JPS6189876A - Printer - Google Patents

Abstract

PURPOSE:To prevent a mistake about upper and lower sides in printing on the back side of a medium by an inverting operation, by providing a circular return guide on the downstream of a lower rear guide and a shutter guide which are provided on the downstream side of a printing mechanism. CONSTITUTION:When a medium 1 is inserted through an opening part, the shutter guide 8 is opened, and printing is conducted. When the leading end of the medium 1 is passed through a sensor 4d, an idle roller 12 clamps the medium 1, and a controlling guide 16 is opened. Printing is finished on detection of the trailing end of the medium 1 by a sensor 4a. When the trailing end of the medium 1 is detected by a sensor 4c, a feeding roller 11 and reverse rotation of a driving motor for a feeding roller are synchronized with each other to feed the medium 1 to a position for printing on the back side of the medium. A printing position of the medium 1 is set by a sensor 4b, then the shutter guide 8 is opened, and the printing action is repeated while feeding the medium in the direction of insertion.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a printing device that prints on the front and back sides of a medium from insertion to ejection of the medium.

[Conventional technology]

A conventional printing device will be explained with reference to FIGS. 2 to 4.

Each drawing is a side view. In the drawings, 1 is a medium, 2 is a stage for setting the medium, 3 is a stage guide upper for stabilizing the running of the medium, and 4 is a medium detection sensor, which is located at the leading edge of the medium. Detect the rear end. 5 is a feed roller for running the medium, 6 is an idle roller, γ is a rear guide lower that serves as a medium running guide, 8 is a shutter guide that can be opened and closed back and forth depending on the medium running state, 9 is a platen, and 10 is a This is a dot print head for printing on a medium 1 that is vertically movably supported.

According to the above configuration, the operation is such that when the medium 1 is first inserted through the opening formed by the stage 2 and the stage guide upper 3, the medium 1 reaches the position of the detection sensor 4 by the detection sensor 4. , and is sent to the printing position by the idle roller 6 and feed roller 5 as shown in FIG.

The shutter guide 8 is opened as shown in FIG. 3, and the dot print head 10 is lowered by a drive mechanism (not shown) to print on the medium 1.

Next, the dot print head 10 rises to the idle low 2
6 and feed roller 5 feed the medium 1 by the required amount, and the dot print head 10 descends again to perform printing.

The sensor 4 detects the trailing edge of the medium 1 by repeating the above printing operation.
After the dot printing head 10 is raised, the shutter guide 8 is closed, and the medium 1 is moved between the idle roller 6 and the feed roller 5. Discharge by reversing.

Next, when printing on the back side of the same medium 1, the operator turns over the ejected medium 1, re-centes it as shown in FIG. Complete printing.

[Problem that the invention seeks to solve]

According to the conventional technology described above, when printing on both the front and back sides of a medium, after printing on the front side, the medium and the printing device must be removed, and the operator must turn the medium over and reinsert it into the printing device. For this reason, if you turn the media over and place it in the wrong direction, the print on the front and back sides may be printed upside down.Furthermore, the media has to go back and forth on the travel path twice, which increases processing time. There was a problem.

[Means for solving problems]

The present invention provides a medium reversing mechanism in which a circular return guide is provided behind a rear guide lower and a shunter guide that continue behind the printing mechanism, and a control guide is arranged to be openable and closable in accordance with the return guide. It is characterized by

[Effect]

According to the above configuration, when a medium is inserted through the opening made up of the stage and the upper stage guide, the medium is first printed on the bottom side, and then the medium is turned over by the return guide and sent to the dot print head again. It can also be printed on the back side and discharged through the opening.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a side view of the present invention, FIGS. 5 to 8 are side views showing the sequence of operations, and FIG. 9 is a perspective view of the medium inverted.

In the following description, parts similar to those in the above-mentioned prior art will be described using the same reference numerals.

In the drawing, 1 is a medium, 2 is a stage for centering the medium, 3 is a stage guide upper for stabilizing the running of the medium, 4a, 4b, 4c, and 4d are detection sensors for the medium 1, and the leading edge of the medium 1 and detect the rear end. 5a is a feed roller for running the medium 1, 6a is an idle roller, 7 is a rear guide lower that serves as a medium running guide, 8
Numeral 1 is a leaf spring-like shutter guide which can be opened and closed back and forth depending on the running state of the medium 1, 9 is a platen, and 101' is supported by an i-dot printing hand so as to be movable up and down.

Furthermore, 5b+5cy5d, 5e are feed rollers 6b, 6 which are interlocked with the above-mentioned 5a by a motor not shown.
Reference numerals c, 6d, and 6e are idle rollers, 11 is a feed roller independent of the above-mentioned feed roller, and 12 is an idle roller.

Reference numeral 13 denotes a presser roller for stabilizing the shank guide 8 when the medium is running or when the no-yanta guide 8 is moving; 14 is a guide for stabilizing the running of the medium; The shunter guide 8 extends substantially along the extension line of the shunter guide 8. Reference numeral 15 denotes a return guide for reversing the medium 1, which has a circular shape.

Reference numeral 16 denotes a control guide that can be opened and closed depending on the length of the medium 1, and is rotatably supported around a fulcrum 17. 18 is a link that operates the control guide 16, 19 is a link connected to this link 18, 20 is a fulcrum of this link 19, 21 is a solenoid link, and 22 is a solenoid that is a power source for the link.

Next, the operation of this embodiment with the above configuration will be explained.

- First, as shown in FIG. 1, when the medium 1 is inserted through the opening formed by the stage 2 and the stage guide upper 3, when the medium 1 passes the detection sensor 4a, an idle roller clamp mechanism (not shown) The idle roller 6a claps the medium 1, and the feed roller 5a, which is interlocked by a motor (not shown), rotates, and the medium 1 is fed and placed in a printing position.

Next, as shown in FIG. 5, the shutter guide 8 is opened while being pressed by the presser roller 13 by a back-and-forth movement mechanism (not shown), and the dot print head 1 is opened by a vertical movement mechanism (not shown).
0 is lowered, and the gap between the platen 9 and the dot print head 10 is constant, and the medium 1 is printed by the 9 dot print head 10.
Print on the front side. Then, the dot print head 10
The dot print head 10 moves down and prints again. When this printing operation is repeated and the leading edge of the medium 1 passes the detection station 4d, the idle roller 12 clamps the medium 1 by the idle roller clamp mechanism. Here, the drive motor (not shown) of the feed roller 11 is in a locked state, so the leading end of the medium 1 is fixed. Therefore, when the solenoid 22 is driven, the control guide 16 rotates around the fulcrum 1T via the solenoid link 21 and the link 19. The trailing edge of the medium 1 is detected and printing is completed.

Then, the medium 1 is further fed, and when the detection sensor 4c detects the rear end of the medium 1 as shown in FIG.
di'j The drive motor of the feed roller 11 and the feed roller 5a are removed from the clamp.

The reverse rotation of the drive motors 5b, 5c, 5d, and 5e is synchronized to send the entire back side of the medium 1 to the position where printing is to be performed.

When the detection sensor 4b detects the leading edge of the medium 1, the shutter guide 8 moves forward as shown in FIG. 7, and the medium 1 is centered at the position where printing is to be performed.

At this time, the medium 1 is inverted at the same time (top and bottom, front and back), so the printing character control (not shown) produces characters that are vertically inverted as shown in FIG. 9, and the detection sensor 4b detects " Then, the leading edge of the medium 1 is detected and the position to be printed is set, and the medium 1 is fed.As shown in FIG. Then, when the detection sensor 4d detects the rear end of the medium 1, the solenoid 22 is opened and the control guide 16 is rotated about the fulcrum 17 by the re-centing mechanism of the solenoid 22 (not shown). The printing operation is further repeated, and after the detection sensor 4b detects the rear end of the medium 1, the necessary printing operation is further repeated, and then the printing operation is stopped as shown in FIG. 6. The dot print head 10 is raised and the medium 1 is ejected by the feed roller 5a and the idle roller 6a, completing the printing work on both the front and back sides.

〔Effect of the invention〕

According to the present invention described above, a circular return guide is provided at the rear of the printing mechanism, and a medium reversing mechanism is provided in which the control guide can be opened and closed to match the return guide, thereby printing can be performed on the front and back sides of the medium. In this case, the media inserted through the insertion slot of the printing device can be printed on the front side first, and then the media can be reversed by the media reversing mechanism to print on the back side. It is possible to eliminate the need for this process, and also to eliminate clumsiness such as errors in the vertical direction of the printing on the back side caused by the reversing operation. Furthermore, since manual work is eliminated, printing speed can be increased.

Furthermore, by providing a return guide mechanism, there is no limit to the length of the medium, and it is possible to print on both sides of a long medium, making it possible to print on both sides of the back of a person's back using a small printing device.

[Brief explanation of drawings]

Fig. 1 is a side view showing an embodiment of the present invention, Fig. 2 is a side view of a conventional example, Fig. 3 is a side view showing the operating state, Fig. 4 is a side view showing the operating state, and Fig. 5. is a side view showing the operating state of the present invention, FIG. 6 is a side view showing the operating state, FIG. 7 is a side view showing the operating state, and FIG. 8 is a side view showing the operating state.
FIG. 9 is a perspective view showing the inverted state of the medium. 1... Medium 2... Stage 3... Stage guide upper 4a, 4b, 4c, 4d... Detection sensor 5a, 5b, 5c, 5d, S
e---Feed rollers 6a, 6b, 6
c, 6 d, 5 e...Id/1zO
-Rough...Rear guide lower 8...Shutter guide 9...Platen 10...Don't print hand 11
...Feed roller 12...Idle roller 1
3... Presser roller 14... Guide 15... Return guide 16... Control guide Patent applicant Oki Electric Industry Co., Ltd. Agent Patent attorney Kanekura n 2 @ 1-Kyu 3-Ku 7 Country

Claims (1)

[Claims] 1. In a printing device in which a platen and a print head are arranged between a stage and a rear guide lower, a return guide is provided behind the rear guide lower, and a control guide is arranged along the return guide. printing device.