JPH01237172A - Paper feed mechanism - Google Patents

Abstract

PURPOSE:To obtain a simple and low-cost roll paper carriage mechanism by providing a constitution which consists of a paper feed roller with high hardness and a high coefficient of friction, a groove formed, within the width of paper, on a paper feed roller and a transport belt, consisting of an elastic member, arranged on the groove. CONSTITUTION:If the tip of paper 12 is inserted between a transport belt 2 and a holding roller 6, this is detected by a detector to rotate a motor 4 and then a paper feed roller 1. Then rotation of the paper feed roller 1 is transmitted, by friction, to the transport belt 2 arranged on a groove section 1-A, and the transport belt 2 rotates in the same direction at a slightly lower peripheral speed than the paper feed roller 1. Said direction is clockwise and the paper 12 reaches the roller 1, passing through an area under a printing head 7 by the guidance of a paper guide 11. The paper 12 held by the paper feed roller 1 and the paper holding roller 6 is transported precisely by a strong feeding force. After this state, the paper 12 is pressed against a platen 9 by the head 7 via an ink carrier 8 to perform print recording. As the peripheral speed of the transport belt 2 is lower than that of the paper feed roller 1, the slack of the paper 12 is eliminated and transported without generation of paper feed irregularity or clogging with paper.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a paper feeding mechanism used in printers and the like.

[Conventional technology]

Conventionally, paper conveyance in printers and the like has been carried out in a series of steps from paper feeding to printing to paper ejection while controlling the paper feeding speed and paper feeding force of each of a plurality of independent rollers.

[Problem to be solved by the invention]

However, the above-mentioned conventional technology has a complicated mechanism, a large number of parts, and is expensive.

SUMMARY OF THE INVENTION The present invention is intended to solve the above-mentioned problems, and its purpose is to provide a simple and inexpensive roll paper transport mechanism.

(Means for Solving the Problems) In order to solve the above problems, the paper feed roller of the present invention has a paper feed roller exhibiting high hardness and a friction coefficient on the side, and a groove portion formed within the width of the paper on the paper feed roller. , and a conveyor belt made of an elastic member hung in the groove.

[Effect]

In the paper feed mechanism configured as described above, the paper feed roller performs paper transport that requires precision and force, especially during printing, and performs other paper transport, such as paper feeding and ejection operations. A conveyor belt does this.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a structural diagram showing the configuration of an embodiment of the present invention, in which 1 indicates a motor 4.
A paper feed roller 1-A is a groove formed in the center of the paper feed reroller 1, and a rubber conveyor belt 2 is hung in the groove. At this time, the diameter of the groove portion 1-A is set so that the outer peripheral surface of the conveyor belt 2 does not protrude beyond the outer peripheral portion of the paper feed roller 1. 12 is paper.

FIG. 2 is a cross-sectional view showing the configuration of a thermal transfer printer using an embodiment of the present invention, in which 5 is a paper press roller that presses the paper feed roller 1 while escaping the groove 1-A, and 6 is a paper press roller that presses the conveyor belt 2 lightly. 7 is a head that presses the ink carrier 8 against the platen 9 to perform print recording; 10 is a pulley that guides the conveyor belt 2 with a constant tension;
Reference numeral 1 denotes a paper guide that guides the paper 12.

Next, the operation will be explained. In FIG. 2, paper 12
When the leading end of the sheet is inserted between the conveyor belt 2 and the belt holding roller 6, a detector (not shown) detects this, and the motor 4 shown in FIG. 1 rotates, causing the paper feed roller 1 to rotate. The rotation of the paper feed roller 1 is transmitted by friction to the conveyor belt 2 hooked on the groove 1-A, and the conveyor belt 2 rotates in the same direction at a slightly different circumferential speed than the paper feed roller 1. This direction is the second
The rotation is clockwise in the figure, and the paper 12 follows the paper guide 11, passes under the head 7, and reaches the paper feed roller 1.

Paper 12 held by paper feed roller 1 and paper press roller 6
is conveyed with high precision using strong feeding force. After this state is reached, the head 7 presses the paper 12 against the platen 9 via the ink carrier 8, and printing is performed. Since the peripheral speed of the conveyor belt 2 is different from the peripheral speed of the paper feed roller 1, the paper 12
The slack between the H feed roller 1 and the conveyor belt 2 is removed, and the paper is fed without any irregularities or paper jams. Even if more tension than necessary is applied to the paper 12, the pressing force of the belt presser roller 6 is small, so that the paper 12 and the conveyor belt 2 are prevented from slipping and causing an overload.

The above is a series of operations, but the present invention is also effective in the case of a color printer in which printing is performed by reciprocating the paper 12 multiple times and sequentially overlapping ink carriers of different colors. When the recording is completed, the paper 12 is fed backwards. When the paper feed roller 1 rotates counterclockwise in FIG. 2, the conveyor belt 2 also rotates in the same direction to eject the paper 12 from the insertion slot. To prevent paper from accumulating in the printer.

Therefore, it is sufficient to provide a space within the printer that can absorb only the slack due to the difference in the feed speed between the conveyor belt 2 and the paper feed roller 1.

〔Effect of the invention〕

As described above, according to the present invention, a rubber belt can be simply hooked onto the paper feed roller without requiring any other power or special control (paper feed to assist paper conveyance). A further advantage is that the paper path layout can be freely arranged according to the HI by utilizing the variability of the belt.

[Brief explanation of the drawing]

FIG. 1 is a structural diagram showing the configuration of the present invention. FIG. 2 is a sectional view of a printer using the paper feed Ia bridge of the present invention. 1... Paper feed roller 2... Conveyor belt and above Applicant Seiko Epson Co., Ltd. Agent Patent attorney Kizobe Suzuki and 1 other person 2 Feeding belt 12 sheets Tami 8\

Claims (1)

[Claims] It is characterized by being composed of a paper feed roller with high hardness and a large coefficient of friction, a groove formed within the width of the paper on the paper feed roller, and a conveyance belt made of an elastic member hung in the groove. Paper feeding mechanism.