JPH0696417B2 - Pinch roller holding device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pinch roller holding device for conveying a sheet by a feed roller and a pinch roller driven by a motor.

Conventional Technology First, a typical conventional structure is shown in FIG. That is,
Roller arms 51 are rotatably held by support shafts 52 on both sides of the frame 50, and a shaft portion of a pinch roller 53 that faces a feed roller (not shown) is supported on these roller arms 51.
54 is rotatably supported. Further, torsion coil springs 55 are wound around both sides of the support shaft 52, and the hooks of these torsion coil springs 55 are provided on the frame 50 as a support shaft 57.
And the roller arm by contacting the roller arm 51
Is urged toward the feed roller. Therefore, by rotating the frame 50 about the support shaft 57, the pinch roller 53 is separated from the feed roller to set the paper, and after the paper is set, the frame 50 is rotated to the original position and the torsion coil spring 55 is set. The pinch roller 53 is elastically brought into contact with the paper on the feed roller by the force of.

Problems to be Solved by the Invention In the device for holding the pinch roller 53 as described above,
A frame 50 is rotatably provided to set the paper,
In order to elastically contact the pinch roller 53 with the feed roller, a supporting member such as a displaceable roller arm 51 and a spring such as a torsion coil spring 55 are required. Therefore, the number of parts and the number of assembling steps increase, and in particular, a tool is required to bend the hook 56 of the torsion coil spring 55 during assembling, which makes the assembling work troublesome.

Means for Solving the Problems A frame, which is held so as to be capable of coming into contact with and separating from a feed roller driven by a motor and fixed at an arbitrary position, is provided with an arc surface that comes into contact with the shaft portion of a pinch roller. A leaf spring for urging the blade roller toward the feed roller is provided on the frame, and a supporting piece for supporting the shaft portion of the pinch roller urged by the leaf spring is integrally formed on the frame.

Therefore, the shaft of the pinch roller is held by the supporting piece integrally formed on the frame and the arc surface of the leaf spring, and when the pinch roller is in contact with the feed roller, the leaf spring elastically bends. The pinch roller is bent and brought into pressure contact with the feed roller by its reaction force, and the shaft portion of the pinch roller that rotates is supported by the arc surface formed on the leaf spring. Therefore, the number of parts and the number of assembly steps are reduced.

In addition, a support piece having an engaging portion that engages with the rear end portion of the leaf spring, and a pressing portion that presses the intermediate portion of the leaf spring toward the support piece and the supporting piece are integrally formed on the frame. By facilitating the attachment of the leaf spring to the frame, and further by integrally forming on the frame, a projecting piece that faces the supporting piece that abuts on one side edge of the leaf spring and abuts the other side edge of the leaf spring, The leaf spring is prevented from touching by these supporting pieces and the projecting pieces.

Embodiment An embodiment of the present invention will be described with reference to FIGS. 1 to 3. First, FIG. 3 shows the entire structure. Top cover 1
A pair of left and right arms 2 is held by a support shaft 3 so as to be vertically rotatable. These arms 2 are connected by a connecting shaft 4 and a carrier shaft 5, and a carrier 7 holding a print head 6 is slidably held by the carrier shafts 5, 8. One carrier shaft 8 is the upper cover 1
Are installed on both sides of.

Next, the lower cover 9 is fixedly provided with a platen 10 facing the front end of the print head 6 and a guide plate 12 for guiding a long sheet 11 such as receipt paper or journal paper to the platen 10. There is. A feed roller 13 located near the platen 10 is rotatably supported by a motor (not shown) on the lower cover 9 and a frame 14 is rotatably held by a support shaft 15. There is. A clamp (not shown) for fixing the frame 14 in place is provided on the lower cover 9.

Then, as shown in FIG. 1 and FIG.
Openings 16 are formed on both rear sides of the upper surface of 14 and support pieces 18 having projections 17 as engaging portions are integrally formed on the rear edges of these openings 16 and are formed at the front edge of the opening 16 downwardly. A pressing portion 19 that bends to is integrally formed. Further, a pair of left and right support pieces 20 and a projecting piece 21 located outside the support pieces 20 are integrally formed on the front edge of the frame 14. Further, a pair of left and right leaf springs 26 having an arcuate surface 24 and a locking hole 25 that come into contact with the outer peripheral surface of the shaft portion 23 protruding from both ends of the pinch roller 22 are provided. At the rear ends of these leaf springs 26, the locking holes 25 are fitted to the projections 17 and supported by the support pieces 18, the middle portions are pressed by the pressing portions 19 and curved, and the arc surfaces 24 at the tips are pinch rollers. It is pressed against the outer peripheral surface of the shaft portion 23 of 22. Further, the shaft portion 23 is formed with a step portion 27 that abuts against one side edge of the leaf spring 26. In addition, another pinch roller is attached to the arm 2.
28 is rotatably supported, and a feed roller 29 facing the pinch roller 28 is rotatably supported by the lower cover 9.

In such a configuration, the clamp 11 is removed from the state shown in FIG. 3 and the frame 14 is maintained in a state of being rotated counterclockwise around the support shaft 15 so that the paper 11 is fed to the feed roller 13 and the pinch roller 22. Pass between And the support shaft 15
The frame 14 is rotated clockwise around the center and is fixed by the clamp. In this state, as shown in FIG. 3, the pinch roller 22 contacts the feed roller 13 and the contact force causes the tip of the leaf spring 26 to bend upward. That is, the pinch roller 22 presses the sheet 11 against the platen 10 by the pressure of the leaf spring 26. In this state, the print head 6 prints on the paper 11, and the paper 11 is fed by rotating the feed roller 13 counterclockwise.

In this way, the shaft portion 23 of the pinch roller 22 is rotatably supported by the tip of the leaf spring 26 that biases the pinch roller 22 toward the feed roller 13, that is, the arc surface 24, so that the pinch roller 22 is supported only. It is not necessary to use a roller arm for the purpose of. Further, the locking hole 25 is engaged with the projection 17 to bring the rear end of the leaf spring 26 into contact with the support piece 18, push the arc surface 24 upward, and bring the leaf spring 26 into contact with the pushing portion 19 to bend. By inserting the shaft portion 23 between the arc surface 24 and the support piece 20 in this state, the leaf spring 26 and the pinch roller 22 can be easily assembled to the frame 14 without using a tool. Further, the support piece 20 and the projection piece 21 can prevent the leaf spring 26 from swinging in the left-right direction. Further, the step portion of the leaf spring 26 and the shaft portion 23
The contact with the pinch roller 27 prevents the pinch roller 22 from moving in the axial direction.

When printing on the slip 30 or the like, the slip 30 is inserted from the front side of the upper surface of the frame 14 between the platen 10 and the print head 6, and is printed by the print head 6 and fed by the feed roller 29 and the pinch roller 28.

EFFECTS OF THE INVENTION Since the present invention is configured as described above, the shaft portion of the pinch roller can be held by the supporting piece integrally formed on the frame and the arc surface of the leaf spring, and the pinch roller can be used as the feed roller. In the contacted state, the leaf spring is elastically flexed, and the reaction force of the leaf spring can press the pinch roller against the feed roller. Further, the arcuate surface of the leaf spring rotates the pinch roller shaft. Therefore, the number of parts and the number of assembling steps can be reduced, and further, the support piece having the engaging portion that engages with the rear end portion of the leaf spring and the intermediate portion of the leaf spring can be provided. By integrally forming the supporting piece and the pressing portion that presses against the supporting piece side on the frame, the leaf spring can be easily attached to the frame, and the supporting piece that abuts against one side edge of the leaf spring. Opposed to Then, by integrally forming the projecting piece that abuts against the other side edge of the leaf spring on the frame, it is possible to prevent the leaf spring from being touched by the supporting piece and the projecting piece. Have.

[Brief description of drawings]

1 to 3 show an embodiment of the present invention. FIG. 1 is a perspective view, and FIG. 2 is an exploded perspective view showing a partially enlarged structure of attaching a leaf spring to a frame. FIG. 3 is a vertical sectional side view showing the entire structure, and FIG. 4 is a perspective view showing a conventional example. 13 …… Feed roller, 14 …… Frame, 17 …… Projection (engaging part), 18 …… Support piece, 19 …… Pressing part, 20 …… Support piece, 21 …… Projection piece, 22 …… Pinch roller, 23 ... Shaft, 24
...... Arc surface, 26 ...... Leaf spring, 27 ...... Step

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP 62-65860 (JP, A) actual development 63-154551 (JP, U) actual development 62-183651 (JP, U) actual development 58- 176830 (JP, U) Actually opened 61-197039 (JP, U)

Claims (4)

[Claims] 1. A frame, which is held by a motor-driven feed roller so as to be able to come into contact with and separate from the feed roller and to be fixed at an arbitrary position, has an arc surface which comes into contact with a shaft portion of a pinch roller, and the shaft portion is used for the feed roller. A pinch roller holding device is characterized in that a plate spring for urging the plate spring is provided on the frame, and a supporting piece for supporting a shaft portion of the pinch roller urged by the plate spring is integrally formed on the frame. . 2. A frame, which is held so as to be capable of coming into contact with and separating from a feed roller driven by a motor, and fixed at an arbitrary position, has an arc surface which comes into contact with a shaft portion of a pinch roller, and the shaft portion is used as the feed roller. A leaf spring for urging the leaf spring, a supporting piece for supporting the shaft portion of the pinch roller urged by the leaf spring, and an engaging portion for engaging a rear end portion of the leaf spring. A pinch roller, characterized in that a supporting piece that comes into contact with the rear end of the leaf spring and a pressing portion that presses the intermediate portion of the leaf spring toward the supporting piece and the supporting piece are integrally formed on the frame. Holding device. 3. A frame, which is held so as to be able to come into contact with and separate from a feed roller driven by a motor and to be fixed at an arbitrary position, has an arc surface that comes into contact with a shaft portion of a pinch roller, and the shaft portion is used as the feed roller. A leaf spring for urging the leaf spring, a supporting piece for supporting the shaft portion of the pinch roller urged by the leaf spring, and an engaging portion for engaging a rear end portion of the leaf spring. A support piece that contacts the rear end of the leaf spring, a pressing portion that presses the intermediate portion of the leaf spring toward the support piece and the support piece, and a support piece that abuts one side edge of the leaf spring. A pinch roller holding device characterized in that a projecting piece that comes into contact with the other side edge of the lever spring is integrally formed with the frame. 4. The pinch roller holding device according to claim 3, wherein a step portion that abuts against one side edge of the arc surface of the leaf spring is formed on the shaft portion of the pinch roller.