JPH0534265B2 - - Google Patents

Description

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

Prior Art As shown in FIG. 4, paper bail roller 5
There is a device in which a pair of left and right arms 51 that hold 0 are biased by a spring 52 so as to be rotatable, and the arms 51 are moved away from the platen 53 when setting paper.

Problems to be Solved by the Invention However, in order to maintain the paper bail roller 50 in a state separated from the platen 53, it is necessary to
The arm 51 must be rotated to a position where the anchoring point 54 at one end of the arm 51 crosses a straight line connecting the anchoring point 55 at the other end and the rotation center 56 of the arm 51. Therefore, the range of rotation of the arm 51 is widened, space is wasted, and a cover (not shown) covering the top of the platen 53 must be removed 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 10 is supported is provided so as to be rotatable by urging it toward the platen 3 side. A locking body 13 is biased in one direction and slidably fitted to the end, and a contact surface 17 that contacts the locking body 13 is fixedly provided facing the side surface of the arm 8. A locking portion 18 is formed on an extended surface of the contact surface 17 to elastically engage the locking body 13 when the platen 3 moves away from the platen 3.

Function: 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 the contact surface 17 and engages with the locking portion 18 to prevent the arm 8 from returning toward the platen 3. This makes it possible to keep the range of rotation of the arm 8 to the necessary minimum.

Embodiment An embodiment of the present invention will be described based on the drawings. A U-shaped cutout groove 5 for holding the bearing 4 of the printing head 2 and the opposing platen 3 on the opposing side plate 1.
are formed, and a presser member 6 that presses these bearings 4 to the bottom of the notched groove 5 is fixed to the side plate 1 with screws 7.

Further, a pair of left and right arms 8 are rotatably supported on the side plate 1 and urged counterclockwise by a spring 9. These arms 8 hold both ends of a roller shaft 11 that rotatably supports a paper bail roller 10. Furthermore, locking bodies 1 are provided at both ends of the roller shaft 11 and are urged outward by springs 12.
3 is slidably fitted. That is, a groove 15 into which a pin 14 driven into the roller shaft 11 is inserted is formed in the locking body 13 along the axial 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 and this contact surface 1
The locking part 18 is a U-shaped notch that opens at the end of the arm 7 and engages with the protrusion 16, and the protrusion 19 that contacts the outer periphery of the locking body 13 interferes with the locus surface on which the arm 8 rotates. A stopper 20 is integrally formed with the stopper 20, which protrudes so that the arm 8 comes into contact with the stopper 20, thereby restricting the range of rotation of the arm 8.

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,
Although the locking body 13 is biased, it 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 10 is maintained in a state separated from 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 20 comes into contact with the arm 8. Therefore,
Excessive movement of arm 8 is prevented.

In this way, the paper bail roller 10 is maintained at a slight distance from the platen 3, so the rotation range of the arm 8 can be limited to the necessary minimum, thereby reducing the mounting space for parts. Platen 3
Paper can be set without removing the cover (not shown) that covers the paper. Since the contact surface 17, 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. This limits the range of rotation of the arm to the necessary minimum, reducing space and making the machine more compact. It also has the effect of allowing paper to be easily set without removing the cover.

[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. 1... Side plate, 3... Platen, 4... Bearing, 5
... Notch groove, 6 ... Pressing member, 8 ... Arm, 1
0... Paper bail roller, 11... Roller shaft, 13... Locking body, 17... Contact surface, 18...
Locking part, 20... stopper.

Claims (1)

[Scope of 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 provided rotatably, and a locking body is attached to the end of the roller shaft in one direction. The locking body is biased to slidably fit into the platen, 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 movement is fixedly provided opposite the side surface of the arm, and a locking part with which the locking body elastically engages 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 that hold a roller shaft supported by a paper bail roller are biased toward the platen side and provided rotatably, and a locking body is biased in one direction at the end of the roller shaft to allow sliding. an abutment that is movably fitted and abuts against 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 surface is fixedly provided opposite to a side surface of the arm, and a locking portion with which the locking body elastically engages 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. A cutout groove for holding a platen bearing is formed in opposing side plates, and a pressing member that presses the bearing to the bottom of the cutout groove is fixed to the side plate to hold 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 biased in one direction and slidably fitted to the end of the roller shaft, so as to make contact with the locking body. A contact surface is formed on the holding member to prevent the locking body from moving in the axial direction and to allow movement of the locking body in a direction perpendicular to the axis of the platen. A paper holding device for a printing machine, characterized in that a locking portion with which the locking body elastically engages when moving away from the platen is formed on an extended surface of the contact surface.