JPH072210Y2 - Paper feeder for printer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a paper feeding device of a printer. More specifically, the present invention relates to a paper feeding device for forcibly feeding the recording paper from the supply unit along the path for transferring the recording paper from the supply unit to the drive unit.

[Prior Art] Conventionally, in this type of technology, as shown in the representative example of FIG. 2, a roller-shaped supply roller 13 for reducing the drawing load of the roll-shaped recording paper 1 is arranged on the supply member 2. Further, the tension leaf spring 14 is arranged between the supply member 2 and the paper guides 6 and 7.

However, the paper feed time is shortened as the paper feed speed increases with the recent increase in the printing speed of the printer, and as a result, the inertia load of the load for rotating the roll-shaped recording paper 1 is reduced. However, the desired transfer pitch was not obtained and the feed accuracy deteriorated. In particular, when the outer diameter of the roll-shaped recording paper is large, the defect is remarkable.

As another prior art, as shown in JP-A-60-47551, a roll-shaped recording paper is tensioned by a switch arranged between the roll-shaped recording paper and a platen roller which is a driving unit. Is detected and the roll-shaped recording paper is directly rotated by a dedicated motor to make the recording paper loose.

However, in this conventional technique, a dedicated motor and detector are required, and moreover, the roll-shaped recording paper must be connected to a mechanism that is driven to rotate by the motor, and its structure is complicated and the roll-shaped recording is performed. Paper was difficult to set, and it was very expensive. Furthermore, since the tension arm of the detection member is rotated in a short time, the inertia and the bound of the tension arm lower the paper feeding accuracy.

Further, as another prior art, as shown in Japanese Utility Model Application Laid-Open No. Sho 59-83554, a type in which a paper feeding drive means rotating in synchronization with the drive unit is arranged between the roll-shaped recording paper and the drive unit. There was one.

However, in this conventional technique, since the two driving means sandwich the recording paper and forcibly transfer the recording paper, it is necessary that the transfer amount of the recording paper is exactly the same. It is extremely difficult to make them exactly the same due to the difference in the coefficient of friction. Therefore, the recording paper is pushed between the two driving means to cause a jam, or the recording paper is tensioned by the two driving means and wrinkles are generated on the recording paper to deteriorate the print quality or feed the paper. There was a problem such as a decrease in accuracy.

[Problems to be Solved by the Invention] The present invention has been made to solve such drawbacks, and its purpose is to improve the reliability of paper feeding without paper jam and the accuracy of paper feeding. To provide a paper feeding device for the printer. Another object of the present invention is to provide a paper feeding device which is inexpensive and in which roll recording paper can be easily set.

[Means for Solving the Problems] In order to solve the above problems, the printer paper feeding device of the present invention includes a supply member to which roll-shaped recording paper is wound, and recording paper is set. A drive roller for intermittently or continuously transferring, a paper guide for guiding the recording paper fed from a supply member to the drive roller via a head,
A feeding shaft disposed between the supply member and the paper guide and at a position where the recording paper is curved, rotating at least during the rotation of the drive roller, and rotating at a peripheral speed higher than the transport speed of the recording paper by the drive roller. However, when the recording paper is transported by the drive roller and is tense between the drive roller and the roll-shaped recording paper, the feeding shaft transfers the recording paper by the drive roller due to the frictional force acting between the recording paper and the recording paper. The roll-shaped recording paper is transported at a speed faster than the speed to rotate the roll-shaped recording paper to release the tension of the recording paper between the drive roller and the roll-shaped recording paper, thereby causing the slack to be generated between the drive roller and the roll-shaped recording paper. When there is slack in the recording paper, the feeding shaft has no frictional force with the recording paper and slips, stopping the rotation of the roll-shaped recording paper.

[Embodiment] An embodiment according to the present invention will be described below in detail with reference to FIG.

The roll-shaped recording paper 1 is set on the supply member 2.
Reference numeral 3 is a projection portion which is arranged on the supply member 2 and which contacts the outer peripheral portion of the roll-shaped recording paper 1.

Reference numerals 6 and 7 are paper guides for guiding the recording paper fed from the roll-shaped recording paper 1 to the head 9, and 8 is a platen.

Reference numeral 10 denotes a drive roller which is arranged on the downstream side of the head 1 and drives the recording paper to feed, and 11 denotes a pressing roller which presses the drive roller 10. 4 is disposed between the driving roller 10 and the roll-shaped recording paper 1 set on the supply member 2, and the recording paper comes into contact with the outer peripheral portion at a position where the recording paper fed from the roll-shaped recording paper 1 is curved. Is a delivery shaft that is arranged in such a manner that it rotates in the direction of the arrow when the printer operates. Further, the feeding shaft 4 is rotated so as to transfer the recording paper contacting the outer periphery at a speed higher than the transfer speed of the recording paper by the drive roller 10. 12 is a printer drive source 5
Is a transmission belt that transmits the rotational power of the feeding shaft 4 to the feeding shaft 4 to rotate the feeding shaft 4 while the printer is operating.
Is constantly rotated by the transmission belt 12.

Next, a situation where the recording paper is transported by these mechanisms will be described.

The recording paper fed from the roll-shaped recording paper 1 set on the supply member 2 comes into contact with the outer peripheral portion of the feeding shaft 4, is curved, and is guided by the paper guides 6 and 7, and the platen 8 serving as a printing unit It is attached so that it passes through the head 9 and is further sandwiched by the driving roller 10 and the pressing roller 11.

The recording paper attached as described above is intermittently or continuously transferred by the rotating driving roller 10. When the recording paper is transported by the drive roller 10, the pressing roller 11 presses the drive roller 10 to sandwich the recording paper and the portion peeled off from the roll-shaped recording paper 1 set on the supply member 2. Since the length of the recording paper between the recording paper and the recording paper becomes short and the recording paper is tense, the recording paper is pressed against the curved feeding shaft 4.
When the recording paper comes into pressure contact, a frictional force is generated between the feeding shaft 4 and the recording paper, and the feeding shaft 4 transports the recording paper and rotates the roll-shaped recording paper 1 to unwind the recording paper.

Since the feeding shaft 4 is rotated by the printer power source 5 and the transmission belt 12 at a speed higher than the transfer speed at which the drive roller 10 transfers the recording paper, the recording paper is transferred by a larger amount than the drive roller 10 transfers. It

As a result, the recording sheet between the drive roller 10 and the roll-shaped recording sheet 1 becomes long, tension is released, and slack in the margin is generated. The pressure contact between the recording sheet and the drive roller 10 is released, and the roll-shaped recording sheet is released. The paper 1 is never rotated by the drive roller 10.

Therefore, the driving roller 10 has an inertial load on the recording paper 1 and
The frictional load on the paper guides 6 and 7 can be extremely reduced, and the recording paper 1 can be transported with a small driving force.

[Advantages of the Invention] As described above, according to the present invention, a supply member on which a roll-shaped recording paper is set, in which the recording paper is wound into a roll,
A drive roller for intermittently or continuously transferring the recording paper,
It is arranged between the paper guide that guides the recording paper fed from the supply member to the drive roller via the head, and at a position where the recording paper is curved between the supply member and the paper guide, and it rotates at least during the rotation of the drive roller. When the recording paper is transported by the drive roller and is tense between the drive roller and the roll-shaped recording paper, the delivery shaft has The friction between the recording paper and the recording paper causes the drive roller to transfer the recording paper at a speed higher than the transfer speed of the recording paper to rotate the recording paper, and the recording between the drive roller and the recording paper roll is performed. When the tension of the paper is released to cause slack, and there is slack in the recording paper between the drive roller and the roll-shaped recording paper, the feeding shaft slips without friction with the recording paper,
Since the rotation of the roll-shaped recording paper is stopped, the rotation load of the roll-shaped recording paper with large inertia is not applied to the drive roller, and the movement pitch is stable even if the recording paper is fed in a short time. The paper feeding accuracy is improved, which greatly contributes to the speedup of the printer.

Further, a detector or the like for detecting the slack of the recording paper between the driving roller and the roll-shaped recording paper is not required, and further, a motor for rotating the roll-shaped recording paper and control of the motor are also unnecessary. The mechanism is simple and has only a continuously rotating payout shaft, so the mechanism is highly reliable and inexpensive, and the operability is extremely easy to set the recording paper in the recording paper path. Is excellent.

Furthermore, since the feeding roller does not nip the recording paper, there is no problem that the recording paper is pushed in between the feeding roller and the driving roller to cause a paper jam or a deformation of the recording paper, and there are few failures and reliability is high. Further improved, and
The miniaturization can be achieved.

As described above, the practical effect of the present invention is extremely large.

[Brief description of drawings]

 FIG. 1 is a diagram showing an embodiment of the present invention. FIG. 2 is a diagram showing a conventional embodiment. 1-roll recording paper 2-feeding member 4-feeding shaft 5-power source 6,7-paper guide 10-driving roller 11-pressing roller 12-transmission belt

Claims (1)

[Scope of utility model registration request] 1. A recording paper fed from a supply member is guided to a paper guide via at least a feeding shaft which is rotated,
Further, in a paper feeding device of a printer having a recording paper path which is guided to a paper feeding drive roller via a head, a supply member on which a roll-shaped recording paper is wound, and the recording paper is set. A drive roller for intermittently or continuously transporting paper, a paper guide for guiding the recording paper fed from the supply member to the drive roller via a head, and between the supply member and the paper guide and The recording paper is disposed at a position where the recording paper is curved, has a feeding shaft that rotates at least during rotation of the drive roller, and that rotates at a peripheral speed that is faster than the transport speed of the recording paper by the drive roller, When it is transported by the drive roller and is tense between the drive roller and the roll-shaped recording paper, the feeding shaft is driven by the frictional force acting between the recording paper and the recording paper. The roll-shaped recording paper is rotated at a speed higher than the transfer speed of the recording paper by the drive roller to release the tension of the recording paper between the drive roller and the roll-shaped recording paper. When there is slack in the recording paper between the drive roller and the roll-shaped recording paper, the feeding shaft slips without frictional force with the recording paper, and the rotation of the roll-shaped recording paper is prevented. A paper feeding device for a printer, which is stopped.