JPH0431051A - Printing mechanism - Google Patents

Abstract

PURPOSE:To eliminate a positional shift between a type sheet or belt and a base stand and an excessive load on the side during operation by providing fixing parts between the base stand and the type sheet or belt in addition to the fixing places provided at the beginning and end parts of the wound sheet or belt. CONSTITUTION:When a type sheet or belt 2 is wound around a base stand 1, the beginning and end parts of the wound sheet or belt 2 are fixed to the base stand 1 and a plurality of fixing parts B are provided in addition to the places of fixing the types. An ink roller 3, under a certain pressing force, is pressed into contact with the sheet or belt 2 and a print driving part 4 is provided inside the base stand 1. When the base stand 1 rotates in the direction C, the roller 3 rotates in the direction D synchronously therewith, so that the ink is transferred on the face of the type formed on the sheet or belt 2. In the sheet or belt 2 thus fixed at a plurality of places in the winding direction, since the amount of their positional shift is not accumulated but spread, such an arrangement as to avoid the contact of a projecting part 6 with the end face of a hole 5 in the base stand can be made, whereby an out-of-register between the center of the type can be controlled.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a type ring in which a type sheet or a type belt made of a rubber material or an elastic resin material is wrapped around a cylindrical base. The present invention relates to a printing mechanism for a printer having a printer.

[Prior Art] When winding a type sheet or a type belt around a cylindrical base, a conventional type wheel secures the base and the sheet or belt only at both ends in the winding direction. It was done at

[Problem to be solved by the invention] However, conventional type wheels have the following problems.

Due to the contact load with the inking roller, the type sheet or type belt shifts on the base in the direction of the load. Therefore, the type extrusion protrusion of the sheet or belt is pressed against one side of the hole in the base, and at the same time as the type center shifts, the type extrusion load increases during printing, resulting in long-term wear and tear. Easy to occur.

Furthermore, the letters are likely to float or come off due to misalignment that accumulates in the fixed portion between the sheet or belt and the base.

Therefore, the present invention solves these problems.
The purpose is to improve the reliability of the type wheel and improve print quality.

[Means for Solving the Problems 1] In order to solve the above-mentioned problems, the type ring of the present invention, when winding a type sheet or a type belt around a base, has a type ring other than both ends of the sheet or belt in the winding direction. The present invention is characterized in that a fixing portion is provided between the base and the seat or belt.

[For use] With the type wheel configuration as described above, it is possible to prevent the type sheet or the type belt from coming off, and to regulate the amount of misalignment that occurs between the base and the sheet or belt.

[Example] Embodiments of the present invention will be described below based on the drawings.

In Fig. 1, when winding the type sheet or type belt 2 around the base 1, the sheet or belt 2 is fixed to the base 1 at both ends A in the winding direction, and at the same time, other A plurality of fixing portions B are provided at. An inking roller 3 is in contact with the sheet or belt 2 under a certain pressure, and a printing drive section 4 is provided inside the base l.

When the base l rotates in the C direction, the roller 3 rotates in the D direction and ink is transferred to the type surface formed on the sheet or belt 2. At this time, as shown in FIG. 2, due to the contact load generated between the roller 3 and the sheet or belt 2,
A misalignment occurs between the base 1 and the sheet or belt 2, and the type extrusion projection 6 passed through the hole 5 of the base becomes misaligned in the E direction.

However, in the case of a sheet or belt 2 that is fixed at multiple locations in the winding direction, the amount of misalignment is not accumulated but is dispersed, so settings must be made so that the protrusion 6 does not come into contact with the end surface of the base hole 5. This makes it possible to suppress misalignment of the printing center.

FIG. 3 shows a method of fixing between the base 1 and the seat or belt 2 in the fixing part B of FIG. 1.

FIG. 3(a) shows the fixation between the hole 7 drilled in the base 1 and the protrusion 8 formed on the seat or belt 2, and FIG. The protrusion 9 and the sheet
Alternatively, fixation is shown between holes 10 made in the belt 2.

FIGS. 3(C) and 3(d) show cases in which omissions are prevented in each case.

In addition, adhesive bonding between the base l and the seat or belt 2 may be used.

In addition, the above-mentioned fixed state in part B includes a state in which there is no looseness with a tightening margin, and a state in which there is a gap within a range that does not exceed the gap between the base hole part 5 and the protrusion part 6. means engagement in a closed state.

Further, as shown in FIGS. 4(a) to 4(d), the shape of the upper surface of the fixing portion B is not particularly limited as long as the above-mentioned fixed state can be ensured.

[Effects of the Invention] As described above, according to the present invention, the fixing portion between the base and the type sheet or belt can be added at locations other than both ends in the winding direction, which is a simple method. By eliminating misalignment between the type sheet or belt and the base and unnecessary side loads during operation, print quality and durability are improved.Also, when handling the type wheel, the sheet or Effects such as being able to prevent the belt from coming off can be obtained.

[Brief explanation of drawings]

FIG. 1 is a side sectional view of the printing mechanism of the present invention. FIG. 2 is an explanatory diagram of displacement of the type sheet or belt during operation. FIGS. 3(a), (b), (c), and (d) are diagrams showing a method of fixing between the base and the type sheet or bell 1. FIGS. 4(a), (b), (c), and (d) are views showing the top shape of the protrusion. ] Base type sheet or type belt, inking roller, print drive unit base hole, type extrusion protrusion, base hole 8.・Type sheet or type belt protrusion 9, ・Base protrusion 10, ・Type sheet or type belt hole or more

Claims (1)

[Claims] In a printing mechanism having a type ring in which a type sheet or a type belt made of a rubber material or an elastic resin material is wound around a cylindrical base, both ends of the type sheet or the type belt in the winding direction A printing mechanism characterized in that the type sheet or the type belt is wound around the base, which is provided with a fixing portion between the base and the type sheet or type belt in addition to the portion.