JP3758016B2 - Printer paper feed mechanism - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a paper feeding mechanism of a printer, and more particularly to a paper feeding mechanism of a printer that enables paper feeding suitable for each of cut sheet paper and continuous paper.
[0002]
[Prior art]
In a small-sized printer capable of recording and writing on each cut paper and continuous paper, a cut paper feeding mechanism is generally disposed above the push tractor for feeding continuous paper, and reaches the platen. As for the paper feed path, the paper path has a certain inclination angle so that the cut paper can bite the platen by falling under its own weight. As a result of the difference between the path lengths of the upper layer paper and the lower layer paper due to being too tight, an inconvenience that an interlayer shift may occur occurs.
[0003]
[Problems to be solved by the invention]
The present invention has been made in view of such problems, and an object of the present invention is to provide a new printer paper feed mechanism capable of forming a paper path suitable for each feed of cut paper and continuous paper. There is to do.
[0004]
[Means for Solving the Problems]
That is, according to the present invention, as a paper feeding mechanism of a printer for achieving such a problem, a paper drawing-in guide surface is provided on the upper surface of the paper guide member in the paper conveyance direction, and the platen peripheral surface is provided on the lower surface. The paper guide member is formed with a delivery guide surface for delivering the paper to the surface, and two rollers are disposed on the paper guide member so as to be in contact with and separated from the peripheral surface of the platen in the paper transport direction. The member presses the two rollers against the peripheral surface of the platen in the cut paper transport mode and the inclination angle of the pull-in guide surface is increased, and the transport direction in the continuous paper transport mode. The upper roller is separated from the peripheral surface of the platen, the lower roller is pressed against the peripheral surface of the platen, and is swingably disposed so that the inclination angle of the pull-in guide surface is relaxed. It was.
[0005]
[Action]
With this configuration, when transporting the cut paper, the roller is pressed against the peripheral surface of the platen and the paper guide member is displaced so as to increase the inclination angle of the pull-in guide surface. Improves the bite to the platen due to the free fall of the voting paper. When transporting continuous paper, the roller is moved away from the platen and the guide surface for pulling is displaced so that the inclination angle becomes gentle. The curvature of the path is loosened so that the gap between the layers does not occur.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Therefore, examples of the present invention will be described below.
All the drawings show one embodiment of the present invention.
[0007]
FIG. 1 shows a first embodiment of the present invention. A movable guide block in which two pinch rollers 4 and 5 are axially supported along the platen 10 on the upper side of the recording / writing section in the paper conveying direction. 3 is swingably attached.
[0008]
When the sheet to be fed is a cut sheet, the movable guide block 3 presses the two front and rear pinch rollers 4 and 5 against the peripheral surface of the platen 10 as shown in FIG. When the paper guide path tilt angle θ with respect to the horizontal plane is increased with respect to the arrangement surface of the pinch roller 4 and the pinch roller 5, and when continuous paper is fed, it is shown in FIG. As described above, the pinch roller 4 on the upper side in the paper conveyance direction is moved away from the peripheral surface of the platen 10 and the inclination angle φ of the paper guide path is made smaller than the arrangement surface of the pinch roller 4 and the pinch roller 5. It is configured.
[0009]
In other words, the movable guide block 3 is configured such that the upper surface on the upper side in the paper conveyance direction is a flat drawing-side guide surface 3a, and the upper surface on the lower side in the paper conveyance direction is a concave curved delivery-side guide surface 3b along the peripheral surface of the platen 10. Are provided so that the two front and rear pinch rollers 4 and 5 pivotally supported along the guide surfaces 3a and 3b are pressed against the peripheral surface of the platen 1 by the biasing force of the spring 6. An operation cam rod 8 having a D-shaped cross section is rotatably inserted in the window hole 7 that is provided on the upper side of the movable guide block 3 in the paper conveyance direction, and is spaced apart from the lower edge 7 a of the window hole 7. When the operation cam rod 8 is rotated so that the two-pinch rollers 4 and 5 are pressed against the peripheral surface of the platen 10 by the biasing force of the spring 6, the drawing-side guide surface 3a feeds the cut sheet paper. Retracting side guide surface facing the feeding section 11 When a large inclination angle θ is given to a and the operation cam rod 8 is rotated so as to press the lower edge 3 a of the window hole 7, only the pinch roller 4 on the lower side in the paper conveying direction is attached to the platen 10. The pull-in side guide surface 3a is configured to be given a small inclination angle φ so that the pull-in side guide surface 3a faces the push tractor 12 in a state where the pull-in side guide surface 3a is in contact with the peripheral surface.
[0010]
In the embodiment constructed as described above, a lever (not shown) is operated to record and write on the cut sheet S1 to rotate the operation cam rod 8 having a D-shaped section, and the cam rod 8 is moved to the window. When separated from the lower end 7 a of the hole 7, the movable guide block 3 presses the two front and rear pinch rollers 5, 5 against the peripheral surface of the platen 10 by the biasing force of the spring 6, as shown in FIG. Meanwhile, the surface of the movable guide block 3 is greatly inclined upwardly with the drawing-side guide surface 3a directed toward the feeding unit 11 of the cut sheet S1.
[0011]
For this reason, the cut sheet S1 fed to the guide surface is greatly curved while being guided from the greatly inclined drawing side guide surface 3a to the delivery guide surface 3b, and the two pinch rollers 5, 5 It is conveyed to the recording / writing section while being pressed strongly against the peripheral surface.
[0012]
On the other hand, in order to perform recording and writing on the continuous paper S2, the operation cam rod 8 having a D-shaped section is rotated through a lever (not shown), and a window is partially opened as shown in FIG. When the lower edge 7a of the hole 7 is pressed, the movable guide block 3 receiving the urging force of the spring 6 rotates clockwise in the figure with the lower edge 7a of the window hole 7 as a fulcrum, and is pinched on the lower side in the paper conveying direction. While only the roller 4 is in contact with the peripheral surface of the platen 1, the inclination angle φ of the pull-in side guide surface 3 a is weakened and this surface 3 a is directed toward the push tractor 12.
[0013]
For this reason, the continuous paper S2 fed by the push tractor 12 draws a small curvature from the drawing side guide surface 3a to which the gentle inclination angle φ is given to the concave delivery guide surface 3b, while the upper layer paper and the lower layer paper are drawn. The sheet is fed from the peripheral surface of the platen 10 to the recording / writing section without causing any interlayer displacement.
[0014]
FIG. 2 shows a second embodiment of the present invention.
In the figure, reference numeral 22 denotes a fixed guide block 7 for guiding the cut paper S1 and the continuous paper S2. The upper half of the guide block 22 has a comb-tooth shape, and the upper surface on the upper side in the paper conveying direction is A flat pull-in guide surface 22a facing the push tractor 12 is formed, and a concave-shaped delivery guide surface 22b along the peripheral surface of the platen 10 is formed on the upper surface on the lower side in the paper transport direction.
[0015]
On the other hand, the movable guide block for guiding the cut sheet S1 indicated by reference numeral 23 in the figure has a comb-tooth shape so that it can protrude from the fixed guide block 22, and two pinch rollers 24 pivotally supported in the front and rear directions. 25 is urged by a spring 26 interposed between the fixed guide block 23 and the movable guide block 23 so as to be constantly pressed toward the peripheral surface of the platen 10. A pull-in guide surface 23a having a large inclination angle θ for guiding the cut sheet S1 is formed in one half of the upper side of the direction, and the upper surface on the lower side of the paper transport direction is along the transfer guide surface 22b of the fixed guide block 22. In this way, when the cut paper is transported, the operation cam rod 28 inserted into the window hole 27 is separated from the lower edge 27a. The movable guide block 23 is pushed up by the urging force of the spring 26 so that the pull-in side guide surface 23a protrudes on the fixed guide block 22, and the lower edge 27a of the window hole 27 is pushed down by the operation cam rod 28 during continuous paper conveyance. Thus, the retracting side guide surface 23 a is configured to be buried in the fixed guide block 22.
[0016]
Reference numeral 22 c in the figure denotes a stopper that suppresses over-rotation of the movable guide block 23 by abutting against the restriction surface 22 c of the fixed guide block 22.
[0017]
When the cut sheet S1 is guided by the embodiment configured as described above, the operation cam rod 28 is rotated so as to be separated from the lower edge 27a of the window hole 27 as shown in FIG. The movable block 23 is pushed up by the urging force of the spring 26 so that the two front and rear pinch rollers 24 and 25 are pressed against the peripheral surface of the platen 10, and the drawing-side guide surface 23a on the upper side in the paper conveying direction is fixed to the fixed guide block. 22 is projected on the drawing-in side guide surface 23a to form a large curvature in the paper conveyance path, so that the cut sheet S1 bites the platen 10 better.
[0018]
On the other hand, when the continuous paper S2 is fed, as shown in FIG. 2 (b), the upper side portion of the movable guide block 23 in the paper conveyance direction is pushed down by the operation cam rod 28, and the lower side in the paper conveyance direction. The continuous paper S2 is formed on the fixed guide block 22 by causing the pull-in side guide surface 23a to sink into the fixed guide block 22 while only the side pinch roller 24 is pressed against the peripheral surface of the platen 10. The guide surfaces 22a and 22b that draw a gentle curvature are fed to the peripheral surface of the platen 10 while preventing the interlayer displacement.
[0019]
In the embodiment described above, two pinch rollers 4, 5, 23, and 24 are provided in each of the movable guide blocks 3 and 23. However, a single pinch roller is pivotally supported. Can be configured so as to be pressed and separated from the peripheral surface of the platen 10 in accordance with the feeding mode of the cut sheet and the continuous sheet.
[0020]
【The invention's effect】
As described above, according to the present invention, the paper guide member is brought into contact with and separated from the platen with the roller held according to the conveyance of the cut paper and the continuous paper, and the inclination of the guide surface on the drawing side is strongly increased. When the object to be transported is cut paper, the inclination of the guide surface on the pull-in side is increased, the curvature of the paper guide surface is increased, and the cut paper is moved to its platen due to its own weight drop. On the other hand, when the object to be conveyed is continuous paper, the inclination of the guide surface on the pull-in side is relaxed and the curvature of the paper guide surface is reduced to enable paper conveyance without causing interlayer misalignment. Thus, it is possible to easily configure an optimal paper transport path according to the type of paper by a simple operation.
[Brief description of the drawings]
FIGS. 1A and 1B show a paper feed mechanism of a printer according to an embodiment of the present invention, in which FIG. 1A shows a cut sheet conveyance state and FIG. 1B shows a continuous sheet transfer state; .
FIGS. 2A and 2B are views showing a paper feeding mechanism of a printer according to another embodiment of the present invention in the same state.
[Explanation of symbols]
3, 23 Movable guide blocks 3a, 23a Pull-in side guide surfaces 3b, 23b Delivery guide surfaces 4, 5, 24, 25 Pinch rollers 8, 28 Operation cam rod 10 Platen 11 Paper feed unit 12 Push tractor 22 Fixed guide block

Claims (4)

  A guide surface for drawing paper is formed on the upper surface on the upper side in the paper conveying direction of the paper guide member, and a delivery guide surface for feeding paper to the peripheral surface of the platen is formed on the upper surface on the lower side. Two rollers that are in contact with and away from the peripheral surface of the platen are disposed apart from each other in the paper transport direction, and the paper guide member is configured to displace the two rollers in the cut paper transport mode. In the continuous paper transport mode, the upper roller on the upper side in the transport direction is separated from the peripheral surface of the platen, and the lower roller A paper feeding mechanism for a printer, wherein the paper feeding mechanism is disposed in pressure contact with the peripheral surface of the platen and is swingably movable so that the inclination angle of the pull-in guide surface is relaxed.   An urging member that acts on the paper guide member to press the roller against the peripheral surface of the platen and an operation member that acts on the paper guide member to swing and displace the paper guide member are provided. A paper feeding mechanism for a printer according to claim 1.   The paper guide member is constituted by a fixed guide member having a pull-in guide surface with a gentle inclination angle, and a movable guide member having a pull-in guide surface having a strong inclination angle, and a roller that contacts and separates from the peripheral surface of the platen. At the same time, the movable guide member is pressed against and separated from the peripheral surface of the platen according to the transport mode of the cut paper and the continuous paper, and at the same time, the guide surface for retracting the paper guide member is A paper feeding mechanism for a printer, wherein the paper feeding mechanism is arranged to be swingable so as to be able to be inserted and removed from a guide surface for drawing in a fixed guide member.   An urging member that acts on the movable paper guide member to press the roller against the peripheral surface of the platen and an operation member that acts on the movable paper guide member to swing and displace the movable paper guide member are provided. The paper feeding mechanism for a printer according to claim 3.

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