JPH02252569A - Sheet feeding mechanism for printer - Google Patents

Abstract

PURPOSE:To position a continuously printing sheet of any width at the center of a printing area by movably providing tractors along a holder and a drive shaft, securing one tractor to a sheet feeding direction side position of a timing belt, and securing other tractor to an opposite side position. CONSTITUTION:Tractors 2, 3 are movable along a holder shaft 9 and a drive shaft 8. A timing belt 1 is extended at a pair of pulleys 7 to be fed in a direction perpendicular to a sheet feeding direction (direction of an arrow 6). The tractor 2 of left side is secured to the sheet feeding direction side position of the belt 1, and the tractor 3 of right side is secured to the opposite side position to the sheet feeding direction of the belt 1. Accordingly, when the tractor 2 is moved in a direction of an arrow (a), the belt 1 is rotted toward an arrow (c), and the tractor 3 is moved at an equal distance toward an arrow (b). That is, the tractors 2, 3 are extended at the equal distance from the central position 5 of a printing area.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a paper feeding mechanism for a printer, and more particularly to a paper feeding mechanism for a printer that aligns the center of continuous printing paper with the center reference of a print area at any time.

[Prior Art] Conventionally, the paper delivery mechanism of this type of printer has been equipped with a pair of left and right tractors rotatably supported by a holder shaft and a drive shaft in the paper feeding direction. When changing to a continuous printing paper with a width different from that of the paper, it is necessary to align the center position of the continuous printing paper with the center of the left side of the print area. I was doing positioning.

[Problems to be Solved by the Invention] Regarding the paper feeding mechanism of the conventional printer mentioned above,
When changing continuous printing paper of a specified width to continuous printing paper of a different width, adjust the position by moving the tractor left and right using only a rough guide so that the center of the print area matches the center position of the continuous printing paper. Therefore, there is a drawback that it is difficult and time-consuming to accurately align the center positions.

[Means for Solving the Problems] The present invention has been made to solve the above-mentioned problems, and as a means for solving the problems, the present invention provides right and left In a paper feeding mechanism of a printer including a pair of tractors, each of the tractors is provided so as to be movable along the holder shaft and the drive shaft, and a timing belt is stretched so as to be able to feed the paper in a direction perpendicular to the paper feeding direction. , one of the tractors is fixed to a portion of the timing belt on the paper feeding direction side, and the other tractor is fixed to a portion of the timing belt on the opposite side to the paper feeding direction.

[Example] Next, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a plan view showing a paper feeding mechanism of a printer according to an embodiment of the present invention.

In the figure, reference numeral 4 denotes a print head, which is movable along a guide shaft 10. The continuous print paper printed by this print head 4 is sent out by a paper feeding mechanism 11.

The paper feeding mechanism 11 includes a pair of left and right tractors 2.3 and a timing belt 1.

The left and right pair of tractors 2 and 3 are supported by a holder shaft 9 and a drive shaft 8.

The holder shaft 9 and the drive shaft 8 are arranged parallel to each other, and the rotation of the drive shaft 8 allows the tractor 2.3 to rotate in the paper transport direction (in the direction of arrow 6).

Moreover, each tractor 2.3 can move in the left-right direction along the holder shaft 9 and the drive shaft 8.

The timing belt 1 includes a pair of pulleys 7 arranged at both ends of a holder shaft 9 and a drive shaft 8.
The timing belt 1 is made perpendicular to the paper feeding direction (direction of arrow 6).

Then, the left tractor 2 is fixed with a screw to a portion of the timing belt 1 on the paper feeding direction side, and the right tractor 3 is fixed with a screw to a portion of the timing belt 1 on the opposite side of the paper feeding direction. There is.

Therefore, when the left tractor 2 is moved in the direction of arrow a, the timing belt 1 rotates in the direction of arrow C (counterclockwise), and the right tractor 3 moves an equal distance in the direction of arrow A. That is, the left tractor 2 and the right tractor 3 spread out by an equal distance from the print area center position 5.

[Effects of the Invention] As explained above, the paper transport mechanism of the printer of the present invention includes a pair of left and right tractors rotatably supported by a holder shaft and a drive shaft in the paper transport direction. Each of the tractors is provided so as to be movable along the holder shaft and the drive shaft, and a timing belt is stretched so as to be able to feed the paper in a direction perpendicular to the paper feeding direction. - one tractor is fixed, and the other tractor is fixed to the part of the timing belt on the opposite side of the paper feeding direction, so that continuous printing paper of any paper width can be easily positioned at the center of the print area at all times. It has the effect of being able to

[Brief explanation of drawings]

FIG. 1 is a plan view showing a paper feeding mechanism of a printer according to an embodiment of the present invention. 1: Timing belt 2.3 + tractor 5 niblint rear position 6: Printing direction 8 nib drive shaft 9: Holder shaft

Claims (1)

[Claims] In a paper transport mechanism of a printer including a pair of left and right tractors rotatably supported by a holder shaft and a drive shaft in the paper transport direction, each of the tractors is provided movably along the holder shaft and the drive shaft, and the paper A timing belt is stretched so as to be able to feed in a direction perpendicular to the paper feeding direction, one of the tractors is fixed to a portion of the timing belt on the paper feeding direction side, and the other tractor is fixed to a portion of the timing belt on the opposite side of the paper feeding direction. A paper feeding mechanism for a printer characterized by having a fixed tractor.