JPH0347895Y2 - - Google Patents

Description

[Detailed description of the invention] Γ Technical field of the invention This invention relates to a printer device for an information processing system, and involves the installation of a mark sensor installed in the paper path to read marks attached to the sides of printing paper. It's about structure.

Γ Background of the technology To automate printing processing by selecting print data output from an information processing device and setting its print position based on marks attached to printing paper inserted into the printer device. has traditionally been practiced. A printer device for performing such processing needs to be provided with a mark sensor in the printing paper feeding path to read marks on the printing paper inserted into the device. As such a mark sensor, a reflective photoelectric sensor is often used, and marks on the printing paper are read by a mark sensor provided at a fixed position while the printing paper is running.

Γ Prior Art and Problems Figures 1 to 5 show conventional mounting structures for such mark sensors. In the figure, 1 is the printing head, 2 is the platen, 3 is the printing section, 4,
5 and 6 are feed roller devices, 7 is a mark sensor,
8 and 9 are guide plates 11 forming a paper path 10;
is a photoelectric sensor for detecting the leading edge of paper. The feed roller devices 4 and 5 include pressure rollers 4a and 5a that are pivoted at fixed positions, and pressure rollers 4b and 4b that are urged by the pressure rollers 4a and 5a.
5b and the printing paper 12 between them and print it into the printing section 3.
It is intended to be sent to. Mark sensor 7 is the second
As shown in the figure, it is provided below the reference edge side of the paper path 10, and reads a mark 13 attached as shown in FIG. 3 on the side 12a of the back side of the paper 12 on the reference edge side.

4 and 5 are enlarged views showing the conventional mounting structure of the mark sensor 7. In the one shown in FIG. 4, an opening 14 is provided in the guide plate 9 and the mark sensor 7 is positioned, In the example shown in FIG. 1, a plate spring 15 provided opposite to the mark sensor 7 is used to positively bring the printing paper into contact with the mark sensor 7. Reference numeral 16 in FIG. 5 is a stationary member supporting the leaf spring 15, and reference numeral 17 is an opening provided in the guide plate 8.

When reading the mark 13 on the printing paper 12,
Although it is necessary to suppress variations in the position of the paper in the depth of focus direction of the mark sensor 7 as much as possible, there is a certain gap d between the guide plates 8 and 9 that form the paper path 10, and this gap d is It is necessary to make the size so that a sheet of the maximum allowable thickness that is inserted through the paper path 10 can pass smoothly, so in the structure shown in FIG. If marks are attached at a high density due to shaking movement, it may become impossible to read the marks, or the signal-to-noise ratio may deteriorate due to a decrease in the output of the mark sensor, resulting in unstable mark reading.

On the other hand, in the conventional structure shown in FIG.
Since the paper is brought into contact with the mark sensor 7, the paper does not change in the depth of focus direction of the mark sensor 7, but due to the contact resistance between the paper biased by the leaf spring 15 and the mark sensor 7 or the guide plate 9, the paper changes. Skew occurs, and if the paper is thin, the leading edge of the paper cannot pass through the contact area between the mark sensor 7 and the leaf spring 15, resulting in a paper jam.

Γ Purpose of the invention The present invention was created in view of the above-mentioned problems, and is a mark sensor mounting structure that can read marks on printing paper with high precision without causing paper skew or paper jam. Furthermore, the mark sensor can also achieve the function of the conventional photoelectric sensor 11 for detecting the leading edge of paper, thereby reducing the cost of the printer device. It is something.

Γ Structure of the Invention To explain using the reference numerals of the illustrated embodiments, the mark sensor mounting structure of the invention is as follows:
The end of the pressure roller 19b extends from the pressure roller 19a in the roller axial direction to form an extension portion 19c, and the mark sensor 7 and the above-mentioned extension portion are arranged opposite to this extension portion on the axial extension of the pressure roller 19a. The mark sensor 7 is provided so as to be slightly offset in the printing paper feeding direction from the contact line between the pressure roller 19a and the pressure roller 19b.

Γ Embodiment of the invention Figures 6 to 8 show a first embodiment of the invention. In the feed roller device 19 disposed immediately in front of the printing section 3, the lower roller 19a is mounted on a frame 20 and serves as a pressure receiving roller.
A pulley 22 is fixed to the shaft 21 of the pressure roller 19a and is driven by a rotational drive source (not shown). The pressure roller 19b is pivotally attached to the tip of an arm 24 that is supported by a frame by a pin 23, and is urged toward the pressure roller 19a by a spring 25, and the shaft 27 of the pressure roller 19b is the shaft of the pressure roller. 21 through gears 28 and 29, and is driven to rotate. Such a feed roller device 1
The structure of No. 9 is no different from that of conventional devices.

One end of the pressure roller 19b is the pressure receiving roller 1
9a, and this extension 1
A mark sensor 7 is arranged opposite to 9c. The mark sensor 7 is arranged slightly biased in the paper feeding direction (to the left in FIGS. 6 and 7), so that the paper sent to the printing section 3 is slightly shifted from the nipping position by the rollers 19a and 19b. The mark can be read at a position beyond .

The second embodiment shown in FIGS. 9 and 10 has a width shorter than that of the pressure roller 19b of the feed roller device 19, which has a structure similar to that of the first embodiment. The pressure receiving roller 19a is extended so that the paper is held between the extending portions 19c and 19d, and the mark sensor 7 is provided opposite to the overhanging portion of the extending portion 19c on the pressure roller side. , the paper is held in the vicinity of the mark sensor 7. Further, the mark sensor 7 is mounted slightly backward from the guide surface of the guide plate 9 so that the leading edge of the paper passing therethrough does not collide with the mark sensor 7, but in this second embodiment Here, sensor guides 26 are provided on both sides of the mark sensor 7, and the paper passing through the sensor section is guided by the top edges of the sensor guides 26 on the same plane as the guide surface of the guide plate 9. According to the structure of the second embodiment, the position of the paper passing through the mark sensor 7 portion can be regulated more accurately than that of the first embodiment.

According to the structure described above, the gap in the paper path at the mark sensor 7 portion is narrowed by the extending portion 19c of the pressure roller 19b.
9b moves up and down depending on the thickness of the paper being inserted, and the aperture amount changes depending on the thickness of the paper being inserted, so the focus of the mark sensor 7 on the paper passing through the mark sensor 7 portion It is possible to suppress positional fluctuations in the depth direction extremely slightly, and the pressure roller 19b is rotated by receiving a driving force from the shaft 21 of the pressure roller via gears 28 and 29, so that the extension of the pressure roller The section 19c is also driven in the paper feeding direction, and the extending section 19c is always maintained at a predetermined interval depending on the paper thickness without contacting the mark sensor 7 or the guide plate 9, thereby closing the paper path 10. There is no possibility that paper skew or paper jam will occur. Furthermore, this mark sensor 7
The mark sensor 7 is provided to be slightly biased in the paper feeding direction from the abutting portions of the marks 9a and 19b, and it is naturally possible to detect the leading edge of the paper with the mark sensor 7. This mark sensor 7 is responsible for the function of the conventional photoelectric sensor 11 for detecting the leading edge of a sheet of paper, which detects whether the sheet is being held, and the installation of the photoelectric sensor 11 can be omitted.

Γ Effects of the invention As is clear from the effects described in the above embodiments, the mark sensor mounting structure of the invention has the following effects:
It is possible to accurately read the mark by reducing the positional shift of the paper in the mark reading part as much as possible, and furthermore, it is possible to have a structure that does not apply load resistance to the paper in this mark reading part, Moreover, the structure can be such that the gap in the paper path at this mark sensor portion is automatically adjusted according to the thickness of the paper inserted therethrough. Therefore, by adopting the structure of the present invention, it is possible to perform automatic printing processing by a printer device accurately and without causing paper jams or paper skew, and it is possible to perform automatic printing processing by a printer device without causing paper jams, paper skew, etc., and to reduce the thickness of paper used for automatic printing processing. It can be achieved regardless of the degree. Further, according to the configuration of the present invention, since the sensor for detecting the leading edge of the paper can be omitted, there is also an effect that the cost of the printer device can be reduced.

[Brief explanation of the drawing]

Figures 1 to 5 are diagrams showing the mounting structure of a conventional mark sensor, in which Figure 1 is a side view showing the mounting position of the mark sensor, Figure 2 is a perspective view of the main parts,
FIG. 3 is a back view of the printing paper, FIG. 4 is a partially enlarged view showing the mounting structure of the mark sensor of the first conventional example, and FIG. 5 is the second conventional example. Figures 6 to 8
The figures show the first embodiment of the present invention, Figures 9 and 10.
The figures show a second embodiment of the present invention, in which Fig. 6 is a side view showing the mounting position of the mark sensor;
FIG. 9 is a front view of the feed roller device, and FIGS. 7 and 10 are enlarged side views of the mark sensor mounting section. In the figure, 1 is a printing head, 2 is a platen, 3 is a printing section, 7 is a mark sensor, 8 and 9 are guide plates, 1
0 is the paper path, 12 is the printing paper, 13 is the mark,
19 is a feeding roller device, 19a is a pressure receiving roller, 1
9b is a pressure roller, 19c is an extension of the pressure roller, 19d is an extension of the pressure receiving roller, and 26 is a sensor guide.

Claims (1)

[Claims for Utility Model Registration] A paper path including a feed roller device 19 that feeds printing paper by sandwiching it between a pressure roller 19a that is pivoted in a fixed position and a pressure roller 19b that is biased by the pressure roller 19a. 10, the end of the pressure roller 19b is connected to the pressure receiving roller 19.
This extending portion 19c extends in the roller axial direction from a, and the mark sensor 7, which is disposed opposite to the extending portion 19c on the axial extension of the pressure receiving roller 19a, constitutes a detecting portion. Pressure receiving roller 19
A mounting structure for a mark sensor in a printer device, characterized in that the mark sensor is provided slightly offset in the printing paper feeding direction from the contact line between the pressure roller 19a and the pressure roller 19b.