JPH02155677A - Pin tractor device for printer - Google Patents

Abstract

PURPOSE:To bring a printing paper into close contact with a pin wheel and enable levitation of a printing paper to be prevented easily without complicating a construction by bringing an elastic contact part of a tractor door into elastic contact with the pin wheel. CONSTITUTION:A pin tractor device 1 comprises pin wheels 2 each provided with pins 11 protruding radially to be inserted into feed holes 4a of a printing paper 4, and tractor doors 3 covering upper parts of the pins 11. The pin wheel 2 is engaged with and supported by a rotating driving shaft 9, and is rotatably supported on a pin tractor frame 5. The tractor door 3 is openably supported on the frame 5 through a shaft, and is so formed as to cover the upper parts of the pins 11 of the pin wheel 2 when being closed. The tractor door 3 is provided with an extension part 6 which extends to the side of a printing part 8 comprising a printing head 10 of the printer and which faces a paper feeding surface 2a of the pin wheel 2. The extension part 6 is formed of a material such as an elastic plastic, and a tip part thereof is provided as an elastic contact part 7 for making elastic contact with the paper feeding surface 2a of the pin wheel 2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pin tractor device for a printer that feeds paper by a pulling method.

[Prior Art] Conventional pin tractor devices include a pin wheel with radially protruding pins that are inserted into printing paper feed holes, and an openable/closable pin wheel that covers the top of the pin to prevent the paper from slipping off the pin wheel. Some models are equipped with a tractor door. Then, the pinwheel is rotated to send the printing paper on the pinwheel to the printing section.

[Problem B to be Solved by the Invention] By the way, in the conventional printer pin tractor device described above, the tractor door covers the upper part of the pin to prevent the paper from coming off the pin wheel. There is a gap between the paper running surface and the
Therefore, there was a problem in that the printing paper sometimes rose from the pin wheel by the length of the pin, causing the paper to sag. In particular, when the perforations of the printing paper approach the tractor door, the paper becomes more sagging, which significantly deteriorates line feed accuracy during printing.

In order to eliminate these drawbacks, a separate slack removing device is required, for example by applying pack tension to the paper, but this device has the disadvantage of being complex in structure and expensive.

Therefore, an object of the present invention is to
The purpose is to prevent the printing paper from lifting off the pinwheel.

[Means for Solving the Problems] The technical means of the present invention for solving these problems includes a pin wheel having a radially protruding pin inserted into a feed hole of printing paper, and a pin wheel that covers the top of the pin. In a printer tractor device that is equipped with a tractor door that can be opened and closed and that rotates a pinwheel to send printing paper on the pinwheel to a printing section, the tractor door has a mechanism that extends toward the printing section and faces the paper running surface of the pinwheel. The extension part is provided with an elastic contact part that comes into elastic contact with the paper running surface of the pinwheel when the tractor door is closed.

[Embodiment] Hereinafter, a printer pin camel device according to an embodiment of the present invention will be described based on the accompanying drawings. In the printer, a pair of pin camel devices are provided on the left and right sides.

As shown in FIGS. 1 to 3, the pin camel apparatus 1 includes a pin wheel 2 having a radially projecting pin 11 inserted into a feed hole 4a of a printing paper 4, and a tractor door 3 that covers the upper part of the pin 11. It is equipped with The pinwheel 2 is engaged with and supported by a rotary drive shaft 9, and is rotatably held by the pindler frame 5.

Further, the tractor door 3 is pivotally supported by the pin driver frame 5 so as to be openable and closable, and is formed so as to cover the upper part of the pin 11 of the pin wheel 2 when the tractor door 3 is closed. Furthermore, the tractor door 3
An extension portion 6 is provided extending toward the print unit 8 side of the printer where the print head 10 is located and facing the paper running surface 2a of the pinwheel 2. The extension portion 6 is made of a material such as elastic plastic, and its tip end is configured as an elastic contact portion 7 that comes into elastic contact with the paper running surface 2a of the pinwheel 2 when the tractor door 3 is closed. ing. The elastic contact portion 7 is curved to correspond to the curvature of the paper running surface 2a of the pinwheel 2.

Therefore, the printer pin camel device 1 according to the embodiment has the following effects.

First, when installing the printing paper 4 on the pinwheel 2, as shown in FIGS. through the paper running surface 2 of the pinwheel 2.
a to the printing section 8.

Thereafter, as shown in FIGS. 3(a) and 3(b), the tractor door 3 is closed. In this state, the tractor door 3 covers the upper part of the pin 11 of the pin wheel 2, and the extension part 6
The elastic contact portion 7 comes into elastic contact with the paper running surface 2a of the pinwheel 2 via the printing paper 4.

In this state, when the printer performs a printing operation, the pin wheel 2 of the pin tractor 1 is rotated in the direction of the arrow A in the figure by the rotary drive shaft 9, and the printing paper 4 is hooked on the pin 11, and the pin wheel 2 of the pin tractor 1 is rotated in the direction of arrow A in the figure. Send it to 8. At this time, the print head 10 prints on the sent print paper 4. in this case,
The tractor door 3 has a paper running surface 2a on the side closer to the printing section 8.
The elastic contact part 7 of the extension part 6 pushes the printing paper 4 against the paper running surface 2a of the pinwheel 2 by the elastic force when the tractor door 3 is closed.
Since the printing paper 4 is brought into pressure contact with the paper running surface 2a, the printing paper 4 comes into close contact with the paper running surface 2a. Therefore, the printing paper 4 will not be lifted up by the length of the pin 11 due to vibration or the like during feeding, and the printing paper 4 will not sag. As a result, the printing paper 4 is delivered to the printing section 8 in a correct posture. In particular, since the elastic contact section 7 is in elastic contact near the printing section 8, it is possible to reliably suppress the movement of the printing paper 4 due to printing vibrations, etc., and it is possible to print on a more accurate paper position. becomes.

[Effects of the Invention] As explained above, according to the printer pin tractor device of the present invention, the printing paper can be brought into close contact with the pin wheel by bringing the elastic contact portion of the tractor door into elastic contact with the pin wheel. It is possible to easily prevent printing paper from lifting up without complicating the structure. Therefore, printing paper with the correct orientation can be sent to the printing section.
This has the effect of improving the line feed accuracy of printing paper compared to conventional pin tractor devices.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the configuration of a pin tractor device of a printer according to an embodiment of the present invention, FIG.
FIG. 3(b) is a side view of the machine, FIG. 3(a) is a front view showing the printer in poor condition with the tractor door closed and the printing paper brought into close contact with the pinwheel, and FIG. 3(b) is a side view of the machine. 1: Pin tractor 2: Pin wheel 2a: Paper running surface 3: Tractor door 4: Printing paper 5: Pin tractor frame 6: Extension part 7: Elastic contact part 8: Printing part 9: Rotation drive shaft 10: Print head

Claims (1)

[Claims] Equipped with a pinwheel with radially protruding pins that are inserted into printing paper feed holes, and a tractor door that can be opened and closed to cover the top of the pin.The printing paper on the pinwheel is sent to the printing section by rotating the pinwheel. In a pin tractor device for a printer, the tractor door has an extension extending toward the printing section and facing the paper running surface of the pinwheel. A pin tractor device for a printer, characterized in that a pin tractor device is provided with an elastic contact portion that makes elastic contact with the printer.