JPH04278376A - Paper clamper in printer - Google Patents

Abstract

PURPOSE:To increase a clamping force by' a method wherein in the present clamper in which upper and lower clamping members are pivotally fixed at one-side ends thereof and clamp paper at the other ends thereof, a paper depressing surface of one clamping member is made of an elastic pressing member, and a paper depressing surface of the other clamping member is made of a hard and high-friction material. CONSTITUTION:An upper clamping member 15 and a lower clamping member 17 are pivotally fixed by a journal 3 at one-side ends thereof. The clamping members 15, 17 are respectively provided with a paper depressing surface at the other ends thereof. In this case, the paper depressing surface of the upper clamping member 15 is made of a hard and high-friction material 16 formed by securely fixing ceramic particle or by attaching sand paper or the like. On the other hand, the paper clamping surface of the lower clamping member 17 is made of an elastic pressing member 18, such as a rubber plate or a synthetic resin elastomer plate. In this manner, even if dust or other foreign particle is interposed, the foreign particle is absorbed by the elastic pressing member 18, whereby the reduction of a frictional force can be prevented.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper clamp device for a printer that clamps one end of a paper for printing.

0002

2. Description of the Related Art FIG. 2 is a side view of a conventional printer paper clamp device disclosed in, for example, Japanese Unexamined Patent Publication No. 2-132471. In the figure, reference numeral 1 denotes a clamping device for the paper 2, in which the paper 2 is clamped at the other end sides of an upper clamp member 4 and a lower clamp member 5, one end of which is rotatably supported by a support shaft 3. Retained. A friction plate 5 made of an elastic body is fixed to the surface of one of the clamp members 4 and 5, for example, the lower clamp member 5, which presses against the sheet 2, and a spring 7 applies a load necessary for clamping.

In addition, 8 is a thermal head, 9 is a platen roller, 10 is a pinch roller, 11 is an ink sheet, 1
2 is an ink sheet take-up roll, and 13 is an ink sheet supply roll.

Next, the operation will be explained. The leading edge of the paper 2 is sandwiched between a friction plate 6 provided on an upper clamp member 4 and a lower clamp member 5, and after being clamped by a spring 7, a thermal head 8 is pressed against a platen roller 9. In this state, if the thermal head 8 is made to generate heat according to the image signal and the clamp device 1 is moved in the direction of the arrow 14, the ink in the heated portion is melted and transferred to the paper 2, and printing is performed. .

[0005]

[Problems to be Solved by the Invention] Since the conventional clamp device is constructed as described above, the friction coefficient of the friction plate 6 that clamps the paper 2 is small, and sufficient clamping force cannot be obtained, causing the paper to When dust such as powder adheres, the clamping force decreases more and more, causing the paper 2 to slip and become misaligned.As a result, there is a problem in that printing misalignment and paper jam occur.

[0006] This invention was made to solve the above-mentioned problems, and it is possible to obtain sufficient clamping force.
To provide a paper clamping device for a printer that does not reduce clamping force even if dust such as paper powder is attached and has high reproducibility of paper position.

[0007]

[Means for Solving the Problems] In order to achieve the above object, a paper clamping device for a printer according to the present invention clamps paper on the other end sides of upper and lower clamp members, each of which has one end pivotally connected to the other. In a paper clamping device for a printer, which is provided with a paper pressure contact surface, one of the above paper pressure contact surfaces is formed of an elastic pressing member, and the other paper pressure contact surface is formed of a hard, high friction material, and the above paper pressure contact surface is formed of a hard high friction material. It has a structure that strengthens its power.

[0008]

[Operation] The paper clamping device of the printer according to the present invention is configured as described above, so that the press contact surface formed by a hard high friction material such as ceramic particles and the press contact surface formed by an elastic pressing member are combined. The paper is clamped securely by increasing the contact surface. Further, even if dust such as paper powder adheres to the hard high friction layer, the elastic pressing member absorbs it and the clamping force does not decrease, so that the paper position reproducibility is high.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, numerals 2, 3, and 7 to 13 are equivalent to those of the conventional device explained with reference to FIG. 2, and their explanation will be omitted here. Reference numerals 15 and 17 indicate upper and lower clamp members, and one end of each is pivotally connected to each other by a support shaft 3. A pressure contact surface is formed at the other end of each clamp member, one paper pressure contact surface (in this case, the upper clamp surface) is formed of a hard high friction material 16 formed by fixing ceramic particles, and the other paper pressure contact surface is formed of a hard high friction material 16 formed by fixing ceramic particles. (Here, the lower clamp surface) is formed by an elastic pressing member 18 such as an attached rubber plate or synthetic resin elastomer plate.

Next, the operation of the apparatus according to this embodiment will be explained. First, the upper clamp member 15 is rotated about the support shaft 3 to open the space between it and the lower clamp member 17,
After inserting the paper 2, the door is closed again and the paper 2 is sandwiched between a hard high friction body 16 provided on the upper clamp member 15 and an elastic pressing member 18, and a load is applied to the upper clamp member 15 by the spring 7. The paper 2 is now securely clamped between the upper and lower clamp members 15 and 17. During printing, after the thermal head 8 is pressed against the platen roller 9, the clamp device is moved in the direction of the arrow 19, and the thermal head 8 is made to generate heat according to the image signal, melting the ink on the ink sheet 11 and applying it to the paper 2. It is something to be transcribed. Although a large tension is generated in the paper 2 during this operation, it is reliably clamped by the hard, high friction layer 16 formed of ceramic particles, and no displacement occurs.

Furthermore, since this hard high-friction material 16 is made of particles such as ceramic, the frictional force does not decrease due to the elastic pressing member being press-fitted, and there is no possibility that dirt such as paper powder may be present. The elastic pressing member absorbs this even if the clamping force is applied, so that the frictional force does not decrease and a stable clamping force can be obtained for a long time. Therefore, the paper 2 does not become misaligned, and a high-quality printer with very little misalignment of print can be obtained.

[0012] In the above embodiment, the hard high friction layer 16 is formed of ceramic particles, but it is not limited to this, and may be formed by pasting sandpaper, for example.

Further, in the above embodiment, the upper clamp member 15
Although the pressure contact surface of the lower clamp member 17 is formed of the hard high-friction material 16 and the pressure contact surface of the lower clamp member 17 is formed of the elastic pressing member 18, there is no problem even if they are reversed.

[0014]

As described above, according to the present invention, in a paper clamping device for a printer, one paper pressing surface of the clamping member is formed with a hard high friction material, and the other paper pressing surface is formed with an elastic pressing member. Since the paper is formed with the above-mentioned hard high-friction body, the paper is reliably pressed against the hard high-friction body and held while increasing the contact area.Also, even if paper powder or other foreign matter adheres, it is absorbed by the elastic pressing member. Since the frictional force does not decrease, it is possible to obtain a paper clamping device for a printer in which the paper is less likely to be misaligned during printing.

[Brief explanation of the drawing]

FIG. 1 is a side view showing the configuration of an embodiment of a paper clamp device for a printer according to an embodiment of the present invention.

FIG. 2 is a side view showing the configuration of a paper clamp device of a conventional printer.

[Explanation of symbols]

15 Upper clamp member 16 Hard high friction material 17 Lower clamp member 18 Elastic pressing member

Claims (3)

[Claims] Claim 1: A paper clamping device for a printer, in which a paper pressure contact surface for clamping a paper is provided on the other end side of upper and lower clamp members whose respective ends are pivotally connected to each other; 1. A paper clamping device for a printer, characterized in that the paper clamping device is formed of an elastic pressing member, and the other paper pressing surface is made of a hard, high-friction material to strengthen the paper clamping force. 2. A paper clamp device for a printer according to claim 1, wherein the hard high friction material is a ceramic particle fixing material. 3. The paper clamp device for a printer according to claim 1, wherein the hard high friction material is sandpaper.