JPH02307769A - Paper feed mechanism - Google Patents

Abstract

PURPOSE:To remove slack of paper by a method wherein a plate spring is pressed onto the paper with a switching lever. CONSTITUTION:A medium 2 is inserted in a medium insertion direction (a) and is wound around a pin tractor 4 through a printing part 13. When a switching lever 3 moves in a moving direction (b) an arm 11 is moved in a moving direction (c) with a bar 10 and a shaft 5 moves to raise a plate spring 1 coming in contact with the shaft 5 like a pressure part A. When the switching lever 3 moves in a moving direction (d), the arm 11 is moved in a moving direction (e) with the bar 10, and a shaft 5 is moved. Therefore, the shaft 5 loses force for raising the plate spring 1, and the plate spring 1 presses down the medium 2. Further, a pressure roller 6 is moved in a moving direction (f) with a support bar 12 connected to the switching lever 3, and a gap between the pressure roller 6 and a feed roller 7 becomes of a released state.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a paper feeding mechanism, and particularly to a paper feeding mechanism used in a serial printer, in which paper is inserted from the front and the paper is fed by a mounted pin tractor.

[Conventional technology]

In conventional paper feeding mechanisms, when paper is fed from the front of the serial printer and fed by the mounted pin tractor, no pressure is applied to the paper on the feeding side, causing the paper to sag. .

[Problem to be solved by the invention]

However, the above-mentioned conventional paper feeding mechanism has a structure that does not apply any load to the paper on the supply side when the medium is fed by the pin tractor, so there is no load between the pin tractor and the paper supply side. There is a drawback that the printing position is not accurate because the paper sag and this sag is not constant.

[Means to solve the problem]

The paper feeding mechanism of the present invention includes a grooved plate spring that applies pressure to the medium and a switching lever that operates the plate spring when the medium is sent from the front to the rear of the device using a pin tractor installed in a serial printer. , and has a shaft that interlocks with this switching lever.

〔Example〕

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

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, FIG. 2 is an enlarged longitudinal sectional view of the pressure section shown in FIG. 1, and FIG. 3 is an enlarged longitudinal sectional view of the switching section shown in FIG. 1. , FIG. 4 is a vertical cross-sectional view showing the pressurizing state on paper in the embodiment shown in FIG. 1, FIG. 5 is an enlarged vertical cross-sectional view of the pressure applying section shown in FIG. 4, and FIG. FIG. 3 is an enlarged vertical cross-sectional view of the switching section shown in FIG.

In the paper feeding mechanism shown in FIGS. 1 to 6, a plate spring 1 is fixed to a paper guide 9 with a screw 8, and is configured to press a medium 2 against the paper guide 9.

The switching lever 3 is rotatably fixed to the paper guide 9. An arm 11 rotatably fixed to the rotation shaft of the switching lever 3 engages the shaft 5 with the groove of the leaf spring 1 by means of a rod 10.

The pressure roller 6 is constantly pressed against the feed roller 7 by a spring (not shown) and can be separated from the feed roller 7 by a support rod 12 rotatably fixed to the switching lever 3.

Next, the operation of the embodiment shown in FIGS. 1 to 6 will be explained.

Insert the medium 2 in the medium insertion direction a shown in FIG.
3 and wrap it around the pin tractor 4. When the switching lever 3 moves in the moving direction, the arm 11 is moved by the rod 10.
moves in the moving direction C, the shaft 5 moves, and the shaft 5
2. Lift the leaf spring 1 that is in contact with the pressure part A shown in FIG.

The detailed state of the switching section at this time is shown in FIG.

In FIG. 4, when the switching lever 3 moves in the moving direction d, the arm 11 moves in the moving direction e by the rod 10, and the shaft 5 moves, so the shaft 5 loses its force to lift the leaf spring 1, and the leaf spring 1 The medium 2 is pressed like the pressurizing part B shown in FIG.

Further, the pressure roller 6 is moved in the moving direction f by the support rod 12 connected to the switching lever 3, and is in a released state between it and the feed roller 7. The detailed state of the connection portion E at this time is shown in FIG.

〔Effect of the invention〕

The paper feed mechanism of the present invention can eliminate slack in the paper by pressing the plate spring against the paper using the switching lever, and has the effect of improving the accuracy of printing position.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, FIG. 2 is an enlarged longitudinal sectional view of the pressure section shown in FIG. 1, and FIG. 3 is an enlarged longitudinal sectional view of the switching section shown in FIG. 1. , FIG. 4 is a vertical cross-sectional view showing the pressurizing state on the paper in the embodiment shown in FIG. 1, FIG. 5 is an enlarged vertical cross-sectional view of the pressure applying section shown in FIG. 4, and FIG. FIG. 3 is an enlarged vertical cross-sectional view of the switching section shown in FIG. 1...Plate spring, 2...Medium, 3...
...Switching leno (-14...Pin tractor, 5
...shaft, 6 ... pressure roller, 7 ... feed roller, 8 ... screw, 9 ... paper guide, 10 ...・・・・・・
Rod, 11... Arm, 12... Support rod, 13... Printing section, A, B... Pressure section, D, E... ...Switching unit, a...Medium insertion direction, b, c, d, e, f...Movement direction.

Claims (1)

[Claims] It is characterized by comprising a pin tractor for sending the inserted medium, a leaf spring with a groove for applying pressure to the medium, a switching lever for operating the leaf spring, and a shaft interlocking with the switching lever. paper feeding mechanism.