JPH0235701Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention selectively feeds sheet paper (paper) stacked and stored in two paper feed stackers above and below the platen of a printer or other printing device. The present invention relates to a paper feed device for a printing device.

[Prior Art] In general, a printing device such as a printer holds a sheet of paper on a platen consisting of a rotating cylinder, and prints on the platen using a printing head such as a thermal printing element, a dot printing element, etc.

A paper feed device including a paper feed stacker for storing a plurality of sheets of paper, a paper ejection stacker for storing a paper feed means and the printed paper, and a paper ejection roller is attached to such a printing device, and the paper is loaded onto the platen. Feeding, discharging and storing devices are widely used.

It has been proposed that the paper feed stacker of this paper feed device is configured with paper stacks arranged in two stages, upper and lower, so that sheets of different sizes can be selectively fed to a platen.

[Purpose of invention]

This idea is based on the idea that if the upper and lower paper stacks of this type are always energized so that the top paper comes into pressure contact with the paper feeding means and feeds the paper reliably, then the paper stack is Although it is necessary to perform an operation to separate it from the paper means, it is possible to facilitate that operation;
The purpose is to simplify its structure.

[Example of idea]

An embodiment of this invention will be described below with reference to the drawings.

<Structure> As shown in FIG. 1, the printing device A includes a platen 1, a head carriage 2 that can reciprocate in the left-right direction along the platen 1, and a print head 3 mounted on the carriage 2. . The head carriage 2 is connected to a stepping motor so as to reciprocate from side to side along a shaft attached to a frame, and is controlled by this motor to step to each printing position.

The platen 1 is composed of a rotating cylinder, which is rotated by a stepping motor (not shown) by a predetermined angle around a rotating shaft 1a, and feeds the paper along with the printing by the reciprocating movement of the head 3. It's summery.

A vinyl roller 4 is pressed around the platen 1.

The paper feed device B includes a paper feed stacker 5, a paper feed means for separating and feeding sheets one by one from the stacker 5, such as a paper feed roller 6 (a belt or the like may be used), a paper discharge stacker 7, and a paper feeder 6 for separating and feeding the sheets from the stacker 5 one by one It consists of a paper ejection roller 8 for ejecting paper, a paper feed path 9 from the paper feed stacker 5 to the platen 1 of the printing device A, a paper ejection path 10 from the platen 1 to the paper ejection stacker 7, and a device frame 11. ing.

Then, the device frame 11 is attached to the printing device A, and the sheets stacked and stored in the sheet feed stacker 5 are fed one by one to the platen 1, and the sheets after printing are stored in the sheet discharge stacker 7.

The paper feed stacker 5 is constructed by placing two paper stacks 51 and 52 side by side in two stages, one above the other, and stores two types of paper of different sizes, so that it can selectively feed paper of the size according to the purpose. There is. 51a, 5
Reference numeral 2a denotes a paper side edge guide of each paper mounting table 51, 52. A paper feeding roller 6 serving as a paper feeding means is disposed above the tip of each paper mounting table 51, 52, and is connected to a drive motor M as shown in FIG.

This drive motor M is composed of a reversible motor capable of forward and reverse rotation, and is connected to the first and second paper feed rollers 6.
are connected so that when one rotates in the paper feeding direction, the other rotates in a direction different from the paper feeding direction. Note that 12 is a reverse gear.

Each paper feed roller 6 is provided with a one-way clutch 61 that allows the roller 6 to rotate only in the paper feeding direction.
It is built in between the support shaft 62 and the support shaft 62.

The paper loading tables 51 and 52 are supported by shafts 53a and 53b at their rear ends on the device frame 11, and levers 54,
It is supported by first and second push-up levers 55, so that the tip end side can swing freely.

And the levers 54 and 55 always have a paper loading table 51,
52 toward the paper feed roller 6 side, for example, springs 56 and 57 are bridged between the device frame 11, and the force of these springs 56 and 57 acts on the levers 54 and 55, and the paper is loaded. stand 51,5
2 is constantly pressed against the paper feed roller 6.

At the same time, the operating lever 13 is engaged with the levers 54 and 55 so as to resist the force of springs 56 and 57 and lower the levers 54 and 55 to the state shown in FIG. 2 when loading paper.

The operating lever 13 is attached to a pin 13 on the device frame 11.
It is rotatably supported by a shaft at C, and its one end protrudes from the device casing so that the user can swing it with his or her fingers, and the other end supports two upper and lower paper loading tables 51,
First and second engaging means, such as pins 13a and 13b, which engage with levers 54 and 55 of 52 are implanted. 14 is a locking lever of the operating lever 13.

Depending on the biasing force of the springs 56, 57 or the structure of the operating lever 13, the operating force of the operating lever 13 may increase and smooth operation may not be possible. By engaging the levers 54 and 55 at different timings, the force of the spring 56 of the paper mounting table 51 and the force of the spring 57 of the paper mounting table 52 acting on the operating lever 13 are divided into forces by shifting the timing. In this way, the operating lever 3 can be operated smoothly.

<Operation> In such a configuration, this device operates as follows.

When the operating lever 13 is moved from the position A to the position B in FIG.
Push down a predetermined amount against the
3b presses down the lever 55 of the lower paper loading table 52 against the spring 57, and with one operation of the operating lever 13, the upper and lower sheet loading tables 51 and 52 are separated from the sheet feeding roller 6 and moved to the sheet replenishing position.

In this state, paper is replenished from the rear end portions of the paper trays 51 and 52.

Next, when the operating lever 13 is set to the state shown in FIG.
are pushed up toward the paper feed roller 6 by springs 56 and 57, and the uppermost paper on the paper trays 51 and 52 is pressed against the paper feed roller 6.

When the drive motor M is rotated counterclockwise in FIG. 5 by the user's paper selection signal, the paper feed roller 6 on the lower side of the figure rotates in the paper feeding direction, and the paper feed roller 6 on the upper side rotates in the paper feeding direction. Although the opposite rotation is transmitted,
The one-way clutch 61 does not transmit the rotation and maintains a stationary state.

When the drive motor M is rotated clockwise, the lower paper feed roller 6 becomes stationary, and the upper paper feed roller 6
only rotates in the paper feeding direction.

Therefore, by rotating the drive motor M in the forward or reverse direction, it is possible to rotate either the upper or lower paper feed roller 6, and the two upper and lower paper loading tables 51, 5 can be rotated.
The paper on the top 2 can be selectively fed out.

The fed paper is caught by the separation claws 58 and 59 shown in FIG.

This paper is printed by a printing device, and is ejected to a paper ejection stacker 7 by a paper ejection roller 8 through a paper ejection path 10.

As explained above, the upper and lower paper loading tables 51,
Pins 13a and 13b provided on a single operating lever 13 that separates each paper mounting table 51 and 52 from the paper feed roller 6 are moved against the urging force of springs 56 and 57 provided on each paper mounting table 52. Since the levers 54 and 55 of the levers 54 and 52 of the levers 52 and 52 are engaged at different timings, the paper trays 51 and 52 arranged in two rows above and below can be simultaneously separated from the paper feed roller 6 by one operation of the operating lever 13. It can be easily set at the replenishment position, and if an operating lever is provided on each of the paper loading tables 51 and 52, it will be troublesome for the user and the user may be confused as to which lever to operate. There is no. Moreover, its structure is simple and can be easily incorporated into a limited space.

Furthermore, during the swinging stroke of the operating lever 13, the engagement pin 13a of the lever 13 first touches the paper tray 5.
The lever 54 of the operating lever 13 is engaged with the lever 54 of the paper table 52 and pushed down, and the engagement pin 13b of the operation lever 13 is engaged with the lever 55 of the paper tray 52 and pushed down with a slight delay from this timing. The drag forces of the two springs 56 and 57 acting on the operating lever 13 cause a time lag as shown in FIG. 4B, and the drag force A of the first spring and the drag force B of the second spring
The resultant force C caused by the overlapping of the two can be made relatively low.

Note that the force acting on the operating lever 13 may be such that a second resistance force B is applied subsequent to the resistance force A of the first spring as shown in FIG. 4A. In addition, if the engagement stroke between the operation lever 13 and the push-up levers 54 and 55 is increased as shown in FIG. It is also possible to make the resultant force C form a smoother curve than that shown in FIG. 4B.

[Effect of idea]

In summary, this invention is a paper feeding device in which paper stacked and stored on a paper loading table is sent out by a paper feeding means, in which the paper loading table is arranged in two stages, upper and lower, and each stage is arranged so as to be able to move toward and away from the paper feeding means. The timing of engagement between the first and second push-up levers that urge each paper stack toward the paper feeding means and the single operation lever that pushes down the push-up levers is determined. Since the first and second push-up levers are shifted toward the sheet feeding means, the drag force of each urging means is dispersed, and the operating lever can be operated relatively smoothly.

[Brief explanation of the drawing]

The drawings show one embodiment of this invention; Fig. 1 is an overall explanatory diagram, Fig. 2 is an explanatory diagram of the state during paper replenishment, Fig. 3 is an explanatory diagram of the main parts, and Fig. 4 is an illustration of the operating lever. FIG. 5 is an explanatory diagram of the drive system. 1...Platen, 3...Print head, 5...Paper feed stacker, 51, 52...Paper mounting table, 13...Operation lever, 56, 57...Spring.

Claims (1)

[Scope of Claim for Utility Model Registration] Paper trays 51 and 52 provided in two upper and lower stages for stacking and storing paper sheets, and paper feeding means 6 and 6 for feeding the sheets on these paper trays 51 and 52 in the paper feeding direction. and the paper feeding means 6, by the urging means 56, 57.
first and second push-up levers 54, 55 which are biased toward the 6 side and push up the paper loading tables 51, 52 toward the paper feed means 6, 6; and the first and second push-up levers. 54,55
, the first and second push-up levers 54 and 55 are pushed down against the urging force of the urging means 56 and 57, and the paper mounting tables 51 and 52 are pushed up against the sheet feeding means 6. , 6 a single operating lever 1
3, which is provided on this operating lever 13 to move the operating lever 13 to the first and second push-up levers 5.
4 and 55 at different timings.