JPH0530036Y2 - - Google Patents

Description

[Detailed description of the invention] [Summary] This relates to a conveying mechanism for a printing device that prints on a recording medium, and more specifically, to an improvement in the conveying mechanism that delivers the recording medium set in the insertion port to the printing unit, with the aim of preventing the medium from being skewed when conveying it. a feed roller located on a guide path formed by the inclined portion; a stopper provided on the guide path formed by the inclined portion and between the feed roller and the printing unit; a sensor provided between the stopper and the feed roller for detecting the arrival of the recording medium; and a holding member provided opposite an upper surface of the inclined portion upstream of the feed roller, for pressing the recording medium against the inclined portion to hold the recording medium in a regular set position when the sensor detects the arrival of the recording medium;
The recording medium is configured to protrude toward the upper surface of the upstream portion of the inclined portion relative to the pressing position by the holding member, and to press the recording medium passing through the gap with the inclined portion toward the inclined portion, thereby preventing the recording medium from bulging.

[Industrial Application Field] The present invention relates to a conveyance mechanism of a printing device that prints on a recording medium, and more specifically, to an improvement of a conveyance mechanism that delivers a recording medium set in an insertion slot to a printing section.

The above-mentioned transport mechanism, when transporting the recording medium,
It is required that there be no skew of the recording medium.

[Prior Art] A configuration diagram of a conventional conveyance mechanism is shown in FIG. 3, and a perspective view of a printing device having the conveyance mechanism is shown in FIG. 4. In the figure, 1 is an insertion slot for a thin sheet of recording paper 2, which is a recording medium. A downwardly inclined guide 4 is provided from the insertion opening 1 to the printing section 3.
The guide 4 includes an upper guide 4a and a lower guide 4b.
The lower guide 4b further includes a horizontal portion 4c and an inclined portion 4d. Reference numeral 5 denotes a feed roller that delivers the recording paper 2 to the printing section 3, and is composed of a drive roller 5a provided on the upper guide 4a side and a pinch roller 5b provided on the lower guide 4b side. In response, the drive roller 5a moves toward the recording paper 2.
It is designed to hold the A stopper 6 is provided between the feed roller 5 and the printing section 3 so as to protrude from the lower guide 4b. A transmission type sensor 7 is provided between the stopper 6 and the feed roller 5, and includes a light emitting section 7a and a light receiving section 7b. Between the feed roller 5 and the insertion slot 1, a holding lever 8 is rotatably provided on the top guide 4a as a holding member for the recording paper 2. This holding lever 8 is
In response to a signal from the sensor 7, it rotates from the position indicated by the solid line to the position indicated by the two-dot chain line in FIG. The recording paper 2 is attached to the rotating end of the holding lever 8.
A rubber holding part 8 that holds the on the lower guide 4b side.
A is provided. Further, in FIG. 4, reference numeral 9 denotes a print head of, for example, a wire dot type, 10 a ribbon cartridge, and 11 a platen, which are provided within the print section 3.

Next, the operation of the above configuration will be explained.

First, when the recording paper 2 is manually inserted into the insertion slot 1, the leading end 2a of the recording paper 2 is guided by the guide 4, shielding the sensor 7 from light, and comes into contact with the lower part of the abutment surface of the stopper 6. . Then, in response to the signal from the sensor 7, the holding lever 8 rotates from the position shown by the solid line to the position shown by the two-dot chain line, and the holding part 8a presses the recording paper 2 and holds it on the lower guide 4b side, and the recording paper 2 is positioned at the normal set position. Next, the pinch roller 5b of the feed roller 5 is moved to the drive roller 5a.
side (indicated by the arrow in FIG. 3) and clamps the recording paper 2. At this time, the leading edge 2a of the recording paper 2
moves above the stopper 6. Then, the drive roller 5a rotates in the direction of the arrow and delivers the recording paper 2 to the printing section 3. The recording paper 2 is inserted between the printing head 9 of the next printing section 3 and the platen 11, and predetermined printing is performed.

[Problems to be Solved by the Invention] In the transport mechanism configured as described above, since the recording paper 2 is thin, the trailing end 2b of the recording paper 2 is bent in the direction of the horizontal portion 4c of the lower guide 4b, and the end portion 2b is bent in the direction of the horizontal portion 4c of the lower guide 4b, near the part pressed by the holding lever 8. A bulge A is formed therein. Therefore, when holding the recording paper 2 on the lower guide 4b side and positioning it to the normal setting position, the holding portion 8a of the holding lever 8 presses the bulge A of the recording paper 2, and the reaction causes the recording The leading edge 2a of the recording paper 2 is rigid by itself and may come off the abutting surface of the stopper 6, or the trailing edge 2b of the recording paper 2 may return to the insertion slot 1 side and cannot be held in the correct setting position. There are cases. If conveyance is carried out in this state, there is a problem in that the paper is skewed and printing cannot be done at a predetermined location.

The present invention has been made in view of the above-mentioned problems, and its purpose is to provide a conveyance mechanism that does not cause skew when conveying a medium.

[Means for solving problems] FIG. 1 is a diagram showing the principle of the conveyance mechanism of the present invention.

In the figure, 21 is an insertion slot for a recording medium 22 such as recording paper, 23 is a printing section, and 24 is an upper guide 24a and a lower guide 24b.
This is a guide that guides the image to the printing section 23.

The lower guide 24b has a horizontal portion 24c on the upstream side near the insertion port 21, and a downwardly inclined portion 24d on the downstream side of the horizontal portion 24c.
is sloped along.

25 is a feed roller located on the guide path formed by the slope portion 24d, 26 is a guide path formed by the slope portion 24d, and the feed roller 25 and the printing portion 23
A stopper 27 provided on the guide path between the stopper 26 and the feed roller 25 is a sensor for detecting the arrival of the recording medium 22.

28 is provided to face the upper surface of the upstream side of the feed roller 25 of the inclined portion 24d, and when the sensor 27 detects the arrival of the recording medium 22, the recording medium 22
This is a holding member that holds the recording medium 22 at a normal set position by pressing the recording medium 22 against the inclined portion 24d. In this figure, the holding member 28 is of a rotating lever type in which a pressing portion is provided at the rotating end.

29 protrudes toward the upper surface of the upstream portion of the inclined portion 24d from the pressed position by the holding member 28, and presses the recording medium 22 passing through the gap with the inclined portion 24d against the inclined portion 24d, causing a bulge in the recording medium 22. It is a means of restraint that prohibits

[Operation] The recording medium 22 inserted through the insertion opening 21 is pressed against the inclined portion 24d by the holding means 29, and is prevented from bulging.
Guided by a guide 24, the leading end of the recording medium 22 comes into contact with a stopper 26. Then, the recording medium 22
The holding member 28 presses the recording medium 22 against the inclined portion 24d in response to the output signal of the sensor 27 which detects this, and the recording medium 22 is held at the normal set position.

Next, the recording medium 22 is delivered to the printing section 23 by the feed roller 25.

[Example] FIG. 2 is a block diagram showing an example of the present invention. In this figure, numeral 31 is an insertion opening for a thin sheet-like recording paper 32 which is a recording medium. Insertion port 3
From 1 to the printing section 33, there is a guide 3 that slopes downward.
4 is provided. The guide 34 consists of an upper guide 34a and a lower guide 34b, and the lower guide 34b further includes a horizontal portion 34c and an inclined portion 3.
4d. Reference numeral 35 denotes a feed roller that delivers the recording paper 32 to the printing section 33, and is composed of a drive roller 35a provided on the upper guide 34a side and a pinch roller 35b provided on the lower guide 34b side. In response, it moves to the drive roller 35a side and clamps the recording paper 32. A stopper 3 is provided between the feed roller 35 and the printing section 33.
6 is provided protrudingly from the lower guide 34b. And between the stopper 36 and the feed roller 35,
A transmission type sensor 37 is provided which includes a light emitting section 37a and a light receiving section 37b. Between the feed roller 35 and the insertion slot 31, a holding lever 38 is rotatably provided on the top guide 34a as a holding member for the recording paper 32. This holding lever 38 is
In response to the signal of sensor 37, in FIG.
It rotates from the position indicated by the solid line to the position indicated by the two-dot chain line. A holding member 38a that presses the recording paper 32 toward the lower guide 34b is provided at the rotating end of the holding lever 38. A pinch roller 39 is provided on the upper guide 34a at an upstream portion of the inclined portion 34d of the lower guide 34b from the pressing position of the holding member 38a, as a pressing means that projects toward the upper surface of the inclined portion 34d.

Next, the operation of the above configuration will be explained.

When the recording paper 32 is manually inserted into the insertion slot 31, the recording paper 32 is guided while being pressed against the lower guide 34b by the pinch roller 39.
The tip 32a shields the sensor 37 from light, and then comes into contact with the lower part of the abutment surface of the stopper 36. Then, in response to the signal from the sensor 37, the holding lever 38 rotates from the position shown by the solid line to the position shown by the two-dot chain line, the holding lever 38 presses the recording paper 32, and the recording paper 32 is moved to the normal setting position. Positioning is done. Next, the pinch roller 35b of the feed roller 35 moves toward the drive roller 35a (indicated by an arrow in FIG. 2), and
The recording paper 32 is held between them. At this time, the leading end 32a of the recording paper 32 moves above the stopper 36. Then, the drive roller 35a rotates in the direction of the arrow and delivers the recording paper 32 to the printing section 3.

According to the above configuration, when the recording paper 32 is inserted,
Above the inclined portion 34d of the lower guide 34b, the pinch roller 39 prevents the recording paper 32 from moving in the bulging direction, and the recording paper 32 does not bulge near the portion pressed by the holding lever 38. Therefore, when the holding lever 38 presses the recording paper 32, the leading end 32a of the recording paper 32 may come off the abutment surface of the stopper 36, or the terminal end 32b
does not return to the insertion port 31 side, and is reliably positioned at the proper set position. Therefore, there is no possibility of skewing during conveyance.

Note that the present invention is not limited to the above embodiments. In the above embodiment, the pinch roller 39 is used as the pressing means, but a pressing member may be provided on the upper guide 34a, or the distance between the upper guide 34a and the lower guide 34b may be narrowed by the distance between the holding lever 38 and the insertion port 31. It's okay.

[Effects of the Invention] As explained above, according to the present invention, since the pressing means is provided between the holding member and the insertion port, no bulge is generated in the recording medium. Then,
It is possible to realize a conveyance mechanism that does not cause skew during medium conveyance.

[Brief explanation of drawings]

Figure 1 is a principle diagram of the conveyance mechanism of the present invention, Figure 2 is a configuration diagram showing an embodiment of the present invention, Figure 3 is a configuration diagram of a conventional conveyance mechanism, and Figure 4 is a diagram showing a conventional conveyance mechanism. FIG. 2 is a perspective view of a printing device. 1 and 2, 21 and 31 are insertion slots, 22 is a recording medium, 23 and 33 are printing parts, and 2
4, 34 are guides, 25, 35 are feed rollers, 2
6, 36 are stoppers, 27, 37 are sensors, 28
29 is a holding means, 32 is a recording paper, 3
8 is a holding lever, and 39 is a pinch roller.

Claims (1)

[Claims for Utility Model Registration] A guide that guides the recording medium 22 from the insertion slot 21 to the printing section 23, and is composed of an upper guide 24a and a lower guide 24b, and the lower guide 24b is located on the upstream side near the insertion slot 21. has a horizontal portion 24c and a downwardly sloped portion 24d downstream of the horizontal portion 24c, and the upper guide 24a includes a guide 24 that is sloped along the sloped portion 24d, and the sloped portion. a feed roller 25 located on a guide path formed by the inclined portion 24d; a stopper 26 provided on a guide path formed by the inclined portion 24d and between the feed roller 25 and the printing unit 23; a sensor 27 provided between the stopper 26 and the feed roller 25 to detect the arrival of the recording medium 22; and a sensor 27 provided opposite to the upper surface of a portion of the inclined portion 24d upstream from the feed roller 25; When the sensor 27 detects the arrival of the recording medium 22, it presses the recording medium 22 against the inclined portion 24d,
A holding member 28 that holds the recording medium 22 at a regular set position is provided, and the recording medium 22 held at the regular set position by the holding member 28 is moved to the feed roller 2.
5, in the conveying mechanism configured to deliver the image to the printing unit 23, the inclined portion 24d protrudes toward the upper surface of a portion upstream of the position pressed by the holding member 28;
A conveyance mechanism characterized in that a holding means 29 is provided to press the recording medium 22 passing through the gap with the inclined part 24d toward the inclined part 24d and to prevent the recording medium 22 from bulging.