JPH0755082Y2 - Printer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Outline] A support shaft that rotatably holds a pressing roller that presses a sheet against a platen surface, and that supports a set guide that introduces the leading edge of the sheet between the platen and the pressing roller. Is provided parallel to the longitudinal direction of the platen surface,
The position of the support shaft is set to a position separated from the platen surface by a distance where the leading end of the fed paper does not come into contact with it, so that the leading end of the paper is not caught on the supporting shaft.

[Industrial application field]

The present invention relates to a printer such as a serial printer such as a wire dot printer having an improved support structure for a pressing roller that presses a sheet against a platen.

Recently, various wire dot printers have been put into practical use as printers for terminals of various computers and word processors. When setting printing paper in these printers, it is necessary to obtain a reliable set state.

[Conventional technology]

Only the main part of the conventional printer is shown in the side view of FIG. 3 and the plan view of FIG. According to the conventional printer thus illustrated, the print head 1 is mounted on the carrier 2 and faces the sheet 4 set along the surface of the platen 3 via the ink ribbon 5a. The ink ribbon 5a is supplied from the ink ribbon cassette 5 mounted on the carrier 2.

The carrier 2 is slidably engaged with a guide shaft 6 arranged along the longitudinal direction with respect to the surface of the platen 3 and screwed with a feed screw 7 also arranged parallel to the platen 3. There is. The feed screw 7 is connected to a motor via a belt (not shown) or the like, and the print head 1 is driven by an arrow A, by controlled rotation of the motor in the forward and reverse directions.
It can move back and forth in the B direction. The sheet 4 is conveyed and supplied in the direction of arrow C by a conveying device 8 which is a pin belt tractor.

A shaft 10 biased in the platen 3 direction by spring means (not shown)
The press rollers 9a and 9b for pressing the paper 4 against the surface of the platen 3 are rotatably held by the press roller.
Since 9a and 9b are slidable in the longitudinal direction of the shaft 10, the positions of the pressing rollers 9a and 9b can be set to the optimum positions according to the width of the sheet 4.

Each of the pressure rollers 9a and 9b has a sheet 4 that is conveyed and supplied.
A set guide, which is a guide for introducing and setting the tip between the platen 3 and the pressing rollers 9a and 9b.
14a and 14b are provided on the shaft 10, and a surface facing the platen 3 with an appropriate gap is formed. The shaft 10 has a D-shape with a circular cross-section partly having a flat surface, and the fitting holes of the set guides 14a and 14b have the same shape. Therefore,
The set guide is in a non-rotating state with respect to the shaft 10 and is slidably movable in the longitudinal direction of the shaft 10. However, since the pressing rollers 9a and 9b have a circular center hole, they can be freely rotated with respect to the shaft 10, and the set guide 14 is provided in the longitudinal direction of the shaft 10.
It is also free to move with the movement of a and 14b.

As well shown in FIG. 3, the carrier 2 is provided with a set plate 13 on the front side which is the side facing the platen 3. The upper side of the set plate 13 is formed with a curved portion 13a which is provided with an appropriate gap with the surface of the platen 3 and follows the curved surface thereof. As shown in FIG. 4, the width of the curved portion 13a in the left-right direction is set so that the print range of the print head 1 can be sufficiently secured, but the width is larger than the width of the carrier 2. Widely set as much as possible.

As shown in FIG. 3, the paper guide 11 is provided from the right side of the platen 3, which is behind the platen, to the lower side, and the pinch roller 12 is provided from the hole 11 a of the paper guide 11 to the platen 3.
It is open / closed to the surface.

With the above configuration, in order to set the sheet 4 in the set state, the carrier 2 is positioned substantially in the center of the platen 3, so that the set guides 14a and 14b are set at appropriate positions on both outer sides of the set plate 13 according to the sheet width. To place.

When the paper 4 is a continuous form, the pinch roller 12 is opened with respect to the platen 3 and the paper 4 is set on the conveying device 8 which is a pin belt tractor to be conveyed and supplied.
In the case of a single-cut form, the pinch roller 12 is closed with respect to the platen 3, and the paper 4 is set in a sandwiched state during this period to be fed and fed, and the paper 4 is fed to each of the print heads 1.
Transport in the direction of.

The sheet 4 conveyed as described above advances along the curved shape of the tip of the sheet guide 11 from the lower portion of the set plate 13 to follow the platen 3, and is guided by the curved portion 13a at the upper end to the platen 3 surface. Be accompanied by.

At the same time that the leading edge of the sheet 4 comes off the curved portion 13a, the sheet 4 is guided by being brought into contact with the lower ends of the set guides 14a, 14b, and is directly inserted and sandwiched between the platen 3 and the pressing rollers 9a, 9b.

Paper 4 set on platen 3 as described above
Further, by controlling the printing drive to the print head 1, the print magnet of the print head is selectively excited to collide the leading end surface of the print wire with the paper 4 surface via the ink ribbon 5a, thereby performing dot printing. Be done. The print head 1 sequentially prints as the carrier 2 moves in the A direction.
When the printing of the line is completed, the platen 3 is rotated and the paper 4 is fed.
Is fed and line feed is carried out in the backward direction of the print head 1, and printing is continued.

[Problems to be solved by the invention]

As described above, the sheet 4 is set and the printing is performed on the sheet 4. However, when the sheet 4 is set, the quality of the sheet 4 is hard, or the set guide is arranged at an appropriate position.
When the width of the paper 4 is significantly wider than the positions of 14a and 14b, as shown by the three-dot chain line in FIG.
The side edge portion side of the sheet 4 ′ that has deviated from the positions of 14 a and 14 b advances in the tangential direction without following the platen 3 surface,
The tips are set guides 14a, 14b and pressure rollers 9a, 9b.
There is a problem that the shaft 10 which is fitted and held cannot be automatically set because it is bent or bent.

[Means for Solving the Problems]

An object of the present invention is to provide a printer that solves the above-mentioned conventional problems, and the gist of the configuration of the printer of the present invention is the platen and its longitudinal direction relative to the platen surface. A carrier that can reciprocate in parallel with the direction along the line, a print head that is mounted on the carrier and that prints on a sheet that runs along the platen surface, and a sheet that is provided on the carrier and that is supplied to the platen that is on the platen surface. A set plate which guides the platen surface together, a pressing roller which presses a sheet of paper attached to the platen surface against the platen surface, a spindle provided parallel to the platen surface in the longitudinal direction thereof, and the spindle. Is supported by the pressure roller and rotatably holds the pressure roller, and the leading edge of the sheet guided by the set plate contacts the platen and the pressure roller. A set guide for introducing the set guide, and the position of the support shaft supporting the set guide is set to a position separated from the platen surface by a distance that the leading end of the sheet to be supplied does not come into contact. To do.

[Action]

According to the above-mentioned gist of the present invention, since the position of the support shaft supporting the set guide is set to a position at which the leading end of the sheet to be fed does not come into contact with the support plate and is separated from the platen surface, the support shaft is separated from the set guide. Moreover, the leading edge of the sheet, which advances in the tangential direction without following the platen surfaces in both end directions, does not come into contact with the support shaft because the space between the platen surface and the support shaft is sufficiently separated. Therefore, the leading edge of the sheet is passed under the support shaft without being caught, and the sheet is automatically set without any trouble.

〔Example〕

Hereinafter, the printer of the present invention will be described in detail with reference to the drawings based on the embodiments and the outline of the configuration.
The same parts are designated by the same reference numerals throughout the drawings.

The printer of the present invention is shown in the side view of FIG. 1 and the plan view of FIG. In the figure, a print head 1 is mounted on a carrier 2 and faces a sheet 4 set along the surface of a platen 3 via an ink ribbon 5a. The ink ribbon 5a is supplied from the ink ribbon cassette 5 mounted on the carrier 2.

The carrier 2 is slidably engaged with a guide shaft 6 arranged along the longitudinal direction with respect to the surface of the platen 3 and screwed with a feed screw 7 also arranged parallel to the platen 3. There is. The feed screw 7 is connected to a motor via a belt (not shown) or the like, and the print head 1 can reciprocate in the left-right direction in FIG. 2 by controlled rotation of the motor in the forward and reverse directions. The sheet 4 is conveyed and supplied in the direction of arrow C by a conveying device 8 which is a pin belt tractor.

A support shaft that is biased in the platen 3 direction by spring means (not shown) and is provided parallel to the platen 3 surface in the longitudinal direction thereof.
The set guides 15a and 15b are supported in a non-rotatable state in the longitudinal direction by slidable movement to arbitrary positions. Support shaft 16
Is, for example, a D-shape having a circular cross-section with a part of a flat surface, and the fitting holes 5 of the set guides 15a and 15b are also formed in the same shape to obtain a non-rotating state.

The set guides 15a and 15b have independent rotating shafts 17
Is provided, and the pressing rollers 9a and 9b are rotatably held on the rotating shaft 17. Therefore, this pressing roller 9
The positions of a and 9b can be set to optimum positions on the surface of the platen 3 according to the width of the sheet 4 by moving the set guides 15a and 15b on the support shaft 16.

The position of the support shaft 16 supporting the set guides 15a, 15b is set apart from the pressing rollers 9a, 9b so as not to contact the pressing rollers 9a, 9b, and set apart from the platen 3 surface by a predetermined distance as described later. ing.

A lower surface of the set guides 15a and 15b is formed with a surface facing the platen 3 surface with a proper gap, and guides the leading end of the conveyed sheet 4 between the platen 3 surface and the pressing rollers 9a and 9b. Can be made.

As well shown in FIG. 1, the carrier 2 is provided with a set plate 13 on the front side which is the side facing the platen 3. The upper side of the set plate 13 is formed with a curved portion 13a which is provided with an appropriate gap with the surface of the platen 3 and follows the curved surface thereof. As shown in FIG. 2, the width of the curved portion 13a in the left-right direction is set so that the print range of the print head 1 can be sufficiently secured, but the width is larger than the width of the carrier 2. Widely set as much as possible.

As shown in FIG. 1, a sheet guide 11 is provided from the right side of the platen 3, which is behind the platen, to the lower side, and the pinch roller 12 is provided from the hole 11a of the sheet guide 11 to the platen 3
It is open / closed to the surface.

With the above configuration, the carrier 2 is positioned substantially in the center of the platen 3 so that the sheet 4 can be set. Therefore, the set guides 15a and 15b are placed at appropriate positions on both outer sides of the set plate 13 according to the sheet width. To set.

When the sheet 4 is a continuous form, the pinch roller 12 is opened with respect to the platen 3 and the sheet is set on the conveying device 8 which is a pin belt tractor so that the sheet is conveyed and supplied. In the case of a single sheet, the pinch roller 12 is used. The platen 3 is closed, and the sheet 4 is set in a sandwiched state during this period and fed and fed, and the sheet 4 is fed in the direction of the print head 1.

The sheet 4 conveyed as described above advances along the curved shape of the tip of the sheet guide 11 from the lower portion of the set plate 13 to follow the platen 3, and is guided by the curved portion 13a at the upper end to the platen 3 surface. Be accompanied by.

At the same time that the leading edge of the sheet 4 comes off the curved portion 13a, the sheet 4 is guided by being brought into contact with the lower ends of the set guides 15a, 15b, and is directly inserted and sandwiched between the contact between the platen 3 and the pressing rollers 9a, 9b.

If the quality of the paper 4 set as above is hard,
If the width of the paper is significantly wider than the position of the set guides 15a, 15b which are arranged at appropriate positions, as shown by the chain double-dashed line in Fig. 1, disengage from the position of the set guides 15a, 15b. The side edge of the sheet 4 does not follow the surface of the platen 3 and is moved in the tangential direction as indicated by the two-dot chain line 4 '. However, according to the configuration of the present invention, as described above, the set guide 15a, The position of the support shaft 16 supporting the 15b is set to a position separated from the surface of the distance platen 3 which does not come into contact with the leading end of the sheet 4'which is thus separated.

This means that it is possible to set the distance from the state of the sheet 4 by assuming the sheet 4 expected to be used. That is, according to the present invention, the positional relationship between the support shaft 16 and the platen 3 surface is set in this way.

Therefore, even if the front end of the sheet 4 to be set may be separated from the platen 3 surface due to the hardness of the sheet 4 or the width of the sheet 4 being wider than the positions of the set guides 15a and 15b, the spindle 16 Since the position is passed through the lower part of the support shaft 16 without coming into contact with the leading end of the paper 4, it does not hit the support shaft 16 and the paper 4 is not bent and the conveyance failure does not occur.

[Effect of device]

As described in detail above, according to the printer of the present invention, the position of the support shaft supporting the set guide is set to a distance at which the leading end of the paper to be supplied does not come into contact with the printer, and a position separated from the platen surface. Therefore, the automatic setting of the paper can be surely performed without causing any trouble, and the practical effect is extremely remarkable.

[Brief description of drawings]

1 is a side view of a printer of the present invention, FIG. 2 is a plan view of a printer of the present invention, FIG. 3 is a side view of a conventional printer, and FIG. 4 is a plan view of a conventional printer. In each drawing, 1 is a print head, 2 is a carrier, 3 is a platen, 4 is paper, 5 is an ink ribbon cassette, 5a is an ink ribbon, and 6
Is a guide shaft, 7 is a feed screw, 8 is a conveying device, and 9a and 9a.
b is a pressing roller, 10 is a shaft, 11 is a paper guide, 12 is a pinch roller, 13 is a set plate, 13a is a curved portion, and 14a, 14b, 1
5a and 15b are set guides, 16 is a support shaft, and 17 is a rotation shaft.

Front page continuation (72) Inventor Satoshi Endo 1015 Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Within Fujitsu Limited (56) References JP-A-60-56579 (JP, A) JP-A-57-113089 (JP, A) Actual development Sho 61-105160 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A platen (3), a carrier (2) capable of reciprocating parallel to the platen surface in a direction along the longitudinal direction thereof, and a sheet mounted on the carrier and attached to the platen surface. A print head (1) for printing on (4),
A set plate (13) provided in the carrier (2) for guiding the paper supplied to the platen so as to be fitted to the platen surface, and a pressing roller (9a for pressing the paper fitted to the platen surface to the platen surface. ) (9b),
A support shaft (16) provided in parallel to the longitudinal direction of the platen surface and a support plate supported by the support shaft to rotatably hold the pressing roller and the set plate (1).
Set guide (15) for introducing the leading edge of the paper guided by 3) between the contact between the platen and the pressure roller.
a) (15b) and a position where the position of the support shaft (16) supporting the set guide is separated from the platen (3) surface where the leading end of the paper (4) to be fed does not come into contact. The printer characterized in that