KR880001141B1 - Serial printer frame - Google Patents

Abstract

The platen and guide bar are mounted in parallel relationship by means of a cylindrical shaped ends secured to two side plates of the frame. The latter are plane metal sheets identical to each other and have dihedral-shaped housing for the positioning of each of the ends by contact in a generating line of each side of the corresponding one of the dihedrals. Mechanisms are provided for firing each of the ends into a corresponding one of the housings of the side plates so as to provide, on the ends, a force directed towards the apex of the corresponding dihedral.

Description

Serial printer

1 is an exploded perspective view of a serial printer structure according to the present invention.

2 shows the outline of the side plate of FIG.

3 is a front view of the rider used in FIG.

4 is a cross-sectional view taken along the line "A-A" in FIG.

* Explanation of symbols for main parts of the drawings

1A, 1B: Side plate IC: Base

2: axis 3: platen

4,5: Bar BAR 6,6A, 6B: Bearing

11A, 11B, 12A, 12B, 21, 21A, 21B: Rider

13A, 13B, 14A, 14B, 24,24A, 24B: screw

The present invention relates to a serial printer structure.

More specifically, the present invention relates to an apparatus for fixing a platen and a print carrier guide bar to the structure.

In general, the structure of a serial printer is composed of two side plates with a housing that is securely supported by inserting the base and the end of the platen and the end of the printing carrier guide bar.

As the print carriage on which the print head is installed moves along the guide bar, different printing positions are set along the printing line.

Examples of such printers are described in US Pat. Nos. 4,044,882, 3,970,193 and 4,229,114.

The print carrier is driven by the motor through the flexible media of the toothed belt.

Tractor or pin wheel. Multi-line printable paper is supplied by a suitable feeder, such as, or by a cylindrical platen that rotates on an axis and acts with a suitable pressure roller that presses the paper onto the platen.

For serial printers, especially printers of good quality, the platen and print carrier guide bars must be completely parallel.

When the platen and printing carrier guide bar are completely parallel, the distance between the print head and the platen becomes constant along the entire printing line, so that a constant impact energy is obtained and the printed characters are the virtual midline of the printing line. Is fully matched against.

However, when the guide bar and the end of the printing plate enters the housing in the wrong side of the printer, and the guide bar or the end of the printing plate and the side plate housing is loose, the parallel is not maintained well.

Conventionally, after the assembling step, during the finishing operation step, using a plate with an adjustable fine plate that can compensate for the looseness between the housing and the end of the platen and the position of the housing of the side plate can be eliminated. The guide bar was firmly fixed to the side plate with the device to maintain parallelism between the platen and the print carrier guide bar.

These adjusting devices have a fixed and measuring screw which acts in the radial direction or in parallel with the face of the side plate.

However, these methods are very complex and expensive, require manual finishing and use a device that can measure the degree of parallelism.

Such a shortcoming can be solved by the simple and inexpensive serial printer structure according to the present invention, which can obtain the required parallel state during the assembly step without finishing work.

In the present invention, the above advantages can be obtained by fixing the platen and printing carriage guide bar in a suitable housing which is planar and arranged on the same side plate.

The housings on each side plate are easily made and "V" shaped.

Worn dies and punches affect the housing on the side plates.

A rider can be secured firmly to the two sides involved by using a rider that applies moderate pressure to the ends of the platen and guide bar towards the vertices on both sides and loosens the elements.

In another aspect of the present invention, the clamping rider is secured to the panel by means of a screw having a head portion whose end that is clamped to the side plate perpendicularly to the face of the side plate through the rider.

The rider pressure exerted on the platen and guide bar ends is obtained by the interaction of the screw head with the smaller tip and the corresponding housing with the smaller tip.

Between the end of the platen or guide bar and the point where the rider contacts the axis of the screw housing in the side plate between the point of contact of the end of the platen or guide bar and the rider and the axis of the housing where the end on the rider becomes smaller Is greater than the distance.

The rider should be made of a plastic material with adequate elasticity.

Based on the drawings showing an embodiment of the present invention will be described in detail the features of the present invention.

Figure 1 illustrates a portion of a serial printer architecture essential for understanding the present invention.

In the structure of FIG. 1, the two side plates 1A and 1B, which are rigidly connected to the base IC, are made of metal thick enough to support the device firmly.

Since the two side plates 1A and 1B are flat and identical to each other, they can be manufactured using one die.

The side plates are affected by the frame's error and wear.

The side plates 1A and 1B of FIG. 1 support the shaft 2 on which the guide bars 4 and 5 and the cylindrical platen 3 are provided.

A print carriage (not shown) that moves axially along the guide bar is mounted to the guide bar 4 by bushings or bearings.

The guide bar 5 serves as a guide rail that prevents the print carriage from rotating around the guide bar 4.

The platen may be fixed or rotated. The platen shown in FIG. 1 is to rotate. The end of the shaft 2 is inserted into two bearings 6A and 6B contained in the two housings 7A and 8B of both side plates 1A and 1B.

The end of the shaft 2 projects outward from the side plates 1A and 1B so that it can be engaged with a motor device (not shown).

The ends of the guide bars 4 which directly enter into the two housings 8A and 8B of the side plates 1A and 1B project outward from the side plates 1A and 1B.

The end of the guide bar 5 penetrates through the two housings 9A and 9B and engages with the two holes 10A and 10B of the side plates 1A and 1B.

2 is a partial view of the side plate and the contour.

The housing 7 in the form of a "V" consists of two surfaces which support the bearing 6 so that it can be stably installed in contact with the wires 30 and 31 of the housing.

Similarly, the housing 8 in the form of a "V" is also composed of two surfaces which support the end of the guide bar 4 so that it can be stably installed in contact with the housing lines 33 and 34.

Within the tolerance of machining error, there is no problem in installation since the distance between the bearing 6 axis and the guide bar 4 axis is the same in the two side plates.

Considering FIG. 1 again, the bearings 6A and 6B are stably pressed in the housings 7A and 7B by two riders 11A and 11B.

Such riders, which are preferably made of plastic products, consist of semicircular arc bodies 12A, 12B on which bearings 6A, 6B are installed.

Two ears of the body 12A, 12B protrude outwardly, and holes 15A, 15B, 16A, 16B are formed in the ear portion.

The rider is fixed to the side plates 1A and 1B by screws 13A, 14B, 13B and 14B.

The screw is screwed through the holes 15A, 16A, 15B and 16B into the housings 19A, 20A, 19B and 20B, which are threaded in the side plates.

Similarly, the end of the guide bar 4 is stably pressed to the housings 8A and 8B by two riders 21A and 21B.

Riders 21A and 21B are fixed to the side plates by screws 24A and 24B.

Screws 24A and 24B are screwed into housings 25A and 25B which are threaded in the side plates through the second holes 23A and 23B of the rider.

The screws 13A, 13B, 14A, 14B, 24A, 24B are perpendicular to the side plate surface and act in parallel to the platen and guide bars.

When the screws are tightened, the riders 11A, 11B, 21A, 21B are pressed against the side plates.

It will be understood in the following description how the rider tightens the ends of the bearings and guide bars by force of the screws, and how the ends of the bearings and guide bars (4) are pressed into the housing of the side plates.

Reconsidering FIG. 2, which shows a part of the side plate, from the line 38 of the guide bar 4 to the threaded housing 25 axis when the guide bar 4 contacts the face 8. Distance is "H1".

FIG. 3 is a front view of the rider and FIG. 4 is a sectional view taken along the plane "A-A" of FIG.

The rider has a top opening 22 and a bottom opening 23. The diameter of the top opening 22 into which the end of the guide bar enters is slightly larger than the diameter of the guide bar to facilitate insertion.

The bottom opening 23 into which the fixing screw enters consists of a cylindrical housing 35 and a conical housing 36 with a smaller end.

The distance from the axis of the conical housing 36 parallel to the axis of the top opening 22 to the line 37 of the top opening 22 is "H".

"H" is smaller than "H1".

The diameter D1 of the cylindrical housing 35 is "D + (H1-H) when the outer diameter of the screw 24 to penetrate the cylindrical housing 35 and clamped to the housing 25 of the side plate is" D ". Should be equal to

Under these conditions, the guide bar 4 and the side plate 1 are assembled as follows.

The end of the guide bar 4 lies on the face 8.

The end of the guide bar protruding from the side plate is inserted into the top opening 22 of the rider 21, and the rider is attached to the side plate while matching the center axis of the bottom opening 23 and the housing 25.

This arrangement is possible because the diameter D1 of the cylindrical housing 35 is smaller than "H1" but the screw is larger than the diameter and larger than the diameter of the housing 25.

The screw 24 is inserted into the bottom opening 23 and clamped into the housing 25.

When the screw 24 is clamped into the housing 25, the screw 24 is placed in an eccentric position with respect to the axis of the lower opening 23.

In other words, the screw axis is located opposite the line 37 with respect to the axis of the conical housing 36.

Therefore, when the screw is tightened, the end portion of the head begins to contact the lower surface of the conical housing 36 and pulls the rider 21 down so that the conical housing 36 is coaxial with the screw. All.

This shift is prevented because of the contact between the guide bar and the rider on line 37, but thanks to the rider's resilience. The guide bar end is stably mounted on the face 8 of the housing by the force indicated by "F" in FIG.

In this case, by tightening with two screws instead of one screw and extending the rider's body inward from the outer surface of the side plate, even if the rider's body is intended to act on the bearings 6A, 6B, the rider 11A ( The function performed by 11B) is the same.

This clamping device allows the side plates 1A and 1B to be blanked without the use of conventional rider supports or fixed wings that act in the same direction of force as the clamping screw should perform. It can be a flat metal element that can be obtained by the bending action.

Therefore, the problem of deformation caused by the bending action performed after the blanking can be avoided.

The above-described structure is only one example of the present invention and can be modified in various forms.

As an example, the rider can be used for bearing installation of the platen and the guide bar can be installed in a corresponding housing with another device.

Also in the structure of the rider, the cylindrical housing 35 can be made in other forms.

For example, the housing may be a groove with a semicircle end that is the same diameter and width of the screw to fit therein.

Claims (2)

It consists of two side plates, a base, a printing plate and a guide bar for supporting the print carrier, and the printing plate and the guide bar are installed in parallel by a cylindrical end fixed to the side plate, and the side plates are the same. It is of flat metal and has a two-sided housing in which the cylindrical end can enter the side plate, and a fastening device is directed toward the apex of the corresponding two sides to secure the cylindrical end in the housing of the side plate. And a force applied to the end of the cylinder. 2. The screw according to claim 1, wherein the fixing device comprises at least one rider and a tapered head screw for securing the rider to the side plate, the first opening with the cylindrical end inserted into the rider and the screw and its head portion. There is a housing with a smaller end, and there is a second opening on the side plate which receives the screw perpendicular to the side plate, one of the second opening on the side plate and one of the housings on the rider are installed on two corresponding faces The other is installed for the first opening in the rider, so that by screwing the screws into the side plates, the head of the screw interacts with the rider in the housing where the end becomes smaller, towards the apex of the two faces at the end engaged with the rider's first opening. A serial printer characterized by applying force.

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