JPH0336669B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention is applied to serial printing devices such as day printers that move a carriage along a platen guided by a guide shaft and sequentially print on sheets of paper set on the platen. be able to. Specifically, the present invention relates to a carriage head-up holding mechanism for raising the carriage head and maintaining the head-up state in such a serial printing device, for example, when replacing the type wheel.

BACKGROUND ART For example, in a digital serial printer, as shown in FIG.
are printed sequentially. Therefore, this carriage 1
includes a type wheel 4, a selection motor 6 that rotates the type wheel to select a desired type 5, and a type hammer 7 that strikes the selected type 5.
It was equipped with etc. When replacing the type wheel 4 with a different type, such as a different font or character, or when replacing the type wheel with a new type wheel due to damage, move the carriage 1 as shown by the two-dot chain line in the figure. Raise the head and separate the type wheel 4 from the platen 2 so that it can be replaced.
By the way, at this time, conventionally, a latch shaft 8 is provided on the carriage 1, and a set plate 1 having a holding portion 9 on the support frame side of the printer main body (not shown) is installed.
0 is attached and when the carriage 1 is raised, the raised state is maintained by engaging the latch shaft 8 in the holding part 9, which has a bifurcated tip.

Problems to be Solved by the Invention However, in the conventional carriage neck raising holding mechanism described above, the latch shaft 8 of the carriage 1 is held by the integrally molded set plate 10 fixed to the main body of the device. If there is variation in the mounting position of 8, the latch shaft 8 and the holding part 9
Therefore, the position of the set plate 10 must be adjusted one by one according to the position on the latch shaft 8 for each printing device.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide the above-mentioned printing device with the ability to easily hold the carriage in an upright position without being affected by variations in the mounting position of the carriage's latch shaft. .

Means for Solving the Problems To this end, the present invention provides a printing apparatus for rotating a carriage 20 and engaging a latch shaft 29 provided on the carriage with a set plate 30 to maintain the rotational state. The neck-up holding mechanism is characterized in that the set plate 30 is rotatably mounted within a certain angular range.

Function: Therefore, when the carriage 20 is rotated and raised, the latch shaft 29 can be engaged with the holding portion 35 of the set plate 30 at the appropriate angular position. In this case, for example, the latching shaft 29
Even if there is some variation in the mounting position of the latching shaft 29, when the latching shaft 29 hits the set plate 30, the set plate is rotated to correct its rotational position, and the center of the latching shaft and the holding part 35 can be adjusted. can be matched accurately.

Embodiments Hereinafter, the present invention will be described in detail and specifically based on embodiments of the invention shown in the drawings.

1 to 3 show a carriage head holding mechanism for a digital serial printer, which is an embodiment of the present invention. Reference numeral 20 in FIG. 1 is a carriage. The carriage is guided by a guide shaft 22 parallel to the platen 21.
It is possible to move along the platen 21, and to sequentially print on the paper 27 set on the platen 21 while moving. The carriage 20 includes a type wheel 23 and a selection motor 2 that rotates the type wheel to select a desired type 24.
5. A printing hammer 26 or the like is mounted to strike the selected type 24 and strike it against the platen 21 via the ribbon 28. When replacing the type wheel 23 with a different type, the type wheel 23 is rotated about the guide shaft 22 as shown by the two-dot chain line in the figure, and the carriage 20 is raised to a raised position. Therefore, a latch shaft 29 is provided on one side of the carriage 20 so as to protrude in a direction parallel to the guide shaft 22. And the carriage 2
0 is placed in a raised position, its latch shaft 29 engages with the set plate 30. The set plate 30 is attached to a support frame (not shown) of the printer main body.

The set plate 30 is attached rotatably around the pin by inserting a pin 32 into one piece 31a of the L-shaped fixing plate 31. The fixing plate 31 is attached to the support frame by inserting screws into the holes 31c of the other piece 31b, for example. And the set plate 30 is
As shown in FIG. 2, a long hole 3 is provided with a protrusion 33 at its lower end, and the protrusion is formed in an arc shape in the fixing plate 31.
4. Therefore, set plate 3
0 can be rotated within a rotation angle regulated by this elongated hole 34. Also, this set plate 30
As shown in FIGS. 1 to 3, a bifurcated holding portion 35 is provided at the upper end of the holding portion 35. A circular opening 36 into which the latch shaft 29 engages is formed in this holding portion.

Therefore, when it is desired to replace the type wheel 23, the carriage 20 is rotated about the guide shaft 21 and raised to an appropriate angular position. In this case, even if there is variation in the mounting position of the latch shaft 29, the latch shaft 29
is a bifurcated holding portion 3 provided on the set plate 30.
5, the set plate 30 follows the position of the latching shaft 29 and rotates around the pin 32, so that the latching shaft and the center of the opening 36 of the holding part 35 are precisely aligned. let Thus, the carriage 20 is held in the raised position, and the type wheel 23 can be replaced. After replacing the wheel, when you want to return the carriage 20 to its original normal printing state, all you have to do is raise the rear end, disengage the latch shaft 29 and the holding part 35, and rotate the carriage 20. .

In the embodiment of the invention described above, the protrusion 33 of the set plate 30 is connected to the elongated hole 34 formed in the fixing plate 31.
By engaging the set plate 30
Regulates the rotation angle of. However, in order to regulate the rotation angle of this set plate 30, a long hole is formed in the set plate 30, and the other fixed plate 31 is opened.
It is also possible to provide a structure in which a protrusion that engages with the elongated hole is provided.

Further, in the above-described embodiment, the set plate 30 was attached to the support frame (not shown) of the printer body via the fixing plate 31. However, the set plate may be rotatably attached directly to the support frame.

Furthermore, in the embodiment described above, the carriage 20
A case has been described in which this is applied to a printing device that rotates upward around the guide shaft 22. However, the present invention can be similarly applied to a printing device that is provided with a moving stage (carrier) that is guided by a guide shaft and moves along the platen, and on which the carriage is rotatable. In this case, the set plate is not a support frame, but
It can also be attached to a moving platform.

Effects According to this invention, since the set plate is rotatable to follow the position of the latch shaft of the carriage, even if there is variation in the mounting position of the latch shaft, it is not affected in any way and is extremely simple. The carriage can be set in the neck-up position.

[Brief explanation of the drawing]

FIG. 1 is a side view of the carriage part of a digital serial printer equipped with the carriage neck-up holding mechanism of the present invention, and FIG. 2 is a left side view of the set plate and fixing plate assembly used in the carriage neck-up holding mechanism of FIG. 1. Figure 3 is a perspective view,
FIG. 4 is a side view of a carriage portion of a digital serial printer equipped with a conventional carriage head holding mechanism. 20...Carriage, 29...Latching shaft, 3
0...Set plate.

Claims (1)

[Claims] 1. In a carriage head-up holding mechanism of a printing device that rotates a carriage and maintains its rotational state by engaging a latch shaft provided on the carriage with a set plate, the set plate is freely rotatable within a certain angle range. A carriage neck-up holding mechanism for a printing device, characterized in that it is attached to a printer.