JPS6111270A - Printer - Google Patents

Abstract

PURPOSE:To vary the pressing force to the platen side by a method in which the stop position of a fixer to press a paper cutter onto the platen side and an aperture is provided between the fixer and the platen. CONSTITUTION:When setting a paper 10, a paper cutter 2 is counterclockwise operated around a strut 12 and rotationally moved until the contact portion 1A of the fixer 1 of the cutter 2 comes into contact with the platen shaft 8A. In this case, the sliding portion 1B of the fixer 1 rotatably fixed to the cutter 2 is put into a state, as shown in the Fig., while being slided on the shaft 8. Although the contact portion 1A of the fixer 1 is always pressed on the shaft 8A by a helical spring 4, when the position regulating part 1C is contacted with the cutter 2, an aperture delta1 is provided between the contact portion 1A of the fixer 1 and the platen shaft 8A.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to an impact type printing device using a needle, type, etc., or a non-impact type printing device using a heat sensitive, inkjet, discharge, etc. type.

Conventional structure and its problems Conventionally, the paper feeding mechanism of this type of printing device has been structured as shown in FIG. In FIG. 1, reference numeral 1 has a stopper portion 1C that is rotatably supported by a post 3 that engages with the paper cutting member 2, is constantly pressed against the shaft 8A side of the platen 8 by a helical spring 4, and comes into contact with the paper cutting member 2. A fixing device for the paper cutting member 2, 5 is a helical spring supported by a column 6 engaged with the side plate and a column 7 engaged with the paper cutting member 2, 8 receives printing by the print head 11, and is attached to the side plate (not shown). 9 has a pinch roller which rotates while pressing the paper 1o against the platen 8 by the force of a leaf spring; 13 has a tractor claw 13m which engages with a hole in the paper 10; , a paper feeding unit that supplies the paper 10 to the platen 8 side by rotating the tractor claw 13A in the true direction; and 15 a paper guide that guides the paper 10 to the printing head 11 side with a certain gap from the platen 8; Component 14 is tractor claw 1
This is a drive shaft connected to a motor that rotates the three people.

Gears are fixed to eight shafts of the platen 8, and mesh with the gears fixed to the drive shaft 14 to rotate in synchronization.

The paper cutting member 2 is rotatable around the support 12, and when inserting paper, it is rotated clockwise (direction B) to enlarge the opening with the platen 8, and after insertion, it is rotated counterclockwise. The contact portion 1A of the fixture 1 of No. 2 is connected to the shaft 8 of the platen 8.
Bring it into contact with A. At this time, the sliding part 1B of the fixture 1 rotates around the column 3 while sliding on the shaft 8A of the platen 8,
One contact member comes into contact with the shaft 8A of the platen 8. This fixture 1 is pressed toward the platen 8 by the force of a helical spring 4. The force is shown in Figure 2.

As shown in FIG. 2, the fixture 1 is always pressed against the eight platen shafts when the paper cutting member 2 is in contact with the platen 8. In this case, paper feeding is adversely affected. The problems will be explained below. These printing devices use a wide variety of paper types under various conditions.

When used in a high temperature atmosphere, the diameter of the rubber platen increases due to thermal expansion. The amount of paper wrapped around the platen is greater than the amount of paper that is sent by the tractor. As a result, the claws of the tractor and the holes in the paper no longer match, the paper holes are destroyed, and furthermore, the paper rides on the claws of the tractor. This occurs with thin paper.

On the other hand, when used in a low-temperature atmosphere, the diameter of the rubber platen decreases due to contraction, and the amount of paper fed by the tractor becomes larger than the amount of paper wrapped around the platen and fed. As a result, walnuts occur in the paper between the tractor and the paper cutting member. In either case, the paper feeding accuracy and feeding condition are adversely affected.

Purpose of the Invention The present invention is intended to solve these problems, and by regulating the stopping position of the fixture that presses the paper cutting member against the platen side and providing a gap between it and the platen shaft,
This changes the force pressing against the platen side.

Structure of the Invention The present invention is intended to achieve the above-mentioned object, and is attached to a paper cutting member that contacts a platen, and when the platen rotates clockwise, the paper cutting member moves toward the platen side due to friction on contact with the platen shaft. A regulating part is provided on the fixture to be pressed, and a certain amount of clearance is provided between the fixture and the platen shaft.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention is shown in FIG. 3, in which the same parts as in FIG. 1 are designated by the same numbers.

In FIG. 3, the paper cutting member 2 is operated counterclockwise around the support 12 when the paper 1° is attached, and one contact portion of the fixture 1 of the paper cutting member 2 comes into contact with the platen shaft 8A. Rotate and move at 1 that touches. At this time, the fixture 1 rotatably fixed to the paper cutting member 2 settles into the state shown in FIG. 3 with the sliding portion 1B sliding on the platen shaft 8A.

This fixture 1 is always pushed by the helical spring 4 in the direction of the platen shaft 8, but when the position regulating part 1C comes into contact with the paper cutting member 2, it is fixed. A gap of δ1 is provided between one contact portion of the tool 1 and the platen shaft 8A.

In the paper feeding state, the paper cutting member 2 attempts to rotate clockwise due to the paper 10 wound around the platen 8. In a normal paper feeding state, the paper cutting member 2 is pushed toward the platen 8 by a spring 6 disposed between a support column fixed to a side plate, and a thin plate-like spring welded to the platen side of the paper cutting member 2. 17 comes into contact with the platen 8,
The paper 10 in between is pressed against the platen 8. When this printing device is used in a high-temperature atmosphere, the thermal expansion of the platen 8 is greater than the thermal expansion of the tractor, and the paper 10 is pulled toward the platen 8. When the perforation comes into contact with the thin plate spring member 17, the paper cutting member 2 only closes the gap 61 in FIG.
is pushed up, the winding of the paper 10 around the platen becomes open, and the paper 1o pulled toward the platen 81i111 returns to its normal position on the tractor. When copying paper is used, the overall thickness of the paper increases and the strength of the tractor hole is also large, which reduces the effect of being pulled toward the libra latte 8, but the strength of the perforation folds also increases, and the paper cutting member 2
However, after the paper cutting member 2 is moved by the gap δ1 in Fig. 3, the helical spring 4 presses the stationary furniture 1 against the platen shaft 8 (Fig. 4 b),
Prevent floating condition.

The paper cutting member 2 is pushed toward the platen 8 by the helical spring 5, and the force of the pushing force by the helical spring 5 is curve a in FIG. 4, and the gap a of the fixture 1 is in the mm range. It moves lightly.

Effects of the Invention As described above, according to the present invention, the following effects can be obtained.

(1) When used in a high temperature atmosphere, stable paper feeding can be achieved even if there is a difference in paper feeding amount between the platen and the tractor section.

@) It can be realized without adding any parts to the conventional structure. (3) Great effects can be obtained without increasing costs.

[Brief explanation of the drawing]

Fig. 1 is a side view showing a paper feeding section in a conventional printing device, Fig. 2 is a diagram showing the relationship between the displacement of the fixture and the force pushing the platen shaft in the conventional configuration, and Fig. 3 is an example of the present invention. FIG. 4 is a side view showing the configuration of a paper feeding section of a printing device using a winding example. FIG. 4 is a diagram showing the relationship between the displacement of the fixture and the force with which the paper cutting member presses the platen shaft according to the present invention. 1...Fixing tool, 2...Paper cutting member, 8...
...Platen, 10...Paper, 11...
...Print head, 13...Tractor, 17.
...Thin spring. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 → 0' (mm) Figure 3 Figure 4

Claims (1)

[Claims] a paper supply unit that rotates a tractor that supplies paper via a transmission medium such as a gear and a belt using a motor drive source;
The platen receives printing from the print head while wrapped around the paper sent from the paper supply unit and rotates in synchronization with the tractor, and when the paper is ejected from the platen, it prevents the paper from floating and cuts the paper. The paper cutting member is attached to the paper cutting member that comes into contact with the platen, and comes into contact with the platen shaft when the platen rotates clockwise.
A printing device in which a regulating part is provided on a fixture that presses a paper cutting member against the platen side by friction, and a certain gap is provided between the fixture and the platen shaft.