JPS5924522Y2 - type wheel - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a petal-shaped type wheel used in a serial printer.

Multiple highly elastic arms made mainly of carbon fiber protrude radially from the center like flower petals, and a type ring with type attached to the tips of these multiple arms is attached to the print head of a serial printer. , after rotating the type ring to stop the desired type at the printing position, a printing hammer is driven to strike the type toward the platen, and the type hits the ink ribbon and recording paper against the platen to perform printing. Alprinter is well known.

In some serial printers of this type, in order to increase the number of characters provided on the type wheel, two types of type are formed at the tip of each arm, thereby doubling the type ring.

By the way, as shown in Fig. 1, such a type ring with double type rings is located at the tip (outside) of arm 1'.
When printing on the recording paper 4' by striking the printed characters 2' provided on the lower part with the printing hammer 3', the lower printed characters 5'
The ink ribbon 7' also jumps out toward the platen 6', causing the ink ribbon 7' to come into contact with the recording paper 4', staining the recording paper 4' with so-called underprints.

In particular, in the case of a multicolor ink ribbon with a black area and a red area on the top and bottom two levels, ink of a color different from the color of the printed characters adheres to the recording paper 4', making it very unsightly. .

Also, when printing on the recording paper 4' by shifting the type wheel upward and striking the type 5' with the printing hammer 3', the type 2' similarly flies out toward the platen 6' due to inertia, causing the so-called upper Printing occurs and causes the same inconvenience as above.

The present invention is a novel invention that improves the above-mentioned drawbacks of the conventional type.The purpose of the present invention is to provide a serial printer that uses a type wheel with multiple rows of type wheels, so that unnecessary type can be moved toward the platen during printing operation. To provide a printing mechanism for a serial printer that does not cause the inconvenience of contaminating the surface of recording paper due to movement.

Next, one embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 2 shows a type wheel according to the present invention, in which A is a plan view and the opening in the figure is a sectional side view of a main part.

In the figure, reference numeral 1 denotes a mounting portion for the type wheel A, which is shaped like a thick disk and has a mounting hole 1a formed in the center.

A plurality of flexible arms 2 that are flat in the radial direction protrude from the sides of the attachment portion.

Inner type 3 is formed on one surface near the tip of the arm 2.

The arm 2 extends further toward the tip than the type 3, and outer type 4 is formed on the same surface as the type 3.

Between the type characters 3 and 4, the arm 2 is bent in the opposite direction to the plane on which the type characters 3 and 4 are provided.

Next, a printing operation using the type wheel A having the above-described configuration will be explained.

First, in order to print using the (inner type) 3 provided in the middle of the arm 2, as shown in Fig. position)
Then, the printing hammer 5 is driven to move the type 3 from the dotted line position toward the solid line position, that is, toward the platen 6.

Note that 7 is an ink ribbon and 8 is a recording paper.

In this printing operation, the type 3 collides with the platen 6,
At this time, the type 4 moves toward the platen due to large inertial force, but since the arm 2 between the type 4 and the type 3 is bent, the type 4 moves the ink ribbon 7 and the recording paper 8 toward the platen. without pressing to the side, the type 4 therefore does not contaminate the recording paper 8.

Next, in order to print using the type 4 provided at the tip of the arm 3, as shown in Fig. 4, the entire type ring A is shifted downward to move the type 4 to the printing position (the position shown by the dotted line). After the movement, the printing hammer 5 is moved to move the type 4 from the dotted line position to the solid line position.

In this printing operation, the type 4 collides with the platen 6,
At this time, the type 3 moves toward the platen due to a large inertial force, but since the arm 2 between the type 3 and the type 4 is bent, the type 3 is moved closer to the ink ribbon 7 than in the conventional device. Since they are far apart, even if the type 3 moves in the direction of the ink ribbon 7 due to inertia, it will not come into contact with the ink ribbon 7.

Therefore, the recording paper 8 is not contaminated by this printing operation.

As explained in detail above, the present invention is a type wheel in which two types are arranged at intervals at the tips of a plurality of arms protruding in the radial direction, and the arm between the types is attached to the types. Since it is bent in the opposite direction to the surface, when one of the two types hits the platen, the other type will not cause the ink ribbon to come into contact with the recording paper, and therefore, the ink ribbon will not touch the recording paper. Unlike serial printers, there is no inconvenience such as adhesion of ink to the recording paper when printing, and high-quality printing is guaranteed.

[Brief explanation of the drawing]

Figure 1 is a configuration diagram showing a conventional serial printer, Figures 2 to 4 are an embodiment of the present invention, Figure 2A is a plan view of the type wheel, and the opening in the figure is a side cross-section of the main part. FIG. 3, and FIG. 4 are explanatory diagrams of the printing operation. In the figure, A is the type ring, 1 is the mounting part, 2 is the arm, 3 and 4
5 is a printing hammer, 6 is a platen, 7 is an ink ribbon, and 8 is a recording paper.

Claims (1)

[Scope of utility model registration request] In a petal-shaped type wheel used in a serial printer, in which outer type and inner type are arranged at intervals at the tips of multiple arms protruding in the radial direction, the outer type and the inner type are arranged at intervals. The arm between the two types is bent in the opposite direction to the surface on which both types are attached, and when the inner type faces the printing hammer, the back surface of the inner type and the striking surface of the printing hammer are almost parallel, and the outer type is The type ring is characterized in that when the type ring faces the printing hammer, the back surface of the outer type and the striking surface of the printing hammer are inclined so that the gap between the two surfaces gradually narrows toward the upper end of the outer type.