JPS6231652A - Paper pressing device for printer - Google Patents

Abstract

PURPOSE:To reduce the space thus to reduce the size of paper stopper by setting a paper while slightly separating a paper veil roller from the platen through engagement of stopping member and stopping section. CONSTITUTION:The arm 8 is energized by a spring 9 to rotate thus to contact the paper veil roller 10 resiliently against a platen 3. Under this condition, the stopping member 13 is energized but contacts against the contacting face 17 to be blocked from axial motion. When setting a paper, the arm 8 is lifted to separated the paper veil roller 10 from the platen 3. Here, the stopping member 13 will slide outward through the spring force to engage the projection 16 resiliently with the stopping section 18. Consequently, the paper veil roller 10 is maintained under the condition separated from the platen 3. Under this condition, the outer circumference of stopping member 13 will contact against a projection 19 while the stopper 20 will contact against the arm 8 thus to block excessive motion of arm 8.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a paper holding device for a printing machine.

BACKGROUND ART As shown in FIG. 4, a pair of left and right arms 51 that hold a paper bail roller 50 are biased by springs 52 and are rotatably provided, and when setting paper, the arms 51 are separated from the platen 53. There is something that makes it so.

Problem to be Solved by the Invention However, in order to maintain the paper bail roller 50 in a state separated from the platen 53, the attachment point 54 at one end of the spring 52 must be connected to the attachment point 55 at the other end by the rotation of the arm 51. center 56
A51 must be rotated to a position beyond the straight line connecting the two. Therefore, the rotation range of the arm 1151 becomes wide, space is wasted, and it is necessary to remove a cover (not shown) covering the top of the platen 53 to set the paper.

Means for Solving the Problems In the present invention, a pair of left and right arms 8 holding a roller shaft 11 on which a paper bail roller 1o is supported is connected to a platen 3.
A contact surface 17 is provided so as to be biased toward the side and rotatable, and a locking body 13 is slidably fitted to the end of the roller shaft 11 while being biased in one direction, and abuts against the locking body 13. is fixedly provided facing the side surface of the arm 8, and a locking portion 18 that elastically engages with the locking body 13 when the arm\8 moves away from the platen 3 is provided on the extension surface of the contact surface 17. Form on top.

Therefore, when setting paper, the arm 8 is lifted to move the paper bail roller 10 away from the platen 3. At this time, the locking body 13 slides on the contact surface 17 and the locking part 1
8 to prevent the arm 8 from returning in the direction of the platen 3. This makes it possible to keep the range of rotation of the arm 8 to the necessary minimum.

Example An embodiment of the present invention will be described based on the drawings.

A print head 2 and a platen 3 facing each other are disposed on opposing side plates 1.
A U-shaped cutout groove 5 for holding the bearings 4 is formed, and a pressing member 6 for pressing the bearings 4 against the bottom of the cutout groove 5 is fixed to the side plate 1 by screws 7.

Further, a pair of left and right arms 8 are rotatably supported on the side plate 1 and urged counterclockwise by springs 9. These arms 8 hold both ends of a roller shaft 11 that rotatably supports a paper bail roller 10. Furthermore, locking bodies 13 which are urged outward by springs 12 are slidably fitted to both ends of the roller shaft 11. That is, the locking body 13 has a pin 14 driven into the roller shaft 11.
A groove 15 into which the holder is inserted is formed along the glaze direction, and a hemispherical protrusion 16 is integrally formed at the tip. The presser member 6 has a contact member that comes into contact with the protrusion 16 of the locking body 13 to prevent the locking body 13 from moving outward and to allow movement in a direction perpendicular to the axis of the platen 3. Surface 17
A locking portion 18 formed by a U-shaped notch that opens at the end of this contact surface 17 and engages with the protrusion 16, a protrusion 19 that abuts the outer periphery of the locking body 13, and a portion of the arm 8. A stopper 20 that comes into contact with the part is integrally formed.

In such a configuration, the arm 8 is urged by the spring 9 to rotate, and the paper bail roller 10 comes into elastic contact with the platen 3. In this state, the locking body 13 is biased, but comes into contact with the contact surface 17 and is prevented from moving in the axial direction. When setting paper, the arm 8 is lifted to move the paper bail roller 10 away from the platen 3.

At this time, the locking body 13 slides outward due to the force of the spring 12, and the protrusion 16 elastically engages with the locking portion 18. Therefore, the paper bail roller 1o is maintained in a state opposite to the platen 3. Further, in this state, the outer periphery of the locking body 13 comes into contact with the protruding piece 19, and the stopper 2o comes into contact with the arm 8. Therefore, excessive movement of the arb 8 is prevented.

In this way, the paper bail roller 10 is maintained at a slight distance from the platen 3, so that the arm 8
The range of rotation of the platen 3 can be limited to the necessary minimum, thus reducing the mounting space for parts and making it more compact. Paper can be set without removing the cover (not shown) that covers the platen 3. It becomes possible to do so. Contact surface 17
Since the locking portion 18 and the stopper 20 are also formed integrally with the holding member 6 that presses the bearing 4, the number of parts can be reduced.

Effects of the Invention Since the present invention is configured as described above, the paper bail roller can be maintained in a state slightly separated from the platen by the engagement between the locking body and the locking portion, and the paper can be set. As a result, the rotation range of the arm is limited to the necessary minimum, making it possible to reduce the space and size of the JS, and also has the effect of easily setting paper without removing the cover. has.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the present invention, in which FIG. 1 is an exploded perspective view, FIG. 2 is a side view showing the paper bail roller in a state separated from the platen, and FIG. FIG. 4 is a side view showing a state in which the paper bail roller is in contact with the platen, and FIG. 4 is a side view showing a conventional example.

Claims (1)

[Claims] 1. A pair of left and right arms holding a roller shaft on which a paper bail roller is supported is biased toward the platen side and is rotatably provided, and a locking body is attached to the end of the roller shaft. The locking body is biased in the direction and slidably fitted, and comes into contact with the locking body to prevent the locking body from moving in the axial direction, and the locking body moves in a direction perpendicular to the axis of the platen. A contact surface that allows the movement of the arm is fixedly provided opposite to the side surface of the arm, and a locking portion that elastically engages with the locking body when the arm moves away from the platen is provided on the arm. A paper holding device for a printing machine, characterized in that it is formed on an extended surface of a contact surface. 2. A pair of left and right arms holding a roller shaft on which a paper bail roller is supported is biased toward the platen side and provided rotatably, and a locking body is biased in one direction at the end of the roller shaft. A part that is slidably fitted and comes into contact with the locking body to prevent movement of the locking body in the axial direction and to allow movement of the locking body in a direction perpendicular to the axis of the platen. A contact surface is fixedly provided opposite to a side surface of the arm, and a locking part that elastically engages with the locking body when the arm moves away from the platen is provided on an extension surface of the contact surface. A paper holding device for a printing machine, further comprising a stopper that contacts the arm and limits a range of movement of the arm away from the platen. 3. Forming a notched groove for holding the bearing of the platen on opposing side plates, fixing a pressing member to the side plate to press the bearing to the bottom of the notched groove, and holding the roller shaft on which the paper bail roller is supported. A pair of left and right arms are biased toward the platen side and rotatably provided, and a locking body is pressed in one direction and slidably fitted to the end of the roller shaft, and a locking body is fitted to the end of the roller shaft in a slidable manner. A contact surface is formed on the holding member to prevent the locking body from moving in the axial direction and to allow the locking body to move in a direction perpendicular to the axis of the platen. A paper holding device for a printing machine, characterized in that a locking portion that resiliently engages with the locking body when moving away from the platen is formed on an extended surface of the contact surface.