JPH0286471A - Paper feeding mechanism for printer - Google Patents

Abstract

PURPOSE:To feed a continuous form paper without causing any slack and inexpensively by providing a plurality of plate members which make contact with pressure rollers to apply a tension on the paper simultaneously with release of the pressure rollers. CONSTITUTION:At the time of feeding a slip 17, pressure rollers 6 and 7 are pressed against a platen 4 by springs 9 and 10. With the platen 4 rotated through transmission of the rotation of a driving motor 9 by a timing belt, the slip is fed along a paper guide 12 by frictional forces generated between the platen 4 and the pressure rollers 6, 7. At the time of feeding a continuous form paper 18, a lever 8a is turned under attraction by a solenoid 11 to transmit the rotation of the motor to the pressure rollers 6, 7, and the rollers 6, 7 are released from the platen. Simultaneously, the rollers 6, 7 are brought into contact with leaf springs 15, 16, whereby a tension is given to the paper 18, and the paper 18 is fed to a roller 3 without slacking between paper guides 13 and 14.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a paper feeding mechanism of a printing device.

[Conventional technology]

Conventionally, paper feeding mechanisms used in printing devices only use the frictional force between a platen and a pressure roller to feed single sheets, and the pushing force generated by the pin drive of a pin tractor to feed continuous sheets.

FIG. 4 is a side view showing this type of paper feeding mechanism. Continuous paper 18 is passed between inner paper guide 13 and outer vapor guide 14 by pin drive of pin tractor 5, is sandwiched between card holder 2 and platen 4, and is printed by print head 1. Furthermore, the continuous paper 18 is ejected by the frictional force between the platen 4 and the rollers 3. The single sheet 17 passes between the paper guide 12 and the platen 4 and is fed by the frictional force between the pressure roller 6 and the pressure roller 7 and the platen 4. It is not shown in Figure 4 because it is tilted to the side (side).

[Problem to be solved by the invention]

In the conventional paper feeding mechanism described above, as shown in FIG. You have to pass between 14 and 14. With this method, Paper Guide 13
There is a drawback that the continuous paper 18 becomes slack as it passes between the paper guide 14 and the paper guide 14, and the beginning of the continuous paper 18 and the printing position vary.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned drawbacks, and to provide a paper feed mechanism for a printing device that suppresses the sagging of continuous paper and prevents variations in the beginning and printing position of continuous paper.

[Means to solve the problem]

The paper feeding mechanism of the printing device of the present invention is a printing device having a paper feeding mechanism that feeds a continuous sheet by a friction force between a circular platen and a pressure roller, and sends continuous paper by a pushing tractor through a guide section separate from the sheet. A plurality of transmission members connect the pressure roller and the pin tractor to the drive motor at the same time as the pressure roller is released, a lever that releases the pressure roller, and a plurality of transmission members that contact the pressure roller and apply tension at the same time as the pressure roller is released. It has two plate members and a means for moving the lever.

〔Example〕

Next, an embodiment of the present invention will be described with reference to the drawings. 1 to 3 are side views showing one embodiment of the present invention.

FIG. 1 shows the case where a cut sheet 17 is fed, and the pressure rollers 6 and 7 are moved to the platen 4 by springs 9 and 10.
is being forced to. The sheet is sent along the paper guide 12 by the friction between the platen 4 and the pressure rollers 6 and 7 due to the rotation of the platen 4, which is transmitted by the rotation of the drive motor 20 via the timing belt 23.

FIG. 2 shows the case where the continuous paper 18 is fed, and the pressure rollers 6 and 7 are opened by a lever 8a rotated by suction from the solenoid 11. Figure 3 shows continuous paper 1
8, the rotation of the drive motor 20 is transmitted to the pin tractor 5 by the rotation of the lever 8a. At the same time, the rotation of the drive motor 20 is transmitted to the pressure rollers 6 and 7. The surface speed of the pressure rollers 6 and 7 is made slightly higher than the speed of the pin tractor 5. Further, the pressure rollers 6 and 7 are brought into contact with leaf springs (mylar) 15 and 16 at the same time as they are released, and are given tension. When the continuous paper 18 is fed by the pin tractor 5, the continuous paper 18 advances between the paper guides 13 and 14 without slack, and reaches the rollers 13.

〔Effect of the invention〕

As explained above, the present invention includes a plurality of transmission members that connect the pressure roller, a pin tractor, and a drive motor, a lever that opens the pressure roller at the same time as the pressure roller is released, and a lever that opens the pressure roller and simultaneously releases the pressure roller. By having a plurality of plate members that contact the rollers and provide tension, and a means for moving the lever, there is an effect that continuous sheet feeding can be carried out without slack and at low cost.

[Brief explanation of drawings]

Figures 1 to 3 are side views showing one embodiment of the present invention;
The figure is a side view showing a conventional paper feeding mechanism. 1... Print head, 2... Card holder, 3... Roller, 4... Platen, 5... Pin tractor, 6. 7...
Pressure roller, 8a+8b...Lever 9
, 10... Spring, 11... Solenoid, 12... Paper guide, 13...
...Paper guide, 14...Paper guide, 1
5.16...Plate spring (mylar), 17...
... Single sheet, 18 ... Continuous sheet, 20 ...
... Drive motor, 21 ... Motor pulley gear,
22... Platen pulley, 23... Timing belt, 24... Gear, 25...
Pulley gear, 26...pulley, 27...mark gear, 28...group gear, 29...timing belt. Agent: Susumu Uchihara, patent attorney Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] In a printing device having a paper feeding mechanism that feeds a continuous sheet by a friction force between a circular platen and a pressure roller, and sends a continuous sheet by a pushing tractor through a guide part different from the cut guide part, the pressure roller is released. A plurality of transmission members simultaneously connect the pressure roller, the pin tractor, and the drive motor, a lever that releases the pressure roller, and a plurality of transmission members that contact the pressure roller and apply tension at the same time as the pressure roller is released. 1. A paper feeding mechanism for a printing device, comprising: a plate member; and means for moving the lever.