JPS62178371A - Printer - Google Patents

Abstract

PURPOSE:To set the clearance between a platen and a feed roller according to the thickness of the use paper to be set and at the same time, to give a suitable printing pressure, by a method wherein a use paper pinch means is so constructed as to be able to advance to and retreat from a platen in conjunction with the advance to or retreat from the platen of a printing means. CONSTITUTION:A use paper pinch means H is so constructed as to be able to advance to or retreat from a platen in conjunction with the advance to or retreat from a platen 30 of a printing means I using the pivoting of a lever 4. When detent holes 4a, 4b are fitted with projected parts by counterclockwise rotation of the lever 4, a pivot member 5 is rotated clockwise utilizing a pin 6 as its center by an eccentric cam 3 via connecting lever 7 following the counterclockwise rotation of the lever 4, and a feed roller 53 is separated from the platen 30. Further, as the lever 4 is rotated counterclockwise, a carrier 1 is rotated counterclockwise utilizing a guide axis as its center and the printing means I is retreated from the platen 30. Therefore, the setting of thick paper becomes possible. Furthermore, the printing pressure on this paper can be suitably set and besides, the generation of jam or the like can be also prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a printer in which a printing device and a paper holding device move forward and backward relative to a platen in conjunction with each other.

[Conventional technology]

Figures 3 and 4 show the main parts of the printing means and paper holding means in a conventional printer. show. In the figure, I is a printing means,
Daisy wheel 11 and motor 12 that rotationally drives it
A printing device 13 having a printing head 13a fixed on this motor 12 is constructed with a paper guide 14 and the like.

Reference numeral 20 denotes a carrier carrying a printing means I, which is installed along the platen 30 and is slidably attached to guide shafts 40a and 40b. Y is paper holding means, and shaft 5
a feed roller 53 coaxially fixed to the shaft 51.52; a roller arm 54 rotatably supporting the shaft 51.52;
The roller arm 54 is attached to one end so as to be rotatable around the center of the roller arm 55, and the other end is supported on a machine frame 60 supported on both side plates of the printer. The hook 56f provided on the machine frame 6
A spring 57 is tensioned between the spring 57 and the spring 57, which biases the arm 56 upward in the figure, and a spring 57 that is loosely fitted into an elongated hole (not shown in the drawings) formed on both side plates (the middle part is a constriction). A lever 59 that rotates a C-shaped stopper 595 and a spring 5 that is stretched between the lower side of the lever 59 and the side plate and biases it downward.
It is composed of 8 parts. 70 is paper punch, 7-
It is supported by the bin 55 and the machine frame 60 provided on the 456,
The pins 55 are engaged with the notches of the bent portions 70m formed at both ends of the paper pan 70.

A feed roller 53 protrudes from an elongated hole 61 formed in the bar handle 70.

In the conventional printer, since the paper holding means Y is configured as described above, when the lever 59 is rotated counterclockwise in FIG.
93, push down the arm 56 against the spring 57 to separate the feed roller 53 from the platen 300 surface as shown in FIG.

When the lever 59 is rotated clockwise from the state shown in FIG. 5, the arm 56 is pulled upward in the figure by the spring 57, so that the feed roller 53 is pressed against the surface of the platen 300.

[Problem that the invention seeks to solve]

In the conventional printer, the feed roller 53 is brought into pressure contact with the surface of the platen 300 or separated by operating the lever 59. On the other hand, the gap between the print head 13a of the printing means 1 and the platen 300 is configured to be a constant gap. Therefore, if you want to use thick paper, the resistance between the platen 30 and the print head 13a will be large (this will put a large load on the paper feed motor, or the printing pressure will become larger than the appropriate printing pressure). .Also, from the beginning, paper hand 70
When the gap 2 between the paper pan 70 and the platen 30 is made larger, there is a problem in that jams tend to occur between the paper pan 70 and the platen 30 when the paper is thin.

[Means for solving problems]

The purpose of this invention is to set the gap between the platen and the feed roller according to the thickness of the paper to be set, and at the same time apply appropriate printing pressure. and a paper holding means spring-biased to move forward and backward with respect to the platen, a daisy wheel, a motor for rotationally driving the same, a printing device, etc.; a movement control means that is movable in the axial direction of the platen and movable forward and backward with respect to the platen; and a movement control means that is installed between the movement control means and the paper holding means, and is interlocked with the movement of the printing means back and forth with respect to the platen. A link mechanism is provided that allows the paper holding means to move forward and backward relative to the platen.

〔Example〕

FIG. 1 shows an embodiment of the invention. In the figure, engineering, 11-14.30.51-56.56f.

57.60.70.70m indicates the same part as in Figure 3.

Reference numeral H denotes a paper holding means, which is composed of the above-mentioned 51 to 56f and 57, and is supported by a spring 57 so that it can move forward and backward with respect to the platen 30.
Eli is encouraged by this. Reference numeral C denotes movement control means, which includes a carrier 1 on which the printing means (3) is mounted, guide shafts 2a and 2b that guide the carrier 1 in the axial direction of the platen 30,
An eccentric cam 3 that is attached to the guide shaft 2b and moves the printing means I forward and backward with respect to the platen 30, and a locking hole 4a that locks with a protrusion (not shown) provided on or near the side plate, for example. , 4b. L is attached by a link mechanism, and its intermediate portion is attached to the intermediate portion of the arm 56. Also,
One end of the connecting rod 7 is attached to the other end of the rotating member 5, and the other end is attached to the guide shaft 2bTlc.

In the printer of this embodiment, the rotation of the lever 4 is modified so that the paper holding means H can move forward and backward with respect to the platen in conjunction with the forward and backward movement of the printing means (2) with respect to the platen 30, as shown in FIG. From this state, rotate the lever 4 counterclockwise to close the locking hole 4a.

4b is locked to the protrusion, as the lever 40 rotates counterclockwise, the rotating member 5 rotates clockwise around the eccentric cam 3 and the bottle 6 via the connecting rod 7. Then, the feed roller 53 separates from the platen 30. Further, as the lever 4 rotates counterclockwise, the carrier 1 rotates counterclockwise about the guide shaft 2a, and the printing means I retreats from the platen 30.

Therefore, thick paper can be set L4, and the printing pressure can be appropriately set for this paper.

On the other hand, when the lever 4 is rotated clockwise from the state shown in FIG. Due to the rotation, the feed roller 53 is pressed against the platen 30, while the carrier 1 rotates clockwise about the guide shaft 2a, and the printing means I advances toward the platen.

Therefore, it is possible to set thick paper to thin paper, and moreover, an appropriate printing pressure can be set for this paper, and occurrences of jams and the like can be solved.

The above explanation is not limited to digital printers, but is of course applicable to impact printers.Also, it describes the two-stage advance/retreat mechanism for rotating the lever 4. However, a multi-stage advance/retreat mechanism is also possible.

〔Effect of the invention〕

In this invention, the paper holding means is configured to move forward and backward relative to the platen in conjunction with the forward and backward movement of the printing means relative to the platen, so that the gap between the platen and the feed roller is set according to the thickness of the paper to be set. However, at the same time, there is an effect that appropriate printing pressure can be applied.

[Brief explanation of drawings]

FIG. 1 is a side view of the main part showing an embodiment of the present invention, FIG. 2 is a view showing the state after the printing means and paper holding means have been withdrawn from the platen, and FIG. 3 is a side view of the main part of the conventional example. Figure 4 is the third
FIG. 5 is an exploded perspective view taken from 51° to 57.70° 30 as shown in the figure, showing a state in which the sheet holding means is retracted from the platen. In the figure, 11--daisy wheel, 12--motor, 13--printing device, 53--feed roller, 54--roller arm 70, 55--bin, 56--
... Arm, 30... Platen, H... Paper holding means, ■... Printing means, C... Movement control means, L...
・It is an IJ link mechanism.

Claims (1)

[Scope of Claims] A printing means comprising a paper holding means having a feed roller and its support member and spring-biased so as to be able to advance and retreat with respect to the platen, and a printing device having a print head; means movable in the axial direction of the platen;
and a movement control means attached to be movable forward and backward with respect to the platen; and a movement control means installed between the movement control means and the paper holding means, and configured to move the paper holding means relative to the platen in conjunction with movement of the printing means back and forth relative to the platen. A printer characterized by comprising: a link mechanism that allows the printer to move forward and backward;