JPS5935398Y2 - Type mark detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a type mark detection device suitable for preventing malfunction and damage of type mark detection devices used in line printers and the like.

As shown in FIG. 1, a type mark detection device for accurately detecting a type mark 3 indicating the position of a type 2 on a type belt 1 used as a type conveyor in a line printer or the like has conventionally used a drive pulley 4 of a type belt 1. and an electromagnetic pickup 5.

By the way, in a printing device such as a line printer, a plurality of consumables such as printing paper 6 and ink ribbon 7 are arranged side by side along the printing position, facing the type belt 1 supported by the type belt drive pulley 4. The printing hammer 8 is placed between the printing hammer 8 and the printing hammer 8 to accurately print the characters to be printed at the printing position on the printing paper 6 based on the output signal obtained from the type mark detection device. .

At this time, consumables such as the ink ribbon 7 and the printing paper 6 are strongly hit by the printing hammer 8, so they are severely consumed, and ribbon waste, paper waste, etc. are generated.

The ribbon waste and paper waste are carried by the type characters 2 and type marks 3 of the type belt 1 in the direction of rotation of the type belt 1.

As a result, this ribbon waste and paper waste is compressed by the wedge effect of the gap 78, becomes a hard mass, and enters the gap a of the type mark detection device, thereby preventing the positional shift of the electromagnetic pickup 5 forming one of the type mark detection devices. This has the major drawback that it may cause the electromagnetic pickup 5 to have a reduced output, disturb the printing timing, or cause damage.

If the above-mentioned defect occurs in the type mark detection device, it becomes impossible to accurately generate the type mark signal, which is the basic signal of the printing device, so it is considered a fatal defect of this type of printing device. Some typos, printing errors, and printing become impossible.

Incidentally, the printing apparatus shown in FIG. 1 has a function of displaying a certain kind of alarm and stopping printing when a malfunction occurs in the type mark detection device.

SUMMARY OF THE INVENTION An object of the present invention is to provide a type mark detection device that eliminates the drawbacks of the prior art described above and can prevent displacement and damage of the type mark detection device.

In the present invention, when ribbon waste and paper waste enters the gap a between the type band 1 supported by the type belt drive pulley 4 forming the type mark detection device and the electromagnetic pickup 5, the ribbon waste is removed by a wedge effect in the gap a. Focusing on the fact that paper waste is compressed and hardened, the present invention is characterized in that at least one of the electromagnetic pickup 5 and the portion of the type belt 1 corresponding to the electromagnetic pickup 5 is provided movably in the thickness direction of the type belt 1. That is.

An embodiment of the present invention will be described below with reference to FIGS. 1 and 3.

1 is a type belt and a type belt drive motor 1 shown in FIG.
0 by belt 11. It is supported by a pulley 4 driven via an intermediate pulley 12 and a transmission rod 13, and travels in a straight line in the horizontal direction.

There is a type mark 3 corresponding to the type character 2 on the type belt 1, and the type mark 3 faces the type mark 3 as the type belt runs for a certain period of time, and is picked up at regular intervals by an electromagnetic pickup 5 for generating a type mark signal. generates the output of

This type of printing device formats this constant output and uses it as a basic signal for print timing management.

14 is a holder for the electromagnetic pickup 5.

Reference numeral 15 in FIG. 3 is a stabilizer for the type belt 1, which is a member forming one side of the type mark detection device of the present invention.

The stabilizer 15 is urged by a spiral 17 held by a stabilizer holder 16 and is supported movably in the thickness direction of the type belt 1, so that the drawbacks mentioned in the conventional example can be overcome. .

That is, before the ribbon waste, paper waste, etc. that enter the gap a formed by the electromagnetic pickup 5, the type belt 1, and the type mark 3 start to harden due to the wedge effect of the gap a, the spring 17 that biases the stabilizer 15 moves the type. The electromagnetic pickup 5 and the type belt 1 can be protected since it retreats in the thickness direction of the belt 1 and removes foreign matter such as ribbon debris as the type belt 1 runs, and this is a fatal flaw in this type of printing device. The above-mentioned drawbacks can be prevented.

Even if an alarm indicating that printing is temporarily disabled due to the influence of the ribbon waste etc. is displayed and the printing device stops, the stabilizer 15 of the type mark detection device
Since the printer has returned to the normal position by step 7, the alarm can be canceled and the printer can be reset and printed again.

FIG. 4 is an explanatory diagram of main parts showing a modified embodiment of the present invention.

Holder 14 that supports the electromagnetic pickup 5 shown in FIG.
Even if the side is movable in the thickness direction of the type belt 1, the same effect as in this embodiment can be obtained.

The holder 14 is rotatably supported by a pin 18, and one end of the holder 14 is biased with an appropriate pressure by a spring 17 and a stopper.

According to the present invention, ribbon waste and paper waste that has entered the gap in the type mark detection device can be compressed by the wedge effect of the gap and removed before it hardens, which is a fatal flaw in this type of printing device. It is possible to prevent omitted characters, incorrect printing, or an inability to print.

[Brief explanation of the drawing]

1 and 2 are perspective views and side views showing the main parts of a printing device equipped with a conventional type mark detection device, and FIG. 3 is a plan view of the main parts showing an embodiment of the type mark detection device of the present invention. ,
FIG. 4 is a plan view of main parts showing another embodiment of the type mark detection device of the present invention. 1: Type belt, 2: Type, 3: Type mark, 4: Drive pulley, 5: Electromagnetic pickup, 6: Print paper, 7: Ink ribbon, 8: Print hammer, 9 Nibraten, 10: Type belt drive motor, 11 : Belt, 12: Intermediate pulley, 13: Transmission shaft, 14: Holder, 15 Stabilizer, 16: Stabilizer holder, 17: Suffling,
18 Nipin, 19: Stoppa, a: Gap.

Claims (1)

[Scope of Utility Model Registration Claim] Type bell I that runs almost horizontally along the printing position.
A type mark detection device consisting of an electromagnetic pickup installed at a predetermined distance from the surface of the type mark in order to detect the type mark on the type mark, comprising a holder for holding the electromagnetic pickup, and a holder for holding the electromagnetic pickup, and a type belt that connects the holder with the tip of the holder. A type mark detection device comprising a spring that pushes the spring to the side, and a collar that holds the rear end of the spring and prevents the front surface of the holder from moving beyond a predetermined amount.