JPH04148959A - Paper feeder - Google Patents

Abstract

PURPOSE:To separate and feed papers to a platen and to control the platen by transmitting the driving force of the platen to a paper separating roll by rotating the platen in a reverse direction several lines, and feeding the paper from the paper separating roll to the platen by rotating the platen in a forward direction. CONSTITUTION:When a platen gear 1 is rotated in a reverse direction (counterclockwise direction) for several lines in responses to a suction order, an engaging lever 11 is moved to the top dead center of a control disk 15. Subsequently, when the platen gear 1 is rotated in a forward direction to suck the paper, the engaging lever 11 is moved to the bottom dead center. In this case, the engaging lever 11 depresses a guide pin 16 which is provided in the dead process (top dead center to bottom dead center) or the control disk 15 and accordingly, the guide pin 16 interlocks with a stopper 17 of an idle gear 6. As a result, the rotary driving force (forward rotation) of the platen gear 1 is transmitted to an idle gear 8 and the paper is fed to a platen 10 by a paper separating roll 9.

Description

[Detailed description of the invention] “Industrial application field” The present invention relates to a paper feeding device such as a terminal device.

[Prior Art] Conventionally, this type of paper feeding device includes a transmission device that rotationally drives a paper separation roll in the opposite direction to the platen for paper movement, and a transmission device that rotates the driving force transmitted to the paper separation roll in the paper separation and feeding direction. The paper feeding device was equipped with a freewheel device that only transmitted the paper.

[Problems to be Solved by the Invention] In order to widely spread paper feeding devices, it was necessary to establish a new and different technology that has the same series of conventional functions.

[Means for Solving the Problems] The present invention is a paper feeding device used in conjunction with a printing device having a platen, which separates cut sheets one by one and feeds the cut sheets to the platen. It has a separation roll and a freewheel device for performing intermittent drive that transmits the driving force of the platen to the paper separation roll and disconnects the driving force after feeding the cut paper, and the freewheel device drives the platen several times. By rotating the line backwards, the driving force is transmitted to the paper separation roll.Next, by rotating the platen forward, the paper can be fed from the paper separation roll to the platen. By rotating the platen in the opposite direction, the drive transmission between the platen and the paper separation roll can be stopped, and the paper feed can be selected by controlling the rotation of the platen.

[Example] Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a longitudinal sectional view of one embodiment of the present invention.

FIGS. 2(a), (b), (c), and (d) are exploded perspective views of the freewheel section. 3 to 6 are diagrams showing the operation of the freewheel.

The rotational driving force of the platen gear 1 is transmitted through the drive transmission device 2,
A control disk 5 and an idle gear 6 are provided on the same axis and engaged with the entraining disk 4 constituting the freewheel 3, and the idle gear 6 is engaged with the idle gear 7. A paper separation roll 9 that feeds the paper to the platen 10 is engaged with an idle gear 8 that is coaxially provided.

A fan-shaped notch 41 is provided on the entraining disk 4, and the engagement lever 11 (entraining mechanism) projects into the notch opening.
A spring 12 is provided so as to face toward the center of the disk. It also has a stopper 13 on the surface that matches the control disc 5.

The control disc 5 is provided with a circular outer peripheral edge 51, a part of which is provided with a guide lever 14, which is designed as a leaf spring. Further, a stopper 15 on a leaf spring is provided on the surface that matches the entraining disk 4, and the drive rotation direction rises to the normal rotation side. Furthermore, a guide pin 16 (carrying mechanism) that can carry the idle gear 6 to the dead process part of the circular outer peripheral edge 52 is a spring.
Second, it is provided in a linear cam shape. The idle gear 6 has a stopper 1 on the surface that matches the control disc 5.
7 is rising.

Next, the operation of this embodiment will be explained.

In the initial state, when the platen gear 1 rotates normally (clockwise), the rotation is transmitted to the driving disk 4 that constitutes the freewheel 3, and is transmitted to the control disk 5 via the stopper 13 provided on the driving disk 4. Ru. The position of the engagement lever 11 on the driver disk 4 is then always at the starting point of the control disk 2.

Next, when the platen gear 1 is reversed several times (counterclockwise) as an inhalation command, the engagement lever 11 moves to the top dead center position of the control disk 5.

Furthermore, when platen gear 1 is rotated forward as suction operation,
The engagement l/bar 11 moves to the bottom dead center position. At that time, the engagement lever 11 presses down the guide pin 16 provided in the dead stroke (from top dead center to bottom dead center) of the control disk 5 and links it to the stopper 17 provided in the idle gear 6, so that the platen gear 1 The rotational driving force (forward rotation) is transmitted to the idle gear 8, and the paper is fed to the platen 10 by the paper separation roll 9.

Next, in order to perform intermittent operation, as a method to release the power, after the paper has been fed to the platen 10, the platen gear 1
By reversing the engagement lever 11 until it overcomes the dead stroke (at the time of reversal, the engagement lever 11 moves toward the guide lever 14
(However, since the guide lever 14 is formed as a leaf spring, it can slide over a part of the lever.) The guide pin 16 at the bottom dead center of the control disk 5 returns to its original position, and the idle gear 6 becomes idle. Platen 1 after that
A rotational driving force of 0 is not transmitted by the paper separation roll 9.

2. As explained step by step, freewheel 3
Establish a specified starting point in normal rotation as the initial state, and then reverse the suction command several lines to move the top dead center of the dead stroke to the position, and then move it to normal rotation as an inhalation operation. The driving force of the platen gear 1 is transmitted to the paper separation roll 9 by moving the platen gear 1 to the bottom dead center position. As a release method, the driving force is released by applying reverse rotation again, and by further rotating the freewheel 3 in the normal direction, the freewheel 3 returns to its initial state, so that the paper is transferred to the platen 10.
It passes through and is discharged.

[Effects of the Invention] As explained above, the present invention not only enables paper separation and paper feeding and control of the platen by extremely simple control of the platen drive unit, but also allows the user to pick up a single sheet of paper from a plurality of paper cassettes. This has the effect of allowing one magazine to be paused to be selected.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of one embodiment of the present invention, FIG. 2 is a perspective view of the freewheel section, and FIGS. 3 to 6 are diagrams showing the operation of FIG. 1. 1...Platen gear, 2...Drive transmission device, 3...
・Freewheel, 4... Entrainment disk, 5... Control disk, 6... Idle gear, 7... Idle gear, 8... Idle gear, 9... Paper separation roll,
10...Platen, 11...Engagement lever, 12...
・Spring, 13... Stopper 14... Guide lever 15... Stopper 16... Guide pin, 1
7... Stopper 1... Fan-shaped notch, 52... Circular outer periphery.

Claims (1)

[Claims] A paper feeding device used in conjunction with a printing device that has a platen, which includes a paper separation roll that separates cut sheets one by one and feeds the cut sheets to the platen, and a paper separation roll that transfers the driving force of the platen to the paper separation roll. The freewheel device has an intermittent drive to transmit the drive force and disconnect the drive force after feeding the cut paper, and the freewheel device reversely rotates the drive of the platen for several lines so that the drive force is transferred to the paper separation roll. Then, by rotating the platen forward, the paper can be fed from the paper separation roll to the platen.After feeding, by rotating the platen in the opposite direction, the platen and paper separation roll are driven. A paper feeding device characterized in that transmission can be stopped and paper feeding can be selected by controlling rotation of a platen.