JPS6232865Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Purpose of the Invention] (Field of Industrial Application) The present invention relates to a paper feeding device in a printing mechanism, and relates to a mechanism for feeding paper into a printing section using a paper feeding roller and an auxiliary roller.

(Prior Art) In a conventional paper feeding device for this type of printing mechanism, a mechanism is known in which paper is fed by a paper feeding roller and an auxiliary roller disposed across the paper feeding roller and a printing section.

(Problems that the invention aims to solve) In this conventional paper feeding device, due to the precision of parts and the difference in the coefficient of friction between the paper and the rollers, when the paper is fed for a long time, wrinkles tend to occur on the printing surface, causing line irregularities, and printing The paper feed roller and the auxiliary roller are rotated at different circumferential speeds to prevent the paper from sagging in the printing section, so it is difficult to reverse the paper feed direction using the same mechanism. There was a problem that I couldn't solve.

The present invention was developed in view of the above-mentioned problems.The paper feed direction can be set to any direction using the same mechanism, and the paper does not wrinkle when paper is fed in either direction, resulting in line irregularities. To provide a paper feeding device in a printing mechanism that allows paper feeding to be carried out smoothly without any problems.

[Structure of the invention] (Means for solving the problem) The paper feeding device in the printing mechanism of the invention is arranged at a position separated from the paper feeding roller to which the pinch roller approaches and separates, and this paper feeding roller and the printing section. and an auxiliary roller to which the tension roller is pressed, and the auxiliary roller is connected to the drive system via a one-way clutch mechanism that rotates only in the direction in which the paper is fed from the paper feed roller to the auxiliary roller. The auxiliary roller has a peripheral speed higher than that of the delivery roller and has a smaller coefficient of friction than the delivery roller.

(Function) When the paper feeding device in the printing mechanism of the present invention sends the paper from the paper feeding roller toward the auxiliary roller, the paper is passed between the paper feeding roller and the pinch roller, and then between the auxiliary roller and the tension roller. insert the paper into the paper.

Next, the paper feed roller is rotated by the drive of the gear of the drive system, and the auxiliary roller operates a one-way clutch mechanism by direct or indirect engagement between the gear provided on the rotation shaft of the paper feed roller and the rotation shaft of the auxiliary roller. rotated through. When the paper feed roller and the auxiliary roller rotate by a predetermined amount, the paper is conveyed while being pinched by the pinch roller, the tension roller, the paper feed roller, and the auxiliary roller. At this time, since the peripheral speed of the auxiliary roller is faster than the paper feed roller, the paper is sent out while sliding between the auxiliary roller and the tension roller, and the surface of the paper that faces the printing section where the platen is arranged, for example, is held in a tensioned state. Ru.

When the paper is sent from the auxiliary roller toward the paper feed roller, the drive system is driven in the opposite direction, and the gears engage to rotate the paper feed roller in the opposite direction. In addition, since the one-way clutch is interposed, the auxiliary roller is not rotated, and the paper that is being conveyed while being pinched between the paper feed roller and the pinch roller is transferred between the auxiliary roller and the tension roller, which have a smaller coefficient of friction than the paper feed roller. It slides in a controlled manner, and the surface facing the printing part is tensioned.

When using the inserter, the auxiliary roller is moved around the center of rotation of the paper feed roller, and the inserter is inserted between the auxiliary roller and the tension roller. At this time, the gear on the rotating shaft of the paper feed roller that meshes with the gear on the drive system and the gear on the rotating shaft of the auxiliary roller are held in a meshed state, and the inserter is inserted between the auxiliary roller and the tension roller. Clamp and print.

(Example) The configuration of an example of the present invention will be described with reference to the drawings.

1 is a paper feed roller, and this paper feed roller 1
A platen 3 of the printing section 2 is disposed above. Further, a frame 4 is rotatably provided around the center of rotation of the paper feed roller 1, and a gear 7 that meshes with a gear 6 provided on the rotation shaft 5 of the paper feed roller 1 is rotated on a shaft 8 on this frame 4. A clutch gear 10 of a one-way clutch mechanism 9 that is freely supported and meshes with the gear 7 is rotatably provided on a shaft 11 that is mounted on the frame 4. A small auxiliary roller 12 is provided, this auxiliary roller 1
2 and the paper feed roller 1 are arranged one above the other with the printing section 2 having the platen 3 interposed therebetween.
The one-way clutch mechanism 9 is a well-known mechanism consisting of the clutch gear 10, clutch wheel 13, and clutch spring 14. The clutch wheel 13 is fixed to the shaft 11 of the auxiliary roller 12 with a knock pin 15,
and the clutch gear 10 are connected by a clutch spring 14. Further, the clutch spring 14 is covered by a cover 16.

In addition, the paper feed roller 1 includes a pinch roller 1.
7 are pressed into contact with each other by a lever mechanism (not shown) so as to be able to freely approach and separate. In addition, the tension roller 18 is connected to the shaft 1.
The lever 20 is rotatably mounted on a lever 20 so as to be rotatable about the center 9, and the lever 20 is biased by biasing means (not shown) in a direction in which the tension roller 18 is brought into pressure contact with the auxiliary roller 12.

Further, the frame 4 is biased by a spring 21 in a direction in which the auxiliary roller 12 is separated from the tension roller 18. Further, a locking pin 22 is caulked and fixed to the frame 4, and a stopper lever 24, which has an engagement recess 23 that engages with the locking pin 22, is rotatably supported by a shaft 25. The par lever 24 is a spring 26
The engaging recess 23 is biased in the direction of engaging the locking pin 22, and the topper lever 24 is formed with a locking portion 27 that engages with the locking pin 22 when the frame 4 is in a rotating state. There is. This stopper lever 24 is rotated against the spring 26 by pushing the push lever 28, the engagement recess 23 is disengaged from the locking pin 22, and the frame 4 is rotated against the locking pin 22.
is rotated by the spring 21 until it is locked in the locking part 27.

Further, the gear 6 of the paper feed roller 1 has a gear 2.
9 are meshed with each other, and a gear 30 coaxial with this gear 29 is meshed with a gear 33 provided on a drive shaft 32 of an electric motor 31, and the paper feed roller 1 and the auxiliary roller 12 are driven by the gears 33, 30, 29, 6, and 7. The system is constructed such that the circumferential speed of the auxiliary roller 12 is faster than that of the paper feed roller 1. Furthermore, 34 is a paper pan for the paper feed roller 1.

Next, the operation of this embodiment will be explained.

Transfer paper 35 from paper feed roller 1 to auxiliary roller 1
When feeding the paper toward the second side, insert the paper along the paper pan 34 and press the paper feed roller 1 and pinch roller 17.
The paper 35 is then inserted between the auxiliary roller 12 and the tension roller 18 to set the paper 35.

Next, when the electric motor 31 is driven, the gears 33, 3
0, 29, and 6 rotate clockwise in FIG. Ru. When the paper feed roller 1 and the auxiliary roller 12 rotate by a predetermined amount, the paper 35 is moved by the pinch roller 17, the tension roller 18, the paper feed roller 1, and the auxiliary roller 1.
2 and transported. At this time, since the peripheral speed of the auxiliary roller 12 is faster than the paper feed roller 1, the paper 35 is moved between the auxiliary roller 12 and the tension roller 18.
The paper 35 is fed out while sliding between the platen 3 and the opposing surfaces of the platen 3 are held in a tensioned state.

When feeding the paper 35 from the auxiliary roller 12 toward the paper feed roller 1 side, the electric motor 31 is driven in the opposite direction, and the gears 33, 30, 29, and 6 engage to move the paper feed roller 1 counterclockwise in FIG. rotated to Further, although the clutch gear 10 is rotated through the meshing of the gears 6 and 7, the auxiliary roller 12 is not rotated, and the paper 35, which is pinched and transferred between the paper feed roller 1 and the pinch roller 17, is rotated from the paper feed roller 1. The platen 3 is slid under control between an auxiliary roller 12 having a small coefficient of friction and a tension roller 18, thereby tensioning the surface facing the platen 3.

When using the inserter, when the push lever 28 is pressed, the stopper lever 24 is rotated against the spring 26, the engagement recess 23 is disengaged from the locking pin 22, and the locking portion 27 is locked. pin 22
The frame 4 is rotated by the spring 21 in the clockwise direction in FIG. 4 about the rotation center of the paper feed roller 1 until it engages with the auxiliary roller
2 and the tension roller 18, insert the inserter between the paper feed roller 1 and the pinch roller 1.
Insert between 7 and 7. At this time, gear 2 of the drive system
9 and 6 are held in an engaged state, and the lever 20 is rotated counterclockwise in FIG. 4 to return to the state shown in FIG. Clamp the inserter.

Note that the friction coefficient of the auxiliary roller 12 can be made lower than that of the paper feed roller 1 by changing the hardness of the rubber.

[Effect of idea]

According to the present invention, the auxiliary roller is connected to the drive system through a one-way clutch mechanism that rotates only in the direction in which the paper is fed from the paper feed roller to the auxiliary roller side, and the auxiliary roller has a peripheral speed higher than that of the paper feed roller. At the same time, the coefficient of friction is smaller than that of the paper feed roller, so paper can be fed from the paper feed roller to the auxiliary roller side or from the auxiliary roller to the paper feed roller side using the same mechanism, and the printing direction specifications of the printing mechanism Paper can be fed reliably even when the printing mechanism is different, and wrinkles do not form on the part of the paper that faces the printing mechanism.
This allows for good-looking printing without disrupting the printed lines, improving the versatility of the paper feed mechanism, and increasing economic efficiency.

By making the auxiliary roller and tension roller movable in directions away from each other, it is possible to print on the inserter.Furthermore, when using the inserter, the gear on the rotation axis of the paper feed roller and the rotation axis of the auxiliary roller can be moved. By making it possible to move the auxiliary roller around the center of rotation of the paper feed roller while directly or indirectly meshing with the provided gear, the drive system gear and the gear on the rotation axis of the paper feed roller remain in mesh with each other. The rotational drive of the paper feed roller can be used as is to drive the rotation of the auxiliary roller, and the number of parts can be reduced.

[Brief explanation of the drawing]

Fig. 1 is a side view of a paper feeding device of a printing mechanism showing an embodiment of the present invention, Figs. 2 and 3 are explanatory side views of the same as above in different paper feeding directions, and Fig. 4 is a normal use of the same as above. Side view in state, 5th
The figure is a side view of the same inserter in use, No. 6
The figure is a sectional view of the one-way clutch mechanism same as above. 1...paper feed roller, 2...printing section, 6,
7, 29, 30, 33... Drive system gear, 9...
One-way clutch mechanism, 12... Auxiliary roller, 1
7...Pinch roller, 18...Tension roller, 35...Paper.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A paper feed roller to which a pinch roller approaches and separates, and an auxiliary roller disposed at a position separated from the paper feed roller across the printing section and to which a tension roller is pressed, The auxiliary roller is connected to a drive system via a one-way clutch mechanism that rotates only in the direction in which the paper is fed from the paper feed roller toward the auxiliary roller, and the auxiliary roller has a peripheral speed higher than that of the paper feed roller. A paper feed device in a printing mechanism characterized by having a smaller coefficient of friction than a paper feed roller. (2) A paper feeding device in a printing mechanism according to claim 1, wherein the auxiliary roller and the tension roller are movable in directions away from each other. (3) A gear provided on the rotational shaft of the auxiliary roller and a gear provided on the rotational shaft of the paper feed roller and rotated by a gear mechanism of the drive system are meshed and interlocked, and the A paper feeding device in a printing mechanism according to claim 2, characterized in that the auxiliary roller is movable.