JP5297074B2 - Roll paper printer - Google Patents

Description

  The present invention has a structure in which a back tension can be applied between a supply paper piece portion drawn from a thermal recording type roll paper and positioned between a thermal head and a platen roller, and an intermediate paper piece portion located behind the supply paper piece portion. Is a technology relating to a roll paper printer provided with

  Some measuring devices such as waveform recorders are equipped with a printer that prints necessary information such as waveforms on recording paper. As recording paper used in this case, thermal recording type roll paper is used, In many cases, a printer provided with a thermal head is used.

  In this case, it is necessary to apply a back tension to the supply paper piece portion pulled out from the roll paper in order to prevent curling of the halfway paper piece portion positioned in the middle of feeding between the thermal head and the platen roller.

For example, as disclosed in Patent Document 1 and Patent Document 2 below, such a back tension is provided with a torque limiter so that it can always be applied with a constant force.
JP-A-6-219002 JP 2004-291395 A

  However, conventional printers including the above-mentioned Patent Documents 1 and 2 equipped with a thermal head can apply a desired back tension, but are exposed when the roll paper is replaced using the back tension applying means. Since there is no structure capable of preventing the fingers from touching the print surface of the thermal head, there is a disadvantage that dirt is attached to the print surface.

  SUMMARY OF THE INVENTION The present invention provides a roll paper printer that can cover the print surface of a thermal head without exposing it even when the roll paper is replaced in view of the above-mentioned problems found in the prior art. With the goal.

The present invention has been made to achieve the above object, a printer body with various members necessary for printing comprising a thermal head provided with a platen roller, and, to the loaded roll paper for heat-sensitive recording wherein in the freely printing by the thermal head is composed of a roll paper cover mounted for opening pull on the printed body, at a lower position in the longitudinal direction of the thermal head in the printer body, the external pressure When the roll paper cover that does not act is opened, the thermal head is energized so as to cover the printing surface of the thermal head, and when the external pressure from the roll paper cover side is actuated, the roll paper cover is pulled out from the roll paper when closed. Oscillation that allows back tension to be applied to the intermediate paper piece located behind the supply paper piece reaching the platen roller. The most important feature that is disposed Ido means.

  According to the present invention, the swing guide means can cover and protect the print surface of the thermal head when the roll paper cover is opened, so that the operator can avoid touching the print surface with fingers and remove the dirt. Adhesion can be prevented.

  Further, the swing guide means can be smoothly fed to the thermal head side while preventing the curling or meandering by applying a back tension to the roll paper side when the roll paper cover is completely closed.

FIG. 1 is an overall perspective view showing an example of the present invention in a state where the roll paper cover is opened from the printer main body side. 2 is a side view of the example shown in FIG. 1 as viewed from the left side, which is the opposite direction . FIG. 2A is a view when the printer main body side is completely closed with a roll paper cover. The state (b) shows a state in which the roll paper cover is completely opened.

According to these drawings, the entire roll paper printer 11 is opened when the printer main body 12 including the thermal head 16 and the swing guide means 23 and the platen roller 38 and the roll paper 42 are replaced. it is composed of a roll paper cover 32 which is mounted swingably against the printer body 12 side to allow.

  Among these, the printer main body 12 includes a pair of left and right side plate portions 13 and 14 that can be incorporated in a measuring device such as a waveform recorder (not shown), and a top plate portion 15 that is spanned between the side plate portions 13 and 14. Are formed with a substantially gate-like shape.

The thermal head 16 is arranged along the length direction (left and right direction in the example shown in FIG. 1 ) on the lower surface side of the top plate portion 15 and with the print surface 16a facing downward.

Further, the swing guide means 23 provided in the printer main body 12 at a position below the thermal head 16 in the length direction is supported by a shaft support hole 25 provided on the base end portion 26 side. A pair of guide pieces 24, 24 that are swingably disposed at the left and right positions of the printer main body 12 via the shaft 17, and are laid across the guide pieces 24, 24 so as to be close to the print surface 16 a. And a driven guide portion 29 capable of facing each other.

Among these, the pair of guide pieces 24 and 24 abuts against the printer main body 12 side as shown in FIG. 5 when the driven guide portion 29 of the thermal head 16 faces the printing surface 16a as shown in FIG. A protruding piece 26 a that can stop the movement is provided on the open end side of the base end portion 26. The overall of the swing guide unit 23 during the lid opening, by depressing at hand for example a driven guide portion 29, be cleaned away from the state as well as printing surface 16 a shown in FIG. 6 (c) You can also.

  Each guide piece 24 extends from the base end portion 26 in the opposite direction, and has a long side portion 27 whose tip edge 27a is curved in the vertical direction, and an outer surface of the long side portion 27. In addition to a position restricting piece 28 that protrudes outwardly in a bowl shape, the long side 27 side is always urged by the torsion spring 18 interposed between the support shafts 17 to rotate upward. It is supported.

  On the other hand, the roll paper cover 32 is disposed on the left and right sides of the concave cover main body portion 33 in which the roll paper 42 is accommodated, and is swingable to the side plate portions 13 and 14 side of the printer main body 12. And a pair of support arm portions 34 and 35 connected to each other.

Then, the platen roller 3 8, when set to allow printing completely closed by pushing back the roll paper cover 32 into the printer body 12 side, the printing of the print head 16 as shown in FIG. 2 (a) It arrange | positions so that it may be located in the surface side.

  Moreover, the pair of support arms 34 and 35 ride on the position restricting piece 28 provided in each guide piece 24 as shown in FIG. 6 when the lid is closed and resist the urging force of the torsion spring 18 to the long side 27 side. A projection 36 is provided to push down.

Next, the movement of the swing guide means 23 when the roll paper cover 32 is opened and closed will be described with reference to FIGS. When the roll paper cover 32 shown in FIGS. 1 and 2B is fully opened, each guide piece 24 constituting the swing guide means 23 is also subjected to an external force from the roll paper cover 32 side via the protrusion 36. since not subject to, the platen roller 3 under a positional relationship that covers the 8 on the printed surface 16a in the driven guide unit 29, and FIG. 2 (b) and the printer body 12 side and the projecting piece 26a as shown in FIG. 4 The movement can be stopped so that it does not come into contact with the printing surface 16a side.

  When the operation of closing the roll paper cover 32 is started and the protrusion 36 provided on the roll paper cover 32 starts to ride on the start end 28a of the position regulating piece 28 provided on each guide piece 24 as shown in FIG. As shown in FIG. 6B, the entire swing guide means 23 starts to rotate so as to be gradually pushed down against the urging force of the torsion spring 18.

When the roll paper cover 32 is in a completely closed state, the protrusion 36 reaches the back end 28b of the position regulating piece 28 provided in each guide piece 24, and the entire swing guide means 23 is shown in FIG. the rotation is stopped at the position, the state shown in FIG. 2 (a).

Therefore, the swing guide means 23 is pulled out from the roll paper 42 as shown in FIG. 2A and reaches the supply paper piece 43 that reaches between the printing surface 16 a of the thermal head 16 and the platen roller 38. It is possible to apply a back tension by pressing the leading edge 27a side of the paper piece portion 44 located behind the paper.

In other words, the oscillating guide means 23, it is possible to cover and protect the printed surface 16 a of the thermal head 16 when the lid opening of the roll paper cover 32 in its driven guide unit 29, the printing surface 16 a worker with a finger It is possible to prevent adhesion of dirt without touching the surface.

  Further, the swing guide means 23 presses the leading edge 27a side of the driven guide portion 29 when the roll paper cover 32 is completely closed, and prevents the paper piece portion 44 side from being curled or meandered while applying a back tension. The paper can be smoothly fed out as the supply paper piece 43 to the thermal head 16 side.

1 is an overall perspective view illustrating an example of the present invention in a state where a roll paper cover is opened from a printer body side. FIG. 2 is a side view of the example shown in FIG. 1 as viewed from the left side, which is the opposite direction, in which (a) shows a state when the printer main body side is completely closed with a roll paper cover; Indicates a state in which the roll paper cover is completely opened. The principal part expansion perspective view which shows the positional relationship of a thermal head and a rocking | fluctuation guide means at the time of a perfect closure. The principal part expansion perspective view which shows the state at the time of pushing down the rocking | fluctuation guide means with a finger at the time of complete lid closure. It is principal part explanatory drawing which shows the positional relationship of the thermal head and rocking | fluctuation guide means at the time of a full opening, (a) of which shows a principal part expansion perspective view, (b) shows a principal part expansion side view, respectively. . It is explanatory drawing which shows a motion of the rocking | swiveling guide means at the time of opening and closing of a roll paper cover, of which (a) shows the state at the time of starting the movement to a closing direction, (b) is further to a closing direction. (C) shows the state when the movement is advanced, and FIG.

DESCRIPTION OF SYMBOLS 11 Roll paper printer 12 Printer main body 13,14 Side plate part 15 Top plate part 16 Thermal head 16a Printing surface 17 Support shaft 18 Torsion spring 23 Swing guide means 24 Guide piece 25 Shaft support hole 26 Base end part 26a Projection piece 27 Long Side 27a Leading edge 28 Position restricting piece 28a Start end 28b Deep end 29 Driven guide part 32 Roll paper cover 33 Concave cover main body part 34, 35 Supporting arm part 34a Tip part 36 Protruding part 38 Platen roller 42 Roll paper 43 Supply paper piece part 44 A piece of paper on the way

Claims (1)

A printer body including various members necessary for printing including a thermal head;
Comprising a platen roller, and is composed of said roll paper cover which is in the freely printing by the thermal head mounted for opening pull on the printed body to the loaded roll paper for heat-sensitive recording,
A lower position in the longitudinal direction of the thermal head in the printer body is biased so as to cover the printing surface of the thermal head during the lid opening of the roll paper cover external pressure is not applied, the roll paper cover side A back tension can be freely applied to the halfway paper piece located behind the supply paper piece that is pulled out of the roll paper and reaches between the thermal head and the platen roller when the lid is actuated by external pressure from A roll paper printer characterized by comprising a swing guide means.

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