JPH047979Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a paper feeding device that feeds printing paper to a printing position on a cylindrical platen.

[Prior Art] Conventionally, this type of paper feeding device sends printing paper to a printing position on a platen using a paper feeding device.
There is a pressure contact type in which only the platen is rotationally driven and a paper feed roller is pressed against it, and a control drive in which the platen is rotationally driven and a paper presser roller that is in pressure contact with it is also continuously rotated in synchronization with the rotation of the platen. According to this method, the printed paper is pulled out from the printing position.

Moreover, in the case of both of the above methods, if the paper becomes loose on the platen, clear and accurate printing will not be possible. The paper was placed under tension on the platen.

[Problems to be Solved by the Invention] The conventional paper feeding device configured as described above uses either a pressure contact type or a forced drive type to pull out the printing paper from the printing position. However, with the pressure bonding method, thin paper or stacked paper with a temporary binding part punched out on both sides can be pulled out smoothly, but label paper with labels attached to a backing paper with adhesive or paper with glued parts on both sides can be pulled out smoothly. Cardboard paper with perforations, such as stacked paper, becomes loose at the perforations, making it impossible to maintain the tension of the paper. In addition, with the forced drive type, the above-mentioned label paper and stacked paper with a glued part can be fed smoothly, but thin paper and stacked paper with a temporary binding part can be fed smoothly because the feed hole may be torn or the stacked papers may be misaligned. I can't withdraw it.

Therefore, it is not possible to accurately and smoothly feed various types of printing paper using only one method.

[Purpose of the invention] This invention was made to solve the problems of conventional printing devices.It can be switched between a pressure contact type and a forced drive type with a simple operation, and can feed various types of printing paper. The purpose of the present invention is to provide a paper feeding device that can.

[Means for Solving the Problems] In order to solve the problems of conventional paper feeding devices, the present invention provides a drive wheel that rotates with the rotation of a platen on which printing paper is mounted, and a paper that is pressed into contact with the platen. A driven wheel is provided which is connected to the presser roller and engages with the drive wheel to rotate the paper presser roller as the platen rotates. It is mounted so that it can be moved relative to the position where it does not match.

[Function] With the above-mentioned configuration, the present invention allows at least one of the driving wheel and the driven wheel to be moved relative to the other to a position where it does not engage with the other, the paper feed roller is only pressed against the platen, and only the platen is rotated. The printer is driven to pull out the printing paper from the printing paper position. When at least one of the drive wheel or the driven wheel is moved relative to the other to a position where it engages with the other, the platen is rotationally driven, and the paper presser roller that is in pressure contact with the platen is also continuously rotated in synchronization with the rotation of the platen. and then pull out the printing paper from the printing position.

[Embodiment] An embodiment embodying the present invention will be described below with reference to FIGS. 1 to 3.

A drive shaft 12 (Fig. 3) is rotatably driven by a motor (not shown) on the frame 11 of the platen.
is installed horizontally, and a pair of left and right pin tractors 14 are supported on this drive shaft 12 as a paper feeding mechanism. This pin tractor 14 includes a pair of front and rear toothed pulleys 15, 16, and the toothed pulley 15,
It has a toothed belt 17 suspended between 16 and 16,
Pins 17a are arranged in rows on the outer peripheral surface of the toothed belt 17 at equal intervals. This pin 17a
are adapted to engage with feed holes Pa provided at equal intervals on both sides of the printing paper P. As shown in FIG. 3, the drive shaft 12 is aligned with the arrow A.
When the belt 17 is rotated in the direction shown in FIG. A fixed amount is sent to

A cylindrical platen 20 is supported by a support shaft 21 on the left side of the pin tractor 14 in FIG. This platen 20 is rotationally driven in the direction of arrow C by the motor (not shown) in synchronization with the rotation of the pin tractor 14 so as to have a circumferential speed slightly faster than the paper feeding speed of the pin tractor 14. The printing paper P is guided along the circumferential surface of the platen 20 toward the upper front part. Further, as shown in FIGS. 1 and 2, a platen gear 2 is attached to the left and right support shafts 21 of the platen 20.
2 is provided, and rotates integrally with the rotation of the platen 20.

A guide plate 23 is arranged below the platen 20 at a predetermined interval, and guides the printing paper P sent out from the pin tractor 14 to the circumferential surface of the platen 20.
It is designed to guide the printer to the printing position so that it does not come off the peripheral surface of the printer.

A printing head 26 is placed on a carriage 25 that slides left and right along the axial direction of the platen 20, and is placed opposite to the printing paper P mounted on the platen 20.

Rotating arms 30 are rotatably attached to the lower ends of the left and right frames 11, respectively, and a support shaft 31 is rotatably supported between the upper ends of the rotating arms 31. A plurality of paper pressing rollers 32 are attached to the support shaft 31 at predetermined intervals.
1 and is supported so as to be movable in the axial direction. A roller gear 33 is provided on the right side of the support shaft 31 in FIG. 1 so as to be rotatable together with the support shaft 31 and movable in the axial direction thereof. This roller gear 33 is moved toward the left side of the figure by the flange 33.
The support shaft 31 is composed of a gear 33b having a diameter of 1.a, and the amount of movement to the left is regulated by the protrusion 31a of the support shaft 31. By engaging the roller gear 33 and the platen gear 22, the paper pressing roller 32 rotates as the platen 20 rotates.

Further, due to the spring 34 installed between the rotating arm 30 and the frame 11, the rotating arm 30 is always rotated by the arrow D
biased in the direction. As a result, the paper pressing roller 32 is always pressed against the platen 20.

The operation of this embodiment configured as above will be explained.

The printing paper P is sent out by the pin tractor 14 and guided by the guide plate 23 along the circumferential surface of the platen 20 to a printing position. Then, the operator rotates the rotating arm 30 in the opposite direction of arrow D in FIG. 2 to release the paper pressing roller 32 from the platen 20. here,
If the printing paper P needs to be fed by forced drive, such as label paper or stacked paper with a glued part, the roller gear 33 is connected so that its flange 33a is connected to the support shaft 3.
It is moved to the left position shown by the solid line in FIGS. 1 and 2 until it abuts the protrusion 31a of FIG. Then, based on the biasing force of the spring 34, the paper presser roller 3
The rotating arm 30 is rotated in the direction of arrow D in FIG. 2 until the rotating arm 2 contacts the platen 20 with the printing paper P in between. As a result, the gear portion 33 of the roller gear 33
b engages with the platen gear 22. Then, when the printing operation is performed and the paper is fed, the platen 20
When the pin tractor 14 rotates, the paper feed roller also rotates, and the printing paper P is pulled out from the printing position at a speed slightly faster than the paper feeding speed of the pin tractor 14. At this time,
The printing paper P is smoothly fed without slackening.

In addition, if the printing paper P needs to be fed by pressure contact, such as thin paper or stacked paper with temporary binding, the operator should rotate the rotating arm 30 in the opposite direction of arrow D in FIG. , press the paper presser roller 32 onto the platen 20
Separate from. After that, the roller gear 33 is
Move it to the right side of the figure to the position shown by the chain line in FIGS. 1 and 2. In this position, the roller gear 33
Even if the rotating arm 30 rotates in the direction of arrow D in FIG. 2 and the paper pressing roller 32 contacts the platen 20, it does not engage with the platen gear 22. Therefore, even when a printing operation is performed and the platen 20 is rotationally driven, the paper feed roller 32 is not forced to rotate, and only presses the paper so that the printing paper P does not separate from the circumferential surface of the platen 20. . Therefore, thin paper or stacked sheets with temporary binding can be smoothly pulled out from the printing position without tearing the feed hole Pa or causing the stacked sheets to shift.

In the above embodiment, the platen gear 22 is fixed to the support shaft 21, and the roller gear 33 is provided on the support shaft 31 so as to be movable between a position in which it engages with the platen gear 22 and a position in which it does not engage. The platen gear 22 may be fixed to the support shaft 31 and movably provided on the support shaft 21 between a position where it engages with the roller gear 33 and a position where it does not engage with the roller gear 33. Further, the platen gear 22 and the roller gear 33 may be movably supported by the support shaft 21 and the support shaft 31, respectively.

Note that the rotational drive gears for the platen gear 22 and the platen 20 may be completely different, but they may also be configured by a common rotational drive gear.

[Effects] With the above configuration, the paper feeding device of the present invention can feed paper by simply moving at least one of the driving wheel or the driven wheel to an engaged position or a non-engaging position relative to the other depending on the printing paper to be used. The presser roller can be switched between a pressure contact type and a rotary drive type, and various types of printing paper can be fed smoothly and accurately.

[Brief explanation of drawings]

1 to 3 show an embodiment embodying the present invention, and FIG. 1 is a schematic diagram of a paper feeding device, and FIG.
The figure is a partially enlarged perspective view, and Figure 3 is 3 in Figure 1.
- It is a sectional view taken along line 3. In the figure, 20 is a platen, 22 is a platen gear (driving wheel), 32 is a paper press roller, 33 is a roller gear (driven wheel), 34 is a spring (biasing member), and P is printing paper.

Claims (1)

[Claims for Utility Model Registration] In a paper feeding device that feeds printing paper while holding it between a platen 20 and a paper pressing roller 32 that is pressed against the platen 20 by the action of a biasing member 34, the rotation of the platen 20 a driven wheel 22 that rotates as the platen 20 rotates; and a driven wheel 33 that is connected to the paper press roller 32, engages with the drive wheel 22, and rotates the paper press roller 32 as the platen 20 rotates; 22. A paper feeding device characterized in that at least one of the driven wheels 33 is provided movably between an engaged position and a non-engaged position with respect to the other.