JPH0140685Y2 - - Google Patents

Description

[Detailed description of the invention] (1) Technical field of the invention This invention relates to a device for supplying sheet paper to a printing device of an information processing device, and in particular, a hopper for stacking and loading the supplied paper, and a hopper for stacking and stacking the supplied paper. Generally, a sheet feeder is equipped with a pick crawler that rotates in contact with the paper above and separates it one by one and feeds it to the printing section, a stacker that stores the printed paper, and a stack crawler that transports the paper from the printing section to the stacker. It concerns a device called.

(2) Prior Art and Problems Figure 1 is a side view showing a conventional sheet feeder, in which 1 is a hopper, 2 is a supply paper stacked on the hopper 1, 3 is a pick roller that rotates in contact with the supply paper 2, and 4 is a side view showing a conventional sheet feeder. 1 is a platen, 5 is a printing head, 6 is a printing unit, 7 is a paper guide that guides the supplied paper sent out by the pick roller 3 to the printing unit 6, 8 and 9 are pressure rollers that rotate in contact with the platen 4, and 10 is a printing process. A stacker 11 is a stacker for storing subsequent sheets, a stack roller 11 is made up of a driven roller 11a and a driving roller 11b, and 12 and 13 are guide plates for guiding sheets discharged from the printing section 6 to the stack roller 11. The paper 2 is fed toward the platen 4 by the frictional driving force of the pick roller 3, is held between the presser roller 8 and the platen 4, is led to the printing section 6 by the paper guide 7, and is then conveyed to the printing section 6 by the presser roller 9 and the platen 4. After being held in place, the printing process is performed. The printed paper is then conveyed while being held by the stack rollers 11, and is dropped into the stacker 10 and stored therein. After the paper sent out by the pick roller 3 is clamped between the platen 4 and the presser roller 8, the paper is fed by the rotation of the platen 4. To avoid paper skew or paper jams caused by speed differences, the paper should be placed on the platen 4.
After being clamped by the pressure roller 8, the driving force of the pitch roller 3 is released by the electromagnetic clutch,
The pick roller 3 is separated from the paper 2 to release its driving force. Generally, the pick roller 3 and the stack roller 11 are driven by the rotation of the platen 4, and in the one shown in the first figure, pulleys 14, 15, and 16 are attached to the platen 4, the pick roller 3, and the stack roller 11, respectively. timing belt 1 between the pulleys of
7 is wound to drive the pick roller 3 and the stack roller 11, and an electromagnetic clutch 18 is interposed between the pick roller 3 and the pulley 15 attached thereto, and the electromagnetic clutch is disengaged to drive the pick roller 3 and the stack roller 11. The driving force is being released.

However, in such a conventional device, the pick roller 3, which is required only when paper is fed, and the stack roller 11, which is necessary only when paper is ejected, are provided as separate and independent devices, which is uneconomical, and the driving force of the pick roller 3 is not used. The electromagnetic clutch 18 is required for release, making the device expensive. In addition, if a structure is adopted in which the pick roller 3 is separated from the paper 2 in order to release the driving force of the pick roller 3, the distance between the pulleys 14, 15, and 16 changes, so the drive force transmission system to the pick roller 3 changes. The problem arises that things become more complicated.

(3) Purpose of the invention This invention employs a structure that separates the pick roller from the paper surface to release its driving force, and uses the separated pick roller as a driving roller for the stack roller.
Drive roller 1 of a stacked roller in a conventional structure
By omitting 1b, it is possible to provide a sheet feeder having the same functions as conventional devices at a lower cost.

(4) Structure of the invention The sheet feeder of this invention consists of a pick crawler that rotates in contact with printing paper stacked on a hopper and separates and supplies the printing paper to the printing section, and a pick crawler that pinches and feeds the paper discharged from the printing section. In a sheet feeder of a printing device that has a stack roller that transports the paper to the stacker, the pick roller is provided so as to be able to come into contact with and separate from the surface of the supplied paper, and a driven roller is provided at a fixed position on the back of the pick roller. When separated, the separated pick roller and the driven roller come into contact with each other, so that a stacked roller is formed by these two rollers.

(5) Example of the invention Figure 2 shows an example of the invention.
Components having the same functions as in FIG. 1 are given the same reference numerals as in FIG. 1. 19 is the axis 2 of the platen 4
The pick roller 21 is pivoted to the tip of this arm 19. Then, the pick roller 21 is brought into contact with the paper 2 at the position shown by the solid line in the figure to feed the paper 2, and the arm 19 is rotated around the platen shaft 20 to separate the pick roller 21 from the paper 2 and provide its driving force. When releasing the arm 19, the arm 19 is rotated to the position shown by the imaginary line in the figure, and the pick roller 21 is brought into contact with the driven roller 11a provided at a fixed position, so that the stack roller 11 is formed by the pick roller 21 and the driven roller 11a. We will make sure that it is done. Although not shown in Fig. 2, the Pitcrawler 21
Since the distance between the axis and the platen 4 remains unchanged regardless of the position of the pick crawler 21, it is easily possible to drive the pick crawler 21 in conjunction with the platen 4, and by using a solenoid etc. It is also possible to rotate the arm 19 depending on the structure.

In the above configuration, the paper 2 is fed by the pick roller 21 at the position indicated by the solid line in FIG. The printed paper is brought into contact with the pick roller 21 and the driven roller 1.
The paper 2 is fed and ejected by repeating the operation of holding the paper 2 between the rollers 1a and 1a and transporting the paper to the stacker 10, dropping the paper into the stacker 10, and then bringing the pick roller 21 into contact with the paper 2 again. can be set. At this time, Pitcrawler 2
1 may rotate together with the platen 4, there is no need to interpose an electromagnetic clutch or the like in the rotation transmission system of the pick roller 21.

(6) Effects of the invention As explained above, in the sheet feeder of this invention, in order to release the driving force after paper is fed, a pick roller that is separated from the paper surface comes into contact with a driven roller that is installed at a fixed position on the back of the pick roller. By doing so, a stud crawler is formed by the pit crawler and the driven roller, so the drive roller of the stud crawler and the rotation transmission system to the drive roller, which were required in the past, are no longer required, and the pit crawler can be moved to the pit crawler. Since the transmission of the rotational force and the release of the paper driving force can be performed with a simple structure, there is an effect that the sheet feeder can be provided at a lower cost than conventional devices.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an example of a conventional sheet feeder, and FIG. 2 is a side view showing an embodiment of the present invention. In the figure, 1 is a hopper, 2 is a supply paper, 6 is a printing section, 10 is a stacker, 11 is a stack crawler, 1
1a is a driven roller, 19 is an arm, 20 is a platen shaft, and 21 is a pick roller.

Claims (1)

[Scope of utility model registration request] A printing device having a pick crawler that rotates in contact with printing paper stacked on a hopper and separates and supplies it to a printing section, and a stack crawler that pinches paper discharged from the printing section and conveys it to a stacker. In the sheet feeder, a pick roller is provided so as to be able to come into contact with and separate from the surface of the supplied paper, and a driven roller is provided at a fixed position behind the pick roller, and when the pick roller is separated from the paper surface, the separated pick roller and the driven roller are disposed. A sheet feeder characterized in that the two rollers are in contact with each other and a stacked roller is formed by the two rollers.