Abstract

PURPOSE:To miniaturize an entire system and prevent the generation of jamming by providing a recording paper stocker and a reversing stand which holds the recording paper temporarily almost in parallel in close proximity to a holder on a transportation route for the recording paper to be discharged from a platen and again feeding the recoding paper sent to the reversing stand by a paper route selector toward an insertion position for the platen. CONSTITUTION:When a selector switch of one side printing and perfecting printing is set OFF, only the one side printing is performed and when the switch is set ON, the perfection printing is carried out. since a holder 9, a reversing stand 11 and a stocker 10 are provided almost in parallel all close to each other, the insertion direction of two recording papers 12 from the holder 9 and the reversing stand 11 to an insertion position (a), and the discharge direction of two recording papers 12 to the reversing stand 11 and the stocker 10 from a discharge position (b) almost coincide with each other. In addition, as a change in the direction of the recording paper 12 at the reversing stand 11 is minimized, the transportation route of the recording paper is simplified, and at the same time, the movable range of a selector disk 25 at a paper feed route selector 23 has only to be small. Thus the selector 23 need not be of large size and enables recording paper to be automatically reversed to print the both sides of said paper.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention Field of Industrial Application The present invention relates to a printing device for printing on recording paper.

2. Description of the Related Art Normally, when printing on both sides of recording paper, the recording paper is taken out after printing on the front side of the recording paper is completed, and then the recording paper is set in the printing device again. At this time, the recording paper must be turned over, reversed vertically, and then set again, which is a complicated operation.

Therefore, there are conventional devices in which the recording paper, once printed on, is automatically reversed and set again, and printing is performed on both sides of the paper. The principle of this type of structure is that the recording paper that has been printed and sent out from the platen is temporarily held in a stand, and from this stand the recording paper is sent back to the platen to print on both sides of the paper. The recorded paper is stored in the stocker. More specifically, the recording paper held on the stand is conveyed so that its printed side is in contact with the platen.

Furthermore, whether the conveyance path of the recording paper sent out from the platen is to be placed on the stand side or on the stocker side is selected by a switching device, and this switching device is electrically controlled by a control circuit.

Problems to be Solved by the Invention The recording paper that has been printed and sent out from the platen has two transport paths. In particular, when the recording paper is fed to the stand side, it is necessary to feed the recording paper toward the platen again so that the printed side comes into contact with the platen. This has the disadvantage that the conveyance path for the recording paper becomes complicated, and the mechanism therefor becomes complicated as well. Further, as the switching device for switching the conveyance path of the recording paper has a large movable range, a large-scale device is required.

This also has the disadvantage of increasing the size of the entire device.

The present invention has been made in view of these points, and it is an object of the present invention to provide a printing device that can automatically reverse recording paper and print on both sides of the recording paper without using a complicated mechanism or large-scale device. With the goal.

Means for Solving the Problems A platen into which recording paper sent out from a holder is inserted from an insertion position and wound thereon, and a print head for printing on the recording paper wound around the platen are provided. Then, on the conveyance path of the recording paper discharged from the output position of the platen, a stocker for stocking the recording paper and a reversing stand for temporarily holding the recording paper are placed close to the holder and arranged approximately parallel to the holder. establish. Then, a paper path switching unit is provided to switch the conveyance path of the recording paper to either the stocker or the reversing stand, and re-feeding the recording paper sent to the reversing stand towards the insertion position of the platen again. A section will be established.

Therefore, the holder, inversion stand and stocker are
All of them are placed in close proximity and approximately parallel to each other. Therefore, there are two ways to insert the recording paper into the platen insertion position from the holder and the inversion stand, and two ways to eject the recording paper from the platen ejection position to the inversion stand and the stocker. They almost match each other. Further, changes in the direction of the recording paper in the reversing stand are also reduced. For this reason, the conveyance path of the recording paper is simplified, and the entire mechanism therefor is also simplified. At the same time, the movable range of the paper path switching section may be small, and there is no need for a large-scale paper path switching section.

Embodiment of the Invention An embodiment of the present invention is shown in FIGS. 1 to 4 (a) and (b).
The explanation will be based on. Printer body 1 not shown in its entirety
A platen 2 is provided in parallel therein.

A print head 3 is provided facing the platen 2, and the print head 3 is held so as to be movable along the axis of the platen 2. Further, within the printer main body 1, a paper guide 4 is disposed below the platen 2 and along the outer shape of the platen. Furthermore, a pinch roller 5 is in contact with the platen 2 below, and a pail roller 6 is in contact with the platen 2 above the platen 2 in the same axial direction.

On the other hand, an automatic paper feeder 7 is installed on the printer main body 1. That is, a frame 8 is provided which is directly attached to the printer main body 1, and this frame 8
includes a holder 9, a stocker 10 and an inversion stand 11.
are mounted in close proximity to each other in a substantially parallel state.

The holder 9 is a housing-like member that holds a plurality of sheets of recording paper 12, and has a backing 13 fixed to the frame 8.
The upper part is rotatably attached to the The lower part of the holder 9 is connected to the back plate 13 via a spring 14. Further, in the rotating direction of the holder 9 which is pushed by the spring 14 and rotates, the holder 9 comes into contact with the recording paper 12 held by the holder 9 and moves the recording paper 12 into the insertion position a of the platen 2. A feed-out roller 15 is provided. Furthermore, a separator 16 is attached to the lower end of the holder 9 to separate the uppermost recording paper 12 held by the holder 9 from the other recording papers 12. Next, the input stocker 1o is a housing-like member that stores the recording paper 12 sent out from the discharge position of the platen 2. A pair of paper ejection rollers 17 are disposed near the bottom of this stocker 10 to send the recording paper 12 sent out from the ejection position to the stocker 10.
1 is a plate-shaped member disposed between the holder 9 and the stocker 10. As shown in FIG. The inversion stand 11 has an upper part rotatably attached to a back plate 18 fixed to the frame 8, and a lower part connected to the back plate 18 via a spring 19. The lower end of the reversing stand 11 is bent in the direction of the insertion position a,
A resupply roller 20 as a resupply section is arranged in contact with this bent portion. In addition, this re-supply roller 20
A paper discharge roller 21 is arranged in contact with the paper discharge roller 21 . A communication surface 22 that communicates the discharge position of the platen 2 with the contact portion between the re-supply roller 20 and the paper discharge roller 21 is integrally formed on the frame 8.

A paper path switching unit 23 is disposed within the frame 8 to switch the conveyance path of the recording paper 12 from the discharge position of the platen 2.

That is, a pair of guide plates 24 are provided below the paper ejection roller 17, and the entrance thereof is directed toward the ejection position @b.
A switching plate 25 is rotatably attached to one lower end of the guide plate 24. The rotation range of this switching plate 25 is
This ranges from a position where the contact surface 22 is in contact with the contact surface 22 to a position slightly separated from the communication surface 22. A solenoid 26 for rotating the switching plate 25 is provided, and a paper path switching section 23 is configured here.

Next, the state of electrical connection between the printer main body 1 and the automatic paper feeder 7 is shown as a block diagram in FIG. It is connected to the. Similarly, those CPUs 27, etc. are connected to the CAl11 control circuit 32, the LF control circuit 33, the print head control circuit 34, etc. via the I10 block 31. It is connected to a solenoid control circuit 35, an automatic paper feed control circuit 36, and an interface control circuit 37. In addition, for those OA control circuits 32, etc., the switches (S, W) 38 for setting whether to perform single-sided printing or double-sided printing are similarly connected to the above-mentioned I
10 blocks 31 are connected to each other. Here, the CA control circuit 32 is connected to the CA motor 39, the LF control circuit 33 to the LF motor 40, and the print head control circuit 34 to the print head 3. Further, the solenoid control circuit 35 and the automatic paper feed control circuit 36 are connected to the solenoid 26 of the automatic paper feed device 7.
and a motor 41 for automatic paper feeding. Further, the interface control circuit 37 is connected to a host computer 42.

In such a configuration, the printing operation will be explained based on the flowchart shown in FIG. First, if the 6SW 38, which detects whether the 5W 38 is turned on or not, is OFF, printing is performed on only one side. That is, the recording paper material 2 held by the holder 9 is delivered to the insertion position a of the platen 2 by the delivery roller 15. The paper is then guided between the platen 2 and the paper guide 4, printed by the print head 3, and discharged from the discharge position.

At this time, the switching plate 25 is in contact with the communication surface 22 and closed, so that the recording paper 1 ejected from the ejection position Wb
2 is guided to the stack 10 from between the paper ejection rollers 17,
Stocked here. In this way, one-sided printing is completed.

On the other hand, if 5W38 is ON, double-sided printing is performed. First, in response to a command from the CPU 27, the solenoid 26
is energized, and the switching plate 25 is opened. Then, the recording paper 12 discharged from the discharge position through the same process as in the case of single-sided printing is guided on the connecting surface 22 and sent out from between the re-supply roller 2o and the paper discharge roller 21 to the reversing stand 11. and is held temporarily. This inversion stand 11
The recording paper 12 held in the
and is inserted again into the insertion position a. At the same time, the switching plate 25 is closed in response to the command from the CPU 27. Here, the recording paper 12 inserted again into the insertion position a
The printed side of the platen 2 is in contact with the platen 2, so that the printing head 3 prints on the non-printed side. In this way, both sides of the recording paper 12 are printed, and after that, the same process as in the case of single-sided printing is performed, and then the paper 12 is transferred to the stocker 12.
will be stocked in Note that when printing on the back side of the recording paper 12, the vertical direction of the recording paper 12 is opposite to the front side. Therefore, in the case of backside printing, one page's worth of information stored in a print buffer (not shown) is completely inverted and printed on the recording paper 12. FIG. 4 shows such a recording paper 12
FIG. 4(a) shows the case of front side printing, and FIG. 4(b) shows the case of back side printing.

Thus, the holder 91, the reversing stand 11, and the stocker 10 are all placed in close proximity and in a substantially parallel state. Therefore, the recording paper 12 can be inserted in two ways from the holder 9 and the reversing stand 11 to the insertion position a, and the recording paper 12 can be inserted in two ways from the ejection position to the reversing stand 11 and the stocker 10. The discharge directions are almost the same.

Furthermore, changes in the direction of the recording paper 12 on the reversing stand 11 are also reduced. For this reason, the conveyance path of the recording paper 12 is simplified, and the entire mechanism therefor is also simplified. At the same time, the movable range of the switching plate 25 in the paper path switching section 23 may be small, and the paper path switching section 23 does not require a large-scale device. Therefore, by automatically reversing the recording paper and printing on both sides without using complicated mechanisms or large-scale equipment, parts and manufacturing costs can be reduced, and the entire device can be reduced. It can be downsized and the occurrence of jams can be reduced. Furthermore, since the mechanism is simple, maintainability is also improved.

Effects of the Invention The present invention provides a stocker for stocking the recording paper ejected from the ejection position of the platen and an inversion stand for temporarily holding the recording paper on the conveyance path of the recording paper ejected from the ejection position of the platen, which are arranged close to the holder so as to be approximately parallel to each other. A paper path switching unit is provided to switch the conveyance path of the recording paper to either the stocker or the reversing stand, and the recording paper sent to the reversing stand is directed again to the insertion position of the platen. The provision of a re-feed unit for sending out the recording paper simplifies the conveyance path for the recording paper, and the mechanism used for it is also simplified. Therefore, parts and manufacturing costs can be reduced, contributing to the miniaturization of the entire device and reducing the occurrence of jams. can be reduced, and
Maintainability can be improved, and furthermore, the conveying path of the recording paper is shortened, so that the printing time can be shortened.

[Brief explanation of the drawing]

Fig. 1 is a side view showing an embodiment of the present invention, Fig. 2 is a block diagram showing the electrical connection state of each part, Fig. 3 is a flowchart showing the printing process, and Figs. 4 (a) and (b). 2A and 2B are front and rear views of the recording paper showing printing directions on the front and back sides of the recording paper. 2...Platen, 3...Print head, 9...Holder, 1o...Stocker, 11...Reversing stand,
12... Recording paper, 20... Re-supply roller (re-supply section),
23... Paper path switching unit, a... Insertion position, b...
・Discharge location application Person: Tokyo Electric Co., Ltd. 1, j+',:,', 1-:I Agent Akira Aiki・'-1・-1 □ -1

Claims (1)

[Claims] A holder for holding a plurality of sheets of recording paper is provided, a platen for inserting and winding the recording paper sent out from the holder from an insertion position, and a print head for printing on the recording paper wound around the platen. The holder is provided with a stocker for stocking the recording paper on the conveyance path of the recording paper printed by the print head and discharged from the discharge position of the platen, and a reversing stand for temporarily holding the recording paper. A paper path switching section is provided, which is arranged close to the holder and substantially parallel to the holder, and switches the conveyance path of the recording paper to either one of the stocker and the reversing stand, and the paper path switching unit is provided so that the recording paper is fed to the reversing stand. A printing device characterized in that a re-feeding unit is provided for feeding out the recording paper again toward the insertion position of the platen.