JPH02188355A - Paper transporting mechanism - Google Patents

Abstract

PURPOSE:To carry out the constant traveling independently of the kind of paper by detecting the tilt of a tension plate installed in a traveling part for a continuous paper and varying the press-contact force of a pair of paper transport rollers. CONSTITUTION:A tension plate 2 which can vary angle is installed midway in a traveling part for a paper 1, and the traveling state of the continuous paper 1 is always detected by a detection part 3. The signal detected in the detection part 3 is supplied into a control part 7, and transmitted to a varying mechanism 5 for the press-contact of a transport roller 4, and a cam 6 is revolved, and the press contact force of the transport roller 4 is varied. In the case where the continuous paper 1 is thin, the pulling force on the transport roller 4 increases, and the lowering the tension plate 2 is detected by the detection part 3, and transmitted to a pressure varying mechanism 5, and the pressure of the transport roller 4 is adjusted, and a prescribed pulling state is restored. Therefore, the paper 1 can be travelled in the stable state.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to paper feeding in high-speed electrophotographic printers that use continuous paper, and particularly relates to a paper that maintains a constant paper feeding even when the type of paper used changes. Regarding the structure of the transport mechanism.

[Conventional technology]

Conventionally, this type of paper conveyance mechanism conveys the paper by pulling the paper by driving one of a pair of rollers with a fixed pressure.

[Problem to be solved by the invention]

Therefore, since the above-mentioned conventional paper transport mechanism pulls the paper using a pair of transport rollers with a fixed pressure contact force, it is possible to The feeding condition of the paper changes, and during the paper feeding, the paper may become loose, or the paper may be torn due to excessive pulling, resulting in a 1-fold flaw.

[Means to solve the problem]

The paper transport mechanism of the present invention is provided with a tension plate whose angle changes in the paper transport section, and when transporting the paper, a detecting section of the tension plate detects the inclination, and one of the pair of paper transport rollers transports the paper. The pressure-contact force variable mechanism has a mechanism that always carries out a constant sheet conveyance by varying the pressure-contact force of the pair of paper conveyance rollers.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

Referring to FIG. 1, continuous paper 1 passes through a tension plate 2 in the middle of a feeding section, and is pulled and fed by a pair of paper transport rollers 4.

The angle of the tension plate 2 in the middle of the feeding section is changed. Each time the continuous paper 1 passes, the tension plate 2 always detects the feeding state of the continuous paper 1 by its detection section 3.

The signal detected by the detection section 3 of the tension plate 2 is supplied to the control section 7, which controls the pressure variable mechanism 5 of the paper conveyance roller 4.
can be conveyed to. The transmitted signal causes the cam 6 of the variable pressure mechanism 5 to rotate to change the pressure on the paper conveyance roller 4.

When the paper conveyance roller 4 is pulling the continuous paper 1 with a specified pressure, the tension plate 2 remains horizontal and is not detected by the detection unit 3. When the tension of the continuous paper l becomes weaker, the tension plate 2 rises, and the sensor 3a of the detection unit 3,
Detected at 3b. Under the control of the control unit 7, the cam 6 of the variable pressure mechanism 5 of the paper conveyance roller 4 is rotated to increase the pressure on the paper conveyance roller 4 and return it to the specified pressure.

On the other hand, when the tension of the continuous paper 1 increases, the tension plate 2 lowers and is detected by the sensor 3a of the detection section 3. Under the control of the control unit 7, the cam 6 of the variable pressure mechanism 5 of the paper conveyance roller 4 is rotated to weaken the pressure of the paper conveyance roller 4 and return it to the specified pressure so that the tension plate 2 is always kept horizontal.

〔Effect of the invention〕

As explained above, the present invention detects and immediately detects when the tension plate is lowered due to strong tension on the continuous paper by the paper conveyance roller, such as when the continuous paper is thin, when the continuous paper is fed. Adjust the pressure with the variable pressure mechanism of the paper conveyance roller to return it to the specified tension state, or conversely detect when the tension of the paper conveyance roller becomes weak and the tension plate rises, such as when continuous paper is thick. Immediately adjust the pressure using the variable pressure mechanism of the paper conveyance roller to return to the specified tension state. Therefore, as long as the paper feed is set in a stable state, even if the size, thickness, and surface treatment of the continuous paper changes, the tension plate detection part in the middle of the paper feed section and the variable pressure mechanism of the paper transport roller can be used. This allows paper to be fed in a stable manner at all times.

[Brief explanation of the drawing]

FIG. 1 is a side view showing a paper conveyance mechanism according to an embodiment of the present invention. 1...Continuous paper, 2...Tension plate, 3...Detection section, 3a...Detection section sensor 3b...Detection section sensor 3c・
...Detection unit sensor 4... Paper transport roller, 5... Pressure variable mechanism, 6... Cam, 7... Control section. Agent Patent Attorney Susumu Uchihara

Claims (1)

[Claims] A tension plate provided in a paper transport unit that transports continuous paper, a detection unit that detects the inclination of the tension plate, a pair of paper transport rollers that transport the paper, and a pressure contact force between the pair of paper transport rollers is changed. A paper conveyance mechanism characterized by having a variable pressure mechanism.