JP2752926B2 - Printer media holding device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a medium holding device for holding a print medium inserted in a printer.

[0002]

2. Description of the Related Art Printing media (medium) inserted into a printer
A conventional medium pressing device for holding a medium includes a medium pressing actuator for pressing and holding a medium, and a medium guide plate provided opposite to the medium pressing actuator. The medium is held between the medium itself and the actuator itself or a member that operates in conjunction with the actuator by operating the medium.

[0003]

The above-described conventional medium press device of the printer has a force for holding and holding the medium,
That is, since the force for pulling out the held medium is constant,
There is a drawback in that it is not possible to judge a medium that has been ejected after the printing process has ended and a medium that is in the middle of the printing process and that is in the retracted state based on the difference in the pulling force.

In order to make such a determination, two types of medium pressing devices, a medium pressing device having a strong pressing force and a medium pressing device having a weak pressing force, are provided. However, such a means is not an essential countermeasure because such a measure causes an increase in the size and cost of the printer.

Further, the above-described conventional medium press device of a printer employs a method in which the medium is sandwiched and fixed between the medium press device and the medium guide plate. And the like.

[0006]

According to the present invention, there is provided a medium holding device for a printer, comprising: a fan-shaped medium holding member in which a medium holding portion at a leading end is formed of a saw-toothed rubber member; and a drive unit for driving the medium holding member to an operating position. And a spring for holding the operating position and the retreat position of the medium pressing member at positions on both sides of the dead center, and further comprising the medium pressing member at a position facing the medium pressing member. And a medium guide plate provided with a groove having a width larger than the thickness of the medium and a depth not contacting the medium pressed by the medium pressing member.

[0007]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a front view showing an embodiment of the present invention,
FIG. 2 is a sectional view taken along line AA of FIG.

In FIG. 1, a medium pressing member 1 is rotatable around a rotation center 3, and a medium pressing portion 2 at a tip end (lower end) is formed of a rubber member and has a sawtooth shape. I have. The upper end of the medium pressing member 1 is coupled to the operating portion of the actuator 4 and is driven to rotate in the direction of arrow B, moves to the operating position by moving in the direction of arrow B, and moves in the direction of arrow C. To the evacuation position. The actuator 4 moves the medium pressing member 1 in the direction of arrow B by the suction motion, and moves the medium pressing member 1 in the direction of arrow C by the return motion. Medium holding member 1
In order to restrict the movement in the direction of arrow C, an operation restricting member 5 is provided. The movement of the medium holding member 1 in the direction of arrow B is regulated by the operation limit point of the actuator 4.
Below the rotation center 3 of the medium holding member 1, a spring hook 6
The other end of the tension coil spring (spring) 8 having one end locked to the spring hook 6 is locked to a fixed spring hook 7 provided diagonally above the rotation center 3. . Accordingly, when the medium holding member 1 moves in the direction of arrow B, the spring holding portion 6 moves to the right of the line connecting the spring holding portion 7 and the rotation center 3, and when the medium holding member 1 moves in the direction of arrow C. Moves to the left of the line connecting the spring hook 7 and the rotation center 3. That is, the spring 8 is provided on the right or left side of the dead center depending on the operation state of the medium pressing member 1.
Works stably.

A medium guide plate 9 is provided below the medium holding member 1.
Is provided, and the print medium (medium) is transported between the print medium (medium) and the upper medium guide plate 12 provided thereon. As shown in FIG. 2, a groove 1 having a width larger than the thickness of the medium pressing member 1 is provided at a position of the medium guiding plate 9 facing the medium pressing member 1.
0 is provided. The depth of the groove 10 depends on the medium holding member 1.
The depth of the medium 11 pressed by the above-described method is such that the medium 11 is not in contact with the bottom surface of the groove 10. Next, the operation of the medium pressing device configured as described above will be described.

In the initial state of the printer, the medium pressing member 1 is in the retracted position (the position moved in the direction of arrow C in FIG. 1).
The position of the reference numeral 1a indicated by a two-dot chain line), when the medium 11 is inserted and the printer 4 is in a state of waiting for the printing process and the actuator 4 operates, the medium pressing member 1 resists the force of the spring 8 Rotating in the direction of arrow B, the medium presser 2 deforms the medium 11 conveyed between the medium guide plate 9 and the upper medium guide plate 12 and pushes the medium 11 into the groove 10. The printing operation is performed in this state, and the medium 11 is conveyed to the inside of the printer while being partially pushed into the groove 10. Therefore, the medium 11 is transported without receiving a large resistance. When a part of the medium 11 is pushed into the groove 10, the width of the groove 10 larger than the thickness of the medium pressing member 1 is larger than the thickness of the medium pressing member 1, and the depth of the groove 10 is Because of the depth that does not make contact, and that the medium pressing portion 2 is formed of a rubber member,
No scratches or dents are generated on the medium.

When the printing operation is completed, the medium 11 is discharged. At this time, the saw-toothed portion of the medium pressing portion 2
In order to apply a large frictional force to the medium 11 in contact with the medium 1, the medium 11 to be ejected rotates the medium holding member 1 in the direction of arrow C against the force of the spring 8, Move up to The medium 11 is subsequently discharged to a predetermined position.

When the ejection of the medium 11 is completed, the actuator 4 is operated again, the medium pressing member 1 is rotated in the direction of arrow B, and the medium pressing section 2 presses and holds the medium 11. If you try to pull out the medium 11 by hand in this state,
Since the medium 11 has a large resistance due to the suction force of the actuator 4, it cannot be easily pulled out.
When the suction force of the actuator 4 is cut off, the medium holding member 1 can be easily rotated in the direction of arrow C, so that the medium 11 can be pulled out with a small force.

[0014]

As described above, the medium holding device of the printer according to the present invention has a fan-shaped medium holding member in which the tip of the medium holding portion is formed of a saw-toothed rubber member, and the medium holding member is moved to the operating position. An actuator for driving, and a spring for holding the operating position and the retreat position of the medium pressing member at positions on both sides of the dead center, and a width larger than the thickness of the medium pressing member at a position facing the medium pressing member And a medium guide plate provided with a groove having a depth not contacting the medium pressed by the medium pressing member. There is an effect that it is possible to easily determine the medium in the retracted state based on the difference in the pulling force, and it is also possible to prevent the medium from being scratched or indented.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Medium press member 2 Medium press part 3 Rotation center 4 Actuator 5 Operation restricting member 6 Spring hook part 7 Spring hook part 8 Tension coil spring (spring) 9 Medium guide plate 10 Groove 11 Medium 12 Upper medium guide plate

Claims (2)

(57) [Claims] 1. A fan-shaped medium holding member having a medium holding portion formed of a sawtooth-shaped rubber member at an end thereof, an actuator for driving the medium holding member to an operation position, and an operation position and a retreat position of the medium holding member. And a spring for holding the spring at positions on both sides of the dead center. 2. A medium guide plate provided with a groove having a width larger than the thickness of the medium pressing member and a depth not contacting the medium pressed by the medium pressing member at a position facing the medium pressing member. The medium press device of the printer according to claim 1, wherein: