JPS581582A - Mechanism for detecting switching-over in printing paper - Google Patents

Abstract

PURPOSE:To prevent misoperation by allowing the setting of a continuous printing paper only with change of a switch lever through the detecting section and the switching section so arranged to have a paper end sensor and the lever in common. CONSTITUTION:When a continuous paper 11 is set with a switch lever 3a turned to the position G, a paper end sensor 7a is turned ON and then turned OFF sensing the end of the paper, which is indicated with an alarm lamp. When a single sheet is used, with the switch lever 3a turned to the position H, the paper end sensor 7a is kept ON so that a switch lever 7b will stand on the same state as it would when the continuous printing paper 11 is set. When the continuous paper 11 is used again, it won't be set blocked by the switch lever 3a, when the lever 3a is located still at the position H.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a medium transport mechanism for a serial printer, and particularly to improvements in the printing paper type switching and paper end detection mechanism for continuous paper.

Recently, many printers such as computer terminals have been developed.
It has been put into practical use. The printing paper for these printers is often 2-year slips and delivery slips. Single sheets are used by being wrapped directly around the platen member from the paper guide, but continuous sheets stored in the paper feed section are passed through the paper guide and wrapped around the platen member by setting a paper feed hole in the sprocket of the media transport section. It is used wrapped.

There are two types of medium transfer: push type and pull type, and the present invention is applied to the former case.

Hereinafter, the conventional method will be explained using a wire tod printer as an example, with reference to FIG. m1 and FIG. 3. FIG. a side view showing a media transport mechanism;
Figures 43(a) to 43 are circuit diagrams showing the opening and closing of the switch circuit when using single sheets and continuous paper. In the figure, 1 is the switching section, 2 is the changeover switch, 2a is the push button, and 3 is the changeover lever. .

4 is a tongue piece, 5 is a shaft, 6 is a detection unit, 7 is a paper end sensor, 8 is a presser lever, 9 is an 11-item frame lO is a platen, 11 is a printing paper, 12 is a medium transfer, '4i, 'p,
, 12a-12h7 sub-rotor, j-1 soct gobeper presser plate, 13 is carrier, 14 is paper guide, 15 is guide shaft, 16 is feeder, j.

17 is a heald, 19 is a motor, 20 is an Inokuriphon cassette, 20a is an ink ribbon, and 21 is a print head.

The wire tod printer is shown in Figure 1.

It has a frame 9, and the frame 9 has a platen 10.
is rotatably supported. A printing paper 11 is wound around the platen 10, and the printing paper 11 is sent in the direction indicated by the arrow in the figure by sprockets 12a, 12b, etc. On the other hand, the front of the platen 10.

That is, in the lower part of the figure, a carrier 13 is provided parallel to the platen 10 and is slidably fitted to the feed shaft 15, and the carrier 13 is also provided with a feed screw parallel to the platen 10. I have met 16 and 4 times. Is the feed screw 16 the belt 17f? 'i is connected to the motor 19 through
"C. The carrier 13 can be moved in the directions of arrows C and I in the figure.

Carrier 13f is loaded with ink ribbon cassette 20, and cassette 20ζ is loaded with endless ink ribbon 2.
A part of 0a is built in so that 14 is output to Latin 10 fMIJ. 7: The print head 21 is installed in the Yaria 13 in a manner surrounded by an ink ribbon cullet 201, and the print head 21 is provided with a plurality of print magnets to form prints by the driver 11. ing. Regular printing mug, r7to, 16 to 2 pieces
There are four.

Further, as shown in FIG. 2, the medium transport mechanism is provided with a detection 96 consisting of a paper end sensor 7 and a presser lever 8 at the right end of the rear end of the side frame 9 in the drawing. A switching unit 1 that is operated when switching between single sheets and continuous paper 11 is installed outside the center, and the switching unit 1 is connected to the side frame 9 by a shaft 5 provided in the center.
a switching lever 3 rotatably supported by a switching lever 3;
It consists of a tongue piece 4 fixed to the lower end of the frame and a changeover switch 2 attached to a door frame 9. Platen 1
0 is located close to the pressure end in the front view of the side frame 9, and a bar guide 14 is located from below the platen 1O to the right in the figure, and a medium transfer cap 12 is located behind it to the right in the figure. Both are supported by left and right side frames 9.

When using continuous paper 11, the detection unit 6 passes the paper 11 between the paper end sensor 7 and the stacking lever 8,
ll, press the push button (not shown) on the paper end sensor 7 to set the paper end sensor 7 to the OI state, and when the continuous paper 11 runs out and the end passes the detection section 6, the paper end sensor 7 When the press button is pressed, the paper end warning lamp lights up. At this time,
Switching @i is at a position where the switching lever 2 uses the continuous paper 11, that is, at position E in the figure.

Therefore, the changeover switch 2 is in the OFr' state.

3(a) and 3(b) show a closed circuit of the paper end sensor 7 and the changeover switch 2. FIG. Changeover switch 2
Both Jji+kura are o ii'k', and the paper end sensor 7 is ON, OL! 1F) Thus, the presence or absence of continuous paper 11 is detected. Use a single ticket - "If 1
Since there is no need to detect the end of the paper with the paper end sensor 7, it is necessary to always keep the circuit in the same state as when the continuous paper 11 is used, as shown in FIG. 3 fC). For this purpose, when the switching lever 3 of the switching unit 1 is rotated to the position F in FIG. With this configuration, when the print head 21 is activated, the print paper IH on the platen 1O shown in FIG. Printing is performed, and the print/rad 21 prints on the printing paper 11 while moving in the direction of the arrow along with the carrier 13. - When the printing for the character is completed, the medium $ feed s12 shown in FIG. 2 is driven to feed the line feed, and the Jfr push-cover printing paper 11 is transferred in the direction indicated by the arrow T. That is, the printing paper 11 is stored in a paper feed section (not shown), and its leading edge passes between the paper end sensor 7 of the detection section 2 and the presser lever 8, as shown in FIG. Set the feed hole in the subrocket of part l2, and attach the paper holding plate 12C.
The paper is then held down by the paper guide 14, wound around the flatten 10, and transferred from above the flatten 10 to the rear part of the printer, that is, the above-mentioned arrow point, by a line feed or the like.

At this point, when the printing paper 11 stored in the paper feed section is used up and the end of the printing paper 11 passes the detection section 6, the printing paper that was between the paper end sensor 7 and the presser lever 8 is removed. When the paper 11 runs out, the paper end sensor 7 operates and the paper end notification lamp lights up, so that the continuous paper 11 can be replenished.

However, in this method, the LJO exchanger and the extractor 6 are separated, so the operator often forgets to press the lever and makes a mistake.For example, two microswitches are used. There are many parts that need to be changed, such as <,'4Jt
It had the disadvantage of being sloppy, and commercialization was desired.

The purpose of the present invention is to solve the above-mentioned problems, and therefore, a media detecting section is provided with an improved media transporting section for transporting the printing paper, and a guide for the printing paper is provided. It consists of a perper guide, a platen member around which the printing paper is wound and printing is performed, a switching section that switches the type of printing paper, and a detection section that detects the paper end of the printing paper. The medium transport mechanism is characterized in that the medium transport section ζ is provided with the medium detecting section, and the medium detecting section C is provided with a printing paper switching lever.

By doing so, operational errors can be prevented and a simple mechanism can be obtained.

The -5A embodiment of the present invention will be explained below with reference to Figs. 4 and 5. Fig. 4 is a side view showing the -5A embodiment of the present invention, and Fig. 5 is a plan view of Fig. 4. It is a diagram.

In the figure, +1a is the switching part, 3a is the switching lever, 5a is the shaft,
6a is a detection section, 7a is a Baber end sensor, 7b is a switch lever, and 12C is a paper pressing plate. Also the first
Individual diseases that are the same as those in the figure and FIG. 2 are indicated by the same symbols.

-7- As shown in Figs. 4 and 5, the structure has a detection part 6a and a switching part 1a attached to the right end in the rear view of the medium transfer part 2, and a paper end sensor 7a and a switching part 1a. The cover of the switch lever 7 and the shaft 5a are fixed for printing, and the switch lever 7b serves as an armature for switching the paper end sensor 7a. Switching lever 3
a is at the position shown in the figure with the axis 5a% center [G and the position ft can be switched to the position H shown by the two-dot chain line, and at this time the switch lever 7b turns the switch 7,000 of the paper end sensor 7a OFF and ON. It is arranged like this. Furthermore, when the switching lever 3a is in the position fiG, the tip of the switch lever 7b protrudes above the paper transport surface,
The presser plate 12C of No. 2 escapes from this part. When the continuous printing paper 11 is set in the medium transport section 12, the tip of the switch lever 7b is pushed down to the printing position, the paper end sensor 7a is turned ON, and the printing paper 1 is pushed down.
When l runs out, it returns to its original position -8-11 and the paper end sensor 7ai becomes OFF.

Therefore, the paper end sensor 7a and the switch lever 7b are shared by the detection section 6a and the switching lever 1a.

With such a configuration, the switching lever 3a is moved to the position (
When the continuous paper 11 is set, the paper end sensor 7a is activated and turns ON, and the OIi"F alarm lamp is displayed due to the paper end, so the printing paper 1
You can replenish 1. When using a cut sheet, the switching lever 3a is switched to position H, and by keeping the paper end sensor 7a in the ON state, the switch lever 7b is placed in the same state as when the slip printing paper 11 is set. Next time, when using the continuous printing machine 1l, even if an attempt is made to set the paper 11K while the switching lever 3ai is in position 12, the switching lever 3a prevents the paper from entering, so no operator error occurs.

As mentioned above, according to Akira, the detection part and the switching 7F
- fjlt is the paper end sensor and Swiss tile lever. I
-n Kitagawacho A Toro tr-i 4k1 day Uraichig
When setting rl paper, the switching lever must be switched before it can be set, which reduces operator errors and
This has the effect of preventing this, and since the use of parts has been reduced, it has the effect of improving costs. Furthermore, a switching detection mechanism is installed in the media transport section, so it is possible to always detect near the feed hole according to the rij size of the paper.
This has the effect of preventing the occurrence of paper sagging.

[Brief explanation of the drawing]

Fig. 1 is a plan view illustrating a wire tod printer to which the present invention is applied, Fig. 2 is a side view showing the medium transport mechanism of Fig. 1, and Figs. Circuit diagram showing opening and closing of the switch circuit in one history of continuous paper, No. 4
The figure is a side view showing an embodiment according to the present invention, and FIG. 5 is a plan view of FIG. 4. 1. la is the switching part, 2 is the cutting pipe switcher, ! F# Yukaizai Cell Furnace, 8 is the 1st lever, 11 is the letter paper, and 12 is the medium transfer unit. 11- Figure 1

Claims (1)

[Claims] a medium transport unit that transports the printing paper; a paper guide that guides the printing paper; a platen member around which the printing paper is wound to perform printing; a switching unit that switches the type of printing paper; In a medium transport mechanism including a detection section for detecting a paper end of paper, the medium detection section is provided in conjunction with the medium transport section.
#This printing paper switching detection mechanism is characterized in that a printing paper switching lever is attached to the medium detection section.