JPS635893Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a small printer, and more particularly to a mounting mechanism for an ink roll cassette that transfers ink to a type wheel or type drum having type characters on its outer periphery.

An object of the present invention is to provide a simple ink roll cassette mounting mechanism that is very easy to handle and does not stain hands when replacing the cassette.

Another object of the present invention is to provide an ink roll cassette mounting mechanism that has fewer parts, is inexpensive, and can further downsize the printer.

Conventionally, when installing an ink roll in a small printer, in most cases, the direction of insertion of the ink roll and the direction of the force applied by the ink roll spring to press the ink roll against the type after the ink roll is installed are almost perpendicular. It was always hot. An example of a conventional ink roll cassette mounting mechanism will be explained with reference to FIG. 1 is a type ring having type characters on its outer periphery. 3 is an ink roll impregnated with ink, and its center portion is supported by an ink roll shaft 4. When attempting to install the ink roll 3, the ink roll 3 is moved in the direction of arrow a and inserted. At this time, the ink roll shaft 4 contacts the slope 61 provided on the press lever 6, causing the press lever 6 to Arrow b while going against the spring force of roll spring 5
It is pushed away in the direction and inserted up to the bearing part 62 provided on the press lever 6. The ink roll shaft 4 inserted into the bearing part 62 receives a force in the direction of arrow c by the ink roll spring 5, and the ink roll 3
The printing type 2 and the ink roll 3 come into contact with each other with a predetermined pressure. According to this mounting mechanism, the direction of arrow a in which the ink roll 3 is inserted and the direction of arrow c in which the ink roll 3 is pressed against the type 2 are substantially perpendicular. In this mechanism, there is a layout restriction that the direction in which the ink roll 3 is inserted and the direction in which it is pressed against the type 2 must be almost perpendicular, and the ink roll 3 usually
It will be placed on the opposite side of the printing paper 7. Since the printed characters 8 are viewed in the direction of the arrow d shown in the figure, the ink roll is positioned right in front of the viewer. Having an ink roll impregnated with ink in front of you makes it easy to use and stain your hands and other parts, and it also spoils the aesthetics. Furthermore, the fact that there is a restriction on the position where the ink roll can be placed means that there is little freedom in terms of layout, making it difficult to provide a compact printer with good space efficiency.

The present invention eliminates the drawbacks of the conventional ink roll cassette mounting mechanism described above, and will be explained below with reference to FIG. In FIG. 2, 21 is a type wheel having type 22 on its outer periphery, and 23 is an ink roll whose center portion is supported by an ink roll shaft 24 and impregnated with ink. Reference numeral 25 designates ink roll springs made of wirework or the like, which are inserted between protrusions 261 and 262 provided on the frame 26, and are arranged one each at each end of the ink roll shaft 24. Reference numeral 27 denotes a groove provided in the frame 26, which serves as a guide for the ink roll shaft 24. In the present invention, the ink roll 23
This is done by inserting the ink roll 23 from below the frame 26 along the guide groove 27 in the direction of arrow g. Align the ink roll 23 with the first slope 253 of the ink roll spring 25 and follow the arrow g.
When the ink roll spring 25 is inserted in the direction shown in FIG. returns to the direction of arrow i, and the ink roll shaft 24
A force in the direction of arrow j is applied by the second slope 254 of the ink roll spring 25, and the ink roll 23
is brought into contact with the type 22 with a predetermined pressure. Here, the insertion direction of the ink roll 23 (arrow g direction) and the pressing direction of the ink roll 23 (arrow j
direction) are almost the same direction. The ink roll 23 can be removed by pulling it in the direction of the arrow k, contrary to the insertion, and in this case as well, the ink roll 23 is removed while deforming the ink roll spring 25 in the direction of the arrow h. Here, the frame protrusion 252 of the ink roll spring 25 may be fixed to the frame 26, but a protrusion 263 is provided on the upper part of the protrusion 261 to create a gap S that allows the protrusion 252 of the ink roll spring 25 to move somewhat in the direction of arrow g. It is preferable to provide one. By doing this, when inserting the ink roll 23, the ink roll spring 25 will be attached to the ink roll shaft 2.
It is pushed up by 4 and goes up by the gap S,
Thereafter, the ink roll is deformed in the direction of the arrow h, so the force when inserting the ink roll is eased, and handling becomes easier.
The ink roll 23 usually has an ink roll cover 2.
8 is attached, and the ink roll cover 28
Attachment and removal are carried out by holding a handle 281 formed integrally with the holder. The larger the handle 281 of the ink roll cover 28 is, the easier it is to handle, but increasing the size of the handle 281 requires increasing the height of the printer accordingly. In order to attach a large handle without making the printer larger,
There is a protrusion 28 near the bearing part of the ink roll cover 28.
2 will be provided. The protrusion 282 engages with the ink roll spring 25 when the ink roll 23 is attached, and the ink roll cover 28 engages with the ink roll shaft 2.
4 in the direction of arrow f, and is stored in a predetermined position. In this way, the protrusion 28
By providing the ink roll 23 and the ink roll cover 28, the ink roll 23 and the ink roll cover 28 can be arranged in a space-efficient manner. The greatest feature of the present invention is that the insertion direction of the ink roll 23 (direction of arrow g) is almost the same as the direction in which the ink roll 23 presses against the type wheel 21. This makes it possible to insert and remove the device from below. As a result, the character 3 printed on the printing paper 29
The ink roll 23 is not visible from the direction of arrow e, which is the direction in which 0 is viewed.
It won't contaminate anything else. In addition, the space below the type wheel 21 where the ink roll 23 is placed is usually a space that is easily wasted due to the layout, so by placing the ink roll here, the printer layout can be made more efficient and the The overall size can be reduced. Furthermore, other mechanisms can be placed on the opposite side of the printing paper 29 with respect to the type wheel 21, that is, the space where the conventional ink roll has been placed, which increases the degree of freedom in layout. Conventionally, an ink roll mounting mechanism required an ink roll spring, a rotating shaft of a pressing lever, etc., but with the present invention, the ink roll spring is simply inserted into the protrusion of the frame, so the number of parts is small and assembly is easy. A simple and inexpensive ink roll cassette mounting mechanism can be provided.

As described above, according to the present invention, it is possible to obtain an ink roll cassette mounting mechanism that has a small number of parts, is easy to assemble, is inexpensive, and can be downsized.
Furthermore, it is easy to handle, allows flexibility in the layout of the printer, and also provides an ink roll cassette mounting mechanism that does not stain hands or other objects with the ink roll.

As mentioned above, the effects of the present invention are achieved by attaching the ink roll cassette, which has a protrusion near the pivot point of the ink roll in the same direction as the handle, to the guide groove via a substantially dogleg-shaped spring member. The action of the dogleg-shaped spring member and the protrusion allows the ink roll cassette to automatically collapse into the printer body, allowing for efficient space utilization. Furthermore, since the ink roll cassette automatically collapses into the printer body and is supported, it can be installed with just one touch and reliably. Furthermore, when removing the ink roll cassette, all you have to do is align the protrusion and handle of the ink roll cassette with the longitudinal direction of the guide groove and remove the protrusion from the dogleg-shaped spring member. The ink roll cassette is pushed out and can be removed with one touch.

[Brief explanation of the drawing]

FIG. 1 is a side view showing a conventional ink roll mounting method, in which 1 is a type wheel having type 2, 3 is an ink roll supported by an ink roll shaft 4, 5 is an ink roll spring, 6 is a pressing lever, 9 is a hammer. FIG. 2 is a side view showing an embodiment of the ink roll cassette mounting mechanism according to the present invention, in which 21 is a type wheel having type 22, 23 is an ink roll;
4 is an ink roll shaft, 25 is an ink roll spring,
26 is a frame, 27 is a guide groove, 28 is an ink roll cover, 29 is printing paper, and 32 is a hammer.

Claims (1)

[Scope of Claim for Utility Model Registration] A type wheel, a frame member for rotationally supporting the type wheel, and a guide groove provided in the frame member for mounting an ink roll cassette containing an ink roll below the type wheel; The ink roll cassette is provided with a protrusion on the handle side of the ink roll cassette near the pivot point of the ink roll, and the protrusion rides over the approximately dogleg-shaped bent part, so that the ink roll cassette is inserted in the same direction as the ink roll cassette. 1. A mounting mechanism for an ink roll cassette, comprising: a spring member that presses the ink roll cassette against the type wheel in the direction of the ink roll cassette and causes the ink roll cassette to fall into the frame member.