JPS6229238B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printing paper insertion device in a printing device, and an object of the present invention is to obtain a printing paper insertion device that can stably convey printing paper. .

The present invention provides a registration pawl that is connected to a registration pawl advancement/retraction mechanism to receive the leading edge of the printing paper so as to advance or retreat into an entrance path of the printing paper inserted with respect to the platen, and a feed roller so as to come into contact with or move away from the platen. a feed roller connected to a contact/separation mechanism to press the printing paper received by the resist claw against the platen;
An auxiliary roller made of a soft material and having an outer diameter larger than the outer diameter of the feed roller is provided coaxially with the feed roller, and the auxiliary roller moves from the platen of the feed roller while maintaining contact with the platen. The present invention is characterized in that a rotating means for rotating the auxiliary roller when the auxiliary roller is separated is provided. Therefore,
Before the feed roller starts driving, the recording paper is fed by an auxiliary roller driven by a rotating means, and the position of the recording paper is corrected by a registration claw, thereby increasing the accuracy of feeding the recording paper. be.

An embodiment of the present invention will be described based on the drawings.
First, reference numeral 6 denotes a platen rotated by a motor (not shown), and a guide plate 8 is provided along the outer periphery of the platen 6 to guide the printing paper 7. In the vicinity of the platen 6, there is a resist claw 10 having a claw portion 9 that can extend into the entry path of the printing paper 7 and come into contact with the platen 6 so as to receive the leading edge of the printing paper 7 inserted manually.
is provided. This resist claw 10 has its upper end fixed to a shaft 11, and the resist claw 1 is connected to this shaft 11 via this shaft 11.
a registration pawl advancing/retracting mechanism 1 for rotationally displacing the 0 to advance or retreat with respect to the approach path of the printing paper 7;
2 are connected. That is, this registration pawl advancing/retracting mechanism 12 includes a lever 13 whose one end is fixed to the shaft 11, a spring 14 that urges the lever 13 to rotate upward, and a lever 13 that rotates downward against the spring 14. It consists of a solenoid 15 that can be operated.

Further, a feed roller 16 is provided in front of the registration claw 10 and facing the platen 6. This feed roller 16
A shaft 17 fixed to the arm 18 is rotatably supported at one end of the arm 18. Here, this arm 18
A feed roller 19 similar to the feed roller 16 is rotatably supported on the other end side, and the center portion of this arm 18 is a feed roller that brings the feed rollers 16, 19 into contact with or away from the platen 6 via this arm 18. It is connected to the contact/separation mechanism 20. That is, this feed roller contact/separation mechanism 20 includes a lever 23 that is fixed to a shaft 21 that is loosely fitted to the center of the arm 18 and is rotatable about a shaft 22 at the other end, and a lever 23 that lifts the lever 23. A spring 24 biases this lever 23 so that it can be rotated, and a spring 24 biases this lever 23 so that it can be rotated.
4, and a solenoid 25 that can be rotated downward against the rotation of the solenoid 25. Further, a stopper pin 26 is provided at the lower part of the arm 18 so as to be located closer to the feed roller 19 than the shaft 21 .

Therefore, the feed roller 1 is placed on the shaft 17.
As shown in FIG. 2, a plurality of auxiliary rollers 27 are fixedly positioned between the rollers 6 and 6. The auxiliary roller 27 has an outer diameter larger than the outer diameter of the feed roller 16 and is made of a soft material, such as rubber with low hardness, various packaging materials, or fibers such as cloth. Further, a gear 28 is fixed to one end side of the shaft 17, and a gear 29 is provided which serves as a rotation means which is engaged with the gear 28 when the feed roller 16 is separated from the platen 6, while being spaced apart from and facing the gear 28. ing. A shaft 30 of this gear 29 is connected to a motor (not shown).

In such a configuration, when the printing paper 7 is manually inserted from the upper side, the solenoid 15 is turned on and the lever 13 is rotated downward, that is, the shaft 1
1 clockwise, the resist claw 10
is also rotated clockwise to bring the claw portion 9 at its tip into contact with the platen 6 to a position where it prevents the printing paper 7 from entering. On the other hand, in parallel with this operation, the solenoid 25 is also turned on to rotate the lever 23 downward, causing the feed rollers 16 and 19 to move away from the platen 6 via the arm 18 connected to the lever 23. In addition, these solenoids 15 and 25
The ON operation may be performed by a signal from a detection element such as a photo sensor that detects insertion of the printing paper 7, or by switching by button operation by the operator.

In this way, when the feed rollers 16 and 19 separate from the platen 6, part of the arm 18 comes into contact with the stopper pin 26, causing the feed roller 16 to rotate clockwise and the gear 28 to mesh with the gear 29. I will do it. Therefore, the gear 29 is rotated by the motor via the shaft 30, and the auxiliary roller 27 is rotated via the gear 28 in the direction in which the printing paper 7 is fed. At this time, the inserted printing paper 7 is at a position where it hits the auxiliary roller 27, and the outer peripheral surface of the auxiliary roller 27 is in contact with the platen 6. Therefore, due to the rotation of this auxiliary roller 27, the printing paper 7 receives a force in the advancing direction and enters, and its tip touches the resist claw 1.
It hits the claw part 9 of 0. Here, auxiliary roller 2
Since the feeding force applied to the printing paper 7 by the roller 7 is slight, the auxiliary roller 27 will rotate smoothly after the leading edge of the printing paper 7 hits the claw portion 9.
In this way, even if the printing paper 7 is inserted crookedly with respect to the registration claw 10, the auxiliary roller 2
7 and the claw portion 9, the leading edge of the printing paper 7 can be reliably aligned.

Thereafter, the solenoid 25 is turned off, the lever 23 is rotated upward by the spring 24, and the feed rollers 16 and 19 contact the platen 6 via the arm 18, thereby pressing the printing paper 7 against the platen 6. And solenoid 15
OFF, lever 13 is activated by spring 14,
The registration claw 10 is rotated counterclockwise via the shaft 11, and the claw portion 9 is retracted from the entrance path of the printing paper 7. Subsequently, the platen 6 is driven by the motor and the printing paper 7 begins to enter.
Here, since the auxiliary roller 27 is formed of a soft material, it rotates in a collapsed state when the feed roller 16 is pressed against the platen 6 side, but the pressing force by this auxiliary roller 27 is Since it is smaller than the pressing force, there is no adverse effect on paper feeding.

In this way, by arranging the auxiliary roller 27 on the same axis as the feed roller 16, the distance between the auxiliary roller 27, which is excessively fed in an attempt to correct the position of the leading edge of the printing paper 7, the registration pawl 10, and the pawl portion 9 can be brought closer to each other. As a result, the stiffness of the printing paper 7 can be fully utilized, and the leading edge of the printing paper 7 can be aligned without sagging, so positioning accuracy can be greatly improved. . In addition, there is no need to provide a separate feed roller as in the past, and the entire device can be installed below the platen 6, so there is no negative impact on the appearance of the typewriter, and at the same time the feed roller 16 and auxiliary roller 27 is integrated, the device becomes simple.

In addition, in this embodiment, the resist claw advancement/retraction mechanism 12
Although the solenoids 15 and 20 are used for the feed roller contact/separation mechanism 20, a cam or a link mechanism may also be used.

As described above, the present invention provides an auxiliary roller made of a soft member coaxially with the feed roller that contacts or separates from the platen and has a larger outer diameter than the feed roller, and this auxiliary roller is configured to be rotated by a rotating means. Therefore, before the feed roller starts driving, the recording paper is fed by the auxiliary roller driven by the rotating means and the position of the recording paper is corrected by the registration claw, thereby increasing the feeding accuracy of the recording paper. It has the effect that it can be done.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a schematic side view, FIG. 2 is a front view of the main part, and FIG. 3 is a schematic side view when inserted. 6...Platen, 7...Printing paper, 10...Register claw, 12...Register claw advancing/retracting mechanism, 20...
...Feed roller contact/separation mechanism, 27...Auxiliary roller, 29...Gear (rotating means).

Claims (1)

[Claims] 1. A resist claw is provided which is connected to a resist claw advancing/retracting mechanism to receive the leading edge of the printing paper so as to advance or retreat into the approach path of the printing paper inserted with respect to the platen, and a feed roller approach/separation mechanism to contact or move away from the platen. A feed roller is connected to the platen and presses the printing paper received by the registration claw against the platen, and an auxiliary member is formed of a soft member coaxially with the feed roller and has an outer diameter larger than the outer diameter of the feed roller. A printing paper insertion device comprising: a roller; and rotating means for rotating the auxiliary roller when the feed roller separates from the platen while the auxiliary roller maintains contact with the platen.