JPH0585645U - Printer - Google Patents

Abstract

(57) [Summary] [Configuration] Platen 13 and shaft between the frames 11 on both sides.
Support 14. Mount the carrier 25 on the shaft 14 so that it can move freely. The recording head 31 is mounted on the carrier 25. The support 39 of the paper guide 36 is attached to the eccentric shaft 16 of the shaft 14.
The shaft 14 is rotated by the adjusting motor 21 to adjust the distance between the platen 13 and the recording head 31 and the paper guide 36. [Effect] The paper near the recording head 31 can be guided over the entire length in the width direction. Paper of various thickness dimensions can be smoothly transported.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a printer including a paper guide that guides paper near a recording head.

[0002]

[Prior Art]

 Conventionally, for example, a printer having a structure shown in FIG. 3 is known. In this printer, a platen 2 and a shaft 3 are supported between the frames 1 on both sides along the width direction of the paper, and a carrier 4 is attached to the shaft 3 so as to be movable in the width direction of the paper. A recording head 5 for recording on a sheet and a rectangular plate-shaped sheet guide 6 for guiding the sheet in the vicinity of the recording head are mounted on the carrier 4 so as to face the platen 2 with a gap 7 therebetween. Further, the paper guide 6 is formed with a rectangular through hole 6a through which the recording surface portion of the recording head 5 is inserted.

Further, for example, a printer having a structure shown in FIG. 4 is known. Also in this printer, the platen 2 and the shaft 3 are supported between the frames 1 on both sides along the width direction of the paper, and the carrier 4 is attached to the shaft 3 so as to be movable in the width direction of the paper. A recording head 5 for recording on paper is attached to the carrier 4 so as to face the platen 2. In this printer, a rectangular plate-shaped paper guide 8 for guiding the paper near the recording head is fixed between the frames 1 on both sides in a state of facing the platen 2 with a gap 9 therebetween. Further, the paper guide 8 is formed with an elongated rectangular through hole 8a through which the recording surface portion of the recording head 5 is inserted, over the entire length in the width direction of the paper.

[0004]

[Problems to be solved by the device]

 In the conventional printer having the structure shown in FIG. 3, since the paper guide 6 is attached to the carrier 4 that moves together with the recording head 5, the width dimension of the paper guide 6 is limited to a small shape, so that the paper The paper cannot be guided over the entire length in the width direction. Therefore, there is a problem in that the part of the paper that is not guided by the paper guide 6 is bent and may come into contact with the paper conveyance roller.

Further, in the conventional printer having the structure shown in FIG. 4, the paper guide 8 can guide the paper near the recording head 5 over the entire length in the width direction, but the paper guide 8 is provided between the frames 1 on both sides. Since it is fixed, the distance between the platen 2 and the paper guide 8 is always constant and cannot be changed, and there is a problem that the paper cannot be conveyed smoothly depending on the thickness of the paper.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a printer that can reliably guide sheets of various thicknesses in the vicinity of the recording head.

[0007]

[Means for Solving the Problems]

 The printer of the present invention is provided with a recording head for recording on a sheet, a platen provided over the entire length of the sheet in the width direction and facing the recording head with a gap therebetween, and provided along the width direction of the sheet. A support, a drive unit for driving the support, a carrier on which the recording head is mounted and which is supported by the support so as to be movable in the width direction of the sheet, and a sheet which faces the platen with a gap therebetween. And a paper guide which is provided over the entire length in the width direction and is supported by the end portion of the support.

[0008]

[Action]

 In the printer of the present invention, recording is performed on the sheet guided between the platen and the sheet guide by the recording head mounted on the carrier moving in the width direction. The carrier on which the recording head is mounted and the paper guide are supported by the support, and the support is driven by the driving means to move the recording head and the paper guide forward and backward with respect to the platen. The paper guide is supported on the end portion of the support body and is provided over the entire width of the paper without obstructing the movement of the carrier.

[0009]

【Example】

 The configuration of an embodiment of the printer of the present invention will be described below with reference to the drawings.

In FIG. 1 and FIG. 2, 11 is a side frame arranged on both sides, and these side frames 11 face each other substantially parallel to each other with a width dimension equal to or larger than a maximum width dimension of a recording sheet. It is provided in the opened state. Between these side frames 11, a platen 13 and a cylindrical shaft 14 as a support body are attached over the entire length of the sheet conveyed in the conveying path 12 in the width direction.

The shaft 14 includes an eccentric shaft 16 which is eccentrically provided from both ends of the main body 15 and which constitutes an automatic paper thickness determining means, and an eccentric shaft 16 which is concentric with the main body 15 from one end of the eccentric shaft 16. And a rotary shaft 17 protruding from the rotary shaft 17, and is connected to a rotary shaft 22 of an adjust motor 21 which constitutes an automatic paper thickness determining means via a gear 18 axially attached to the tip of the rotary shaft 17. It is driven to rotate. The adjust motor 21 is provided with a torque limiter mechanism that idles when a predetermined rotational torque is applied.

Further, 25 is a carrier, and a fitting hole 26 penetrating in the width direction of the paper is formed in the carrier 25, and the main body portion 15 of the shaft 14 is slidable in the fitting hole 26. After being fitted, they are mounted so as to be reciprocally movable in the width direction of the paper by being driven by a drive belt (not shown) that is wound around in parallel with the shaft 14.

The recording head 31 and the ribbon cassette 32 are mounted on the carrier 25. The recording head 31 has a dot element in which a plurality of dot pins are arranged side by side so as to form a dot matrix printer, and the recording surface portion 34 provided at the tip end faces the platen 13 with a slight gap. Is becoming

Reference numeral 36 is a plate-shaped paper guide, and the paper guide 36 has a guide portion 37 that is provided over the entire length in the width direction of the paper and faces the platen 13 with a slight gap. .. The guide portion 37 is formed with an elongated rectangular through hole 38 through which the recording surface portion 34 of the recording head 31 is inserted along the width direction of the sheet, and recording is performed on the sheet through the through hole 38. It is supposed to be done.

Further, both ends of the guide portion 37 are bent to form a support portion 39, and the vicinity of the tips of the support portions 39 are attached to the eccentric shafts 16 at both ends of the shaft 14.

As shown in FIG. 2, a plate-shaped lower paper guide 41, a plurality of transport rollers 42, and a main roller 43 are provided along the lower surface of the transport path 12, and the upper surface of the transport path 12 is provided. An upper paper guide 45 and a plurality of conveyance rollers 46 are provided along the above. Further, the main roller 43 has a plurality of annular recesses formed on the outer peripheral surface thereof, and the distal end of the guide body 13a extending from the platen 13 is inserted into the annular recess.

Further, above the recording head 31 and the platen 13 of the transport path 12, there are provided a bail roller 47 and a transport roller 48 that rotate in close contact with each other via the transport path 12.

Next, the operation of this printer will be described.

First, by inserting a sheet into the transport path 12 and turning on the sheet feed switch, the motor is driven based on a command signal from a drive control unit controlled by a CPU (not shown), and the rotation shaft and transmission of the motor are transmitted. The transport rollers 42 and 46 are rotated through the mechanism to transport the paper. In this state, the automatic paper thickness determination means is operated. That is, first, the adjust motor 21 is rotated in the forward direction to rotate the recording head 31 and the paper guide 36 via the eccentric shaft 16 to separate the recording head 31 and the paper guide 36 from the platen 13. In this state, the conveyance rollers 42 and 46 are rotated to convey the paper to the gap between the platen 13 and the recording head 31 and the paper guide 36. Then, the adjusting motor 21 is rotated in the opposite direction to rotate the recording head 31 and the paper guide 36, bring the recording head 31 and the paper guide 36 close to the platen 13, and bring the paper guide 36 into contact with the paper. Let In this state, the torque limiter mechanism of the adjust motor 21 operates and the recording head 31 and the paper guide 36 stop at a position where they press the paper with a predetermined pressure. In this state, by rotating the adjusting motor 21 in the forward direction by a predetermined angle, the recording head 31 and the paper guide 36 are arranged at appropriate positions for paper of various thickness dimensions. ..

In this state, the conveyance rollers 42 and 46 are rotated based on command signals from the drive control unit and the print control unit to convey the paper, and the carrier 25 is reciprocally moved to drive each dot element. Recording is performed on the paper by the recording head 31.

According to the printer of this embodiment, since the platen 13 and the paper guide 36 are provided over the entire length in the width direction of the paper, it is possible to guide the paper near the recording head 31 over the entire length in the width direction. You can Therefore, it is possible to reliably guide the paper, prevent the paper from contacting the bale roller 47 and the like, and prevent the paper from jamming, so that the paper can be conveyed smoothly.

Further, since the paper guide 36 is supported by attaching the support portions 39 provided at both ends to the eccentric shafts 16 at both ends of the shaft 14, the paper guide 36 can be moved in the width direction of the paper without hindering the movement of the carrier 25. It is provided over the entire length and can guide the paper.

Further, the thickness of the paper is determined by the automatic paper thickness determination means, and the shaft 14 is rotated in accordance with the thickness of the paper, whereby the carrier 25 having the recording head 31 and Since the paper guide 36 moves back and forth with respect to the platen 13, the distance between the recording head 31 and the platen 13 and the distance between the paper guide 36 and the platen 13 are adjusted to separate the paper from the recording head 31. The size can be maintained properly for good recording, and paper can be prevented from being pinched in the gap between the platen 13 and the paper guide 36, and paper jams can be prevented. Can be transported smoothly.

Although the recording head 31 of the printer in the above-described embodiment has been described as an impact printer using dot pins, it is not limited to an impact printer, and a thermal printer using a thermal head or another printer may be used in the present invention. Can be applied similarly.

[0025]

[Effect of the device]

 According to the printer of the present invention, since the platen and the paper guide are provided over the entire length in the width direction of the paper, it is possible to guide the paper in the vicinity of the recording head over the entire length in the width direction, so that the guide of the paper can be securely provided. Can be By driving the support by the driving means, the carrier carrying the head and the paper guide move forward and backward with respect to the platen, so that the distance between the head and the platen and the distance between the paper guide and the platen are increased. The spacing dimension is adjusted, and good recording can be performed on sheets of various thickness dimensions. Since the paper guide is supported on the end of the support, the carrier can be guided over the entire width of the paper without hindering the movement of the carrier.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a printer of the present invention.

FIG. 2 is a side view of the same printer.

FIG. 3 is a plan view showing a conventional printer.

FIG. 4 is a plan view showing a conventional printer.

[Explanation of symbols]

 13 Platen 14 Shaft as support 21 Adjusting motor as drive means 25 Carrier 31 Recording head 36 Paper guide

Claims (1)

[Scope of utility model registration request] 1. A recording head for recording on a sheet, a platen which is provided over the entire length of the sheet in the width direction and faces the recording head with a gap, and a support provided along the width direction of the sheet. Drive means for driving the support, a carrier on which the recording head is mounted and supported by the support so as to be movable in the width direction of the paper, and a width of the paper facing the platen with a gap. A paper guide which is provided over the entire length in the direction and is supported by the end of the support.