JPH0624062A - Paper guide device of printer - Google Patents

Abstract

PURPOSE:To simplify a structure and operability by interlocking the contact and separation operation of a pinch roller to a platen with the changeover operation of paper feed passages used corresponding to the kinds of paper. CONSTITUTION:A contact and separation part 21 allowing a roller holder 7 holding pinch rollers 5, 6 to approach and separate with respect to a platen 2 is provided to so as to be connected to an operation part 25 and a continuous paper feed passage 10 guiding the continuous paper 9 fed from a tractor 8 to the platen 2 and a cut form feed passage 12 guiding a cut form to the platen 2 are arranged so as to be mutually inclined. The paper guide 14 having the first guide surface opposed to the continuous paper feed passage 10 and the second guide surface 18 opposed to the outer peripheral surface of the platen 2 is provided to the triangular space in the vicinity of the intersecting point of the continuous paper feed passage 10 and the cut form feed passage 12 in a freely revolvable manner so as to have the axis parallel to that of the platen 2 and the press part 26 opposed to the part separated from the revolving axis of the paper guide 14 is fixedly provided to the roller holder 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper guide device for a printer.

[0002]

2. Description of the Related Art Conventionally, when continuous paper is used, the pinch roller is moved away from the platen to convey the paper by a tractor, and when a single-cut sheet is used, the pinch roller is brought into contact with the platen to cut the single-cut sheet. There is a printer that conveys paper by friction.

Here, FIGS. 3 and 4 show a conventional example for selectively bringing a pinch roller into contact with the platen. That is, the platen 50 is rotatably provided at a fixed position, and the pinch roller 51 that comes into contact with the platen 50 by the urging force of a spring (not shown) is rotatably provided. In addition, the protrusion 5 that comes into contact with the shaft 52 of the pinch roller 51
An arm 55 having 3 and a pin 54 is biased clockwise and is rotatably held by a stud 56 parallel to the platen 50. Further, the protrusion 5 that comes into contact with the pin 54
A switching plate 59 having a groove 7 and a recess 58 is provided slidably in the linear direction. The upper end of the switching plate 59 is connected to a switching lever 61 that rotates around a support shaft 60.

The state shown in FIG. 3 is a state in which the switching lever 61 is located at the tractor feed position. In this state, the switching plate 59 is located at the highest position and the protrusion 57 presses the pin 54 of the arm 55. . That is, the arm 55 is kept rotated in the counterclockwise direction about the stud 56 and presses the shaft 52 of the pinch roller 51 upward by the protrusion 53, so that the pinch roller 51 is separated from the platen 50, and In this state, the continuous paper is conveyed by a tractor (not shown).

When using a single-cut sheet, as shown in FIG. 4, the switching lever 61 is rotated clockwise about the support shaft 60. As a result, the switching plate 59 descends, and the protrusion 57 thereof moves below the pin 54. Therefore, the arm 55 biased clockwise rotates clockwise until the pin 54 comes into contact with the recess 58, the projection 53 retracts from the shaft 52 of the pinch roller 51, and the pinch roller 51 is biased by the platen roller 51. 50 is elastically contacted.

A printer that selectively uses continuous paper and single-cut sheets is
Although not shown, the continuous paper feed path for guiding the continuous paper conveyed from the tractor and the single-cut paper feed path for guiding the single-cut sheet are provided, and both of these guide the paper to the platen. Therefore, in general, they are arranged so as to be inclined to each other, and a paper guide is rotatably provided with an axis parallel to the platen in the vicinity of the intersection of the continuous paper feeding path and the single-cut sheet feeding path to use continuous paper. In this case, the paper guide is rotated so as to face the continuous paper feed path with an optimum gap, and when using a single-cut sheet, the paper guide should have an optimum gap with respect to the outer periphery of the platen. There is a structure having a structure that opens and rotates so as to face each other.

[0007]

The present invention is not limited to those shown in FIGS. 3 and 4, but conventionally, an independent contact / separation mechanism is provided only for contacting / separating the pinch roller with respect to the platen. . Therefore, as described above, when the orientation of the paper guide is changed depending on whether the paper is fed from the continuous paper feeding path or the single-cut paper feeding path, a separate switching mechanism is required. The number of points increases, and assembly work and operability become complicated.

[0008]

SUMMARY OF THE INVENTION According to the present invention, a roller holder holding a pinch roller facing a platen is provided with a contacting / separating portion connected to an operating portion for moving the roller holder toward and away from the platen, and the roller holder is conveyed from a tractor. A continuous paper feeding path for guiding the continuous paper to the platen and a continuous paper feeding path for guiding the cut sheet to the platen, are arranged so as to be inclined to each other, and are opposed to the continuous paper feeding path. A paper guide having one guide surface and a second guide surface facing the outer peripheral surface of the platen is provided in the triangular space portion near the intersection of the continuous paper feeding path and the cut sheet feeding path. The roller holder is rotatably provided with an axis parallel to the axis, and a pressing portion facing the part of the paper guide away from the axis of rotation is fixedly provided on the roller holder.

[0009]

Operation: Depending on the usage pattern in which continuous paper is fed from the continuous paper feed path or the usage pattern in which cut sheets are fed from the single-cut paper feed path, the operation section is operated to operate the contact / separation section to pinch the roller holder. It moves toward or away from the platen with the roller,
Since the roller holder is fixedly provided with the pressing portion facing the paper guide provided in the triangular space near the intersection of the continuous paper feeding path and the single-cut sheet feeding path, the operation of one operating section can be performed to the platen. Since the pinch rollers can be brought into and out of contact with each other and the paper guides can be switched, it is not necessary to separately provide a switching mechanism for rotating the paper guides. Therefore, the number of parts can be reduced, and assembling work and It is possible to simplify the operability.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. Reference numeral 1 denotes a printer casing. A platen 2 is rotatably provided on the casing 1, and a print head 3 is mounted on a carrier (not shown) that is reciprocally driven along the platen 2. A paper pan 4 is provided below the platen 2, and a roller holder 7 that rotatably holds a plurality of pinch rollers 5 and 6 is provided inside the paper pan 4.

Next, a continuous paper feeding path 10 for guiding the continuous paper 9 (see FIG. 1) conveyed from the tractor 8 toward the outer periphery of the lower part of the platen 2 is provided substantially horizontally, and a single-cut sheet 11 is provided.
A cut sheet feeding path 12 for guiding (see FIG. 2) toward the outer periphery of the platen 2 is provided. This cut sheet feeding path 12
Has a sheet 12a that is inclined and hung with respect to the continuous paper feed path 10. The sheet 12a is formed of a film of elastic polyester or the like, and the upper portion thereof is fixed to the back surface of the guide plate 13 into which the single-cut sheet 11 is introduced.

Further, a paper guide 14 is provided in a triangular space near the intersection of the continuous paper feed path 10 and the single-cut paper feed path 12 so as to rotate about a support shaft 15. . The paper guide 14 has two arc-shaped ribs 16 that are fitted to the support shaft 15 so as to face each other, a first guide surface 17 that faces the continuous paper feed path 10, and an outer peripheral surface of the platen 2. The second guide surface 18 facing the front and the metal plate 1 for reinforcement
9 and. Further, the paper guide 14 is biased clockwise by its own weight about the support shaft 15, but in the usage mode in which the continuous paper 9 is used, as shown in FIG. The contact between the end portion and the stopper 20 causes the stopper 20 to stop at a fixed position. The stopper 20 is fixedly provided, for example, on the outer periphery of the support shaft 15 that does not rotate or on the frame in the housing 1.

Next, a contacting / separating portion 21 for contacting / separating the roller holder 7 with respect to the platen 2 is provided.
The contacting / separating portion 21 is composed of a leaf spring 23, one end of which is connected to the roller holder 7 and the other end of which is held by a column 22, and a cam 24 which supports an intermediate portion of the leaf spring 23. The cam 24 is connected to an operation lever 25 which is an operation section.
Then, a pressing portion 26 facing the portion of the paper guide 14 away from the support shaft (rotational axis) 15 and opposite to the platen 2 is formed integrally with the roller holder 7. ing.

A paper discharge roller 27, which is driven in the clockwise direction, is provided above the platen 2. The paper discharge roller 27 is provided in contact with a paper guide surface (not shown) formed on the inner surface of the cover of the housing 1, and discharges the cut sheet 11 or the continuous paper 9 sent from the platen 2. To do.

When printing is performed using the continuous paper 9 with such a configuration, as shown in FIG.
5 is located at the tractor feed position A. In this state, the pressure of the cam 24 against the leaf spring 23 is small, and the roller holder 7 is separated from the platen 2 together with the pinch rollers 5 and 6. In this state, since the pressing portion 26 is retracted downward, the paper guide 14 has the arc-shaped rib 16 as the stopper 2.
It rotates clockwise by its own weight until it contacts 0, and the first guide surface 17 faces the continuous paper feeding path 10 with an appropriate gap. Then, by driving the tractor 8,
The continuous paper 9 is guided from the continuous paper feed path 10 to the outer periphery of the platen 2.

When printing is performed using the single-cut sheet 11, the operation lever 25 is moved to the friction feed position B as shown in FIG.
Rotate to. As a result, the cam 24 interlocks with the leaf spring 23 and pushes up the roller holder 7,
The pinch rollers 5 and 6 are pressed against the platen 2. At this time, the paper guide 14 is pushed up by the pressing portion 26 and the spindle 1
It rotates counterclockwise about 5 to make the second guide surface 18 face the outer peripheral surface of the platen 2 with an optimum gap. As a result, the single-cut sheet 11 inserted in the single-cut sheet feeding path 12 is conveyed with an accurate feed amount corresponding to the rotation angle of the platen 2 without leaving the platen 2.

As described above, since the pinch rollers 5 and 6 can be brought into and out of contact with the platen 2 and the paper guide 14 can be switched by operating one operation lever 25, the paper guide 14 can be rotated. It is not necessary to separately provide a switching mechanism, and therefore, the number of parts is reduced,
Assembly work and operability can be simplified.

[0018]

As described above, according to the present invention, the continuous paper feed path is provided by connecting the contacting / separating portion for moving the roller holder holding the pinch roller to and away from the platen to the operating portion. Depending on the usage mode of feeding continuous paper from the paper or the usage mode of feeding cut sheets from the cut sheet feeding path, the operation section is operated to move the contact / separation section to move the roller holder toward or away from the platen. Since the roller holder is fixedly provided with the pressing portion facing the paper guide provided in the triangular space portion near the intersection of the continuous paper feeding path and the cut sheet feeding path, the platen can be operated by one operation section. It is possible to move the pinch roller to and from and to switch the paper guide.
As a result, there is no need to separately provide a switching mechanism for rotating the paper guide, and therefore, the number of parts can be reduced, and the assembling work and operability can be simplified.

[Brief description of drawings]

FIG. 1 is a side view showing a state of using continuous paper according to an embodiment of the present invention.

FIG. 2 is a side view showing a state in which the cut sheet is used.

FIG. 3 is a side view showing a conventional continuous paper usage pattern.

FIG. 4 is a side view showing the usage form of the single-cut form.

[Explanation of symbols]

 2 Platen 5, 6 Pinch roller 7 Roller holder 8 Tractor 9 Continuous paper 10 Continuous paper feeding path 11 Single sheet 12 Single sheet feeding path 14 Paper guide 15 Rotation axis 17 First guide surface 18 Second guide surface 21 contact / separation part 25 operation part 26 pressing part

Claims (1)

[Claims] 1. A contact / separation unit for bringing a roller holder, which holds a pinch roller facing a platen, toward and away from the platen is connected to an operation unit, and continuous paper conveyed from a tractor is transferred to the platen. The continuous paper feed path for guiding and the cut paper feed path for guiding the cut sheet to the platen are arranged so as to be inclined with respect to each other, and the first guide surface facing the continuous paper feed path and the platen are provided. A paper guide having a second guide surface facing the outer peripheral surface is provided with a shaft center parallel to the shaft center of the platen in a triangular space near the intersection of the continuous paper feed path and the cut sheet feed path. A sheet guide device for a printer, which is rotatably provided and has a pressing portion fixedly provided on the roller holder so as to face a portion of the paper guide which is separated from the rotation axis.