JPH0286473A - Paper discharging mechanism for printer - Google Patents

Abstract

PURPOSE:To enable a bail roller to be automatically separated from a paper discharging roller in conjunction with a head-up operation for separating a printing head from the platen and reduce the number of component parts by providing the bail roller with an engaging member capable of engagement with the printing head. CONSTITUTION:A bearing member 5 is moved along a support rod 4, and the movement is stopped at a position where an engaging part 6a of a printing head 6 faces an engaging protrusion 14b of an engaging member 14, followed by a head-up operation for separating the head 6 from a platen 1 by a cam or the like. Then, the engaging part 6a of the head 6 is engaged with the engaging protrusion 14b of the engaging member 14, and bail arms 10 are turned counterclockwise against a pressing force of a bail roller-pressing spring 12 concurrently with a turning operation through which the head 6 is separated from the platen 1. As a result, the bail roller 11 is separated from an automatic paper discharging roller 7.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a method for sandwiching paper inserted between a print head and a platen of a printer between an ejection roller and a bail roller that comes into contact with the ejection roller. Regarding the paper ejecting mechanism of a printer designed to eject paper.

[Conventional technology]

First, the paper ejection (jl LM) of this type of conventional printer will be explained.

A bearing member is freely supported on a support rod arranged approximately parallel to the platen of the printer.
A print head that prints on paper is mounted on the bearing member so as to face the platen.

The print head can be moved toward and away from the fiQ Braden by rotating the bearing member relative to the support rod, and by sliding the bearing member along the support rod. It is capable of reciprocating along the platen.

On the other hand, a paper ejection roller that ejects the paper inserted between the print head and the platen is rotatably disposed on the paper ejection side with respect to the platen. Further, a bail roller that pinches and discharges the paper between the paper roller and the paper roller is supported by a support arm that is swingably disposed so as to be able to move toward and away from the paper discharge roller. ,
Further, a spring serving as a biasing means for biasing the bail roller in a direction to contact the paper ejection roller is installed between the support arm and the fixed side member. A driving means such as a solenoid is interposed between the arm and the fixed member for separating the bail roller from the paper ejection roller against the pressing force of the spring.

Note that the reason why it is necessary to separate the bail roller, which pinches the paper between the paper ejection roller and ejects the paper by the rotational drive of the paper roller, from the paper ejection roller is to move the paper toward the print head. The paper feed roller of the paper ejection roller is set larger than the paper feed claw of the paper feed roller inserted between the paper feed roller and the platen to remove slack in the paper. It is necessary to remove the slack in the paper, and when the paper is inserted between the bail roller and the moeki-masu paper roller, which are in contact with each other, the load on both rollers at the time of insertion causes the paper feed roller to This is because the paper feeding pitch is disturbed, so when inserting the paper, it is necessary to separate the bail roller from the paper ejection roller to prevent the Ω load from acting on the paper.

[Problem to be solved by the invention]

However, the paper ejection mechanism of the conventional printer described above is
In order to separate the bail roller from the paper ejection roller, a driving means such as a solenoid is provided independently as described above, which makes the structure complicated and also It had the drawback of inviting the upper world.

The present invention solves the above-mentioned problems in the conventional J3 system, and performs the separation operation of the bail roller from the discharge roller by a head-up operation that moves the print head from the platen to fl1 without using any special driving means. The purpose of the present invention is to provide a paper ejecting mechanism for a printer that can be automatically performed, has a reduced number of parts, and can be manufactured at low cost.

[To solve the problem g2) In order to achieve the above-mentioned object, the present invention disposes the print head so that it can approach and separate from the platen and can move back and forth along the platen, and the print head A paper ejection roller for ejecting the paper inserted between the paper ejection roller and the platen is rotatably arranged on the paper ejection side with respect to the platen, and the paper is ejected by sandwiching the paper between the paper ejection roller and the paper ejection roller. In a paper ejection mechanism of a printer, a paper ejection mechanism of a printer is provided, wherein a bail roller is arranged so as to be able to come into contact with and be separated from the paper ejection roller, and a biasing means is provided for urging the bail roller in a direction in which it comes into contact with the paper ejection roller. , when the print head is moved away from the platen when the print head is located at a predetermined position in the extending direction of the platen, the bail roller is engaged with the print head and moves the bail roller away from the paper ejection roller. The present invention is characterized in that an engaging member is attached to the bail roller.

[For production]

According to the present invention having the above-described configuration, since the engaging member capable of engaging with the print head is attached to the bail roller, printing is performed at a position where the print head and the engaging member engage with each other. By positioning the head and separating the print head from the platen, the print head engages with the engaging member, and an operation of separating the bail roller from the waste paper roller 1n against the pressing force of the urging means is performed. done automatically.

In addition, by bringing the print head into contact with the platen in a state where the bail roller is separated from the V paper ejection roller, the engagement between the print head and the engagement member is released, and the bail roller is biased. The sheet is automatically brought into contact with the paper ejection roller by the pressing force of the means.

〔Example〕

The present invention will be explained below with reference to embodiments shown in the drawings.

1 to 3 show an embodiment of the paper ejecting mechanism of a printer according to the present invention, and in FIGS. 1 and 2, reference numeral 1 designates a flat platen that extends long in the direction perpendicular to the plane of the paper. The platen 1 is attached to a frame 3, which is a stationary member, via a platen mount 2. Further, a support rod 4 is attached to the frame 3 so as to be substantially parallel to the longitudinal direction of the platen 1, and a bearing member 5 is supported on the support rod 4 so as to be slidable and rotatable in the axial direction. has been done. A print head 6 formed in a plate shape is attached to the bearing member 5 so as to face the platen 1.
, by the action of a driving means such as a cam (not shown)
By rotating as shown in , it is possible to approach and separate from the platen 1.

A plurality of paper ejection rollers 7゜7... for ejecting the paper P inserted between the print head 6 and the platen 1,
The rotating shaft 7a is disposed on the paper P discharge side with respect to the platen 1 (above the platen 1 in FIG. 1) and is mounted at appropriate intervals on a rotating shaft 7a that is pivotally supported by the frame 3 so as to be substantially parallel to the platen 1. It is being This rotating shaft 7a is rotatably driven by a motor 8, which will be described later.

Further, bail arms 10, 10 each having a hollow L-shape are rotatably supported at both ends of the support rod 4. Between the pair of bail arms 10.10, there are provided a plurality of bail rollers 11 spaced apart from each other and in contact with the stock roller 7 at a position near the top of the contact portion of the print head 6 with the platen 1. A supporting rotating shaft 11a is installed. Each bail roller 11 can be moved toward and away from the stock roller 7 by rotating the bail arm 10 about the support rod 4 in the direction of arrow Δ in FIG. Furthermore, a bail roller pressure contact spring 12 is installed between the bail arm 10 and the frame 3, which is a fixed side member, and is a biasing means that always biases the bail roller 11 in the direction of contacting the paper ejection roller 7. There is.

A bin 13 is passed through the rotating shaft 11a of the bail roller 11, and a base 14a having a U-shaped cross section is oscillated in the axial direction of the bail roller 11 through the bin 13. Engagement member 1 movably supported
4 is installed. Further, the base portion 14a of the engaging member 14 is provided with an engaging protrusion 14b that projects downward. On the other hand, an upper end portion of the print head 6 is provided with a ring that rotates counterclockwise in FIG. 1 to separate the print head 6 from the platen 1 when the print head 6 is at a predetermined position on the support rod 4. An engaging portion 6a is formed that can come into contact with the engaging protrusion 14b during movement.

With respect to the platen 1, the upstream side (first
Diagonally below the platen 1 in the figure), there is a rubber paper feed row 515 extending substantially parallel to the longitudinal direction of the platen 1.
is attached to the frame 3 so that it can be rotated around its support shaft 15a. The support shaft 15a of this paper feed roller 15 is connected to gears 16, 17, 18, 19.2.
The feed roller 15 is connected to the motor 8 through the 0° 21, so that the paper feed roller 15 can be rotated by the motor 8. Further, the gear 16 is fixed to the support shaft 15a, and the south 11116 of the gear 16 is meshed with a gear 23 fixed to the rotating shaft 7a of the paper discharge roller 7 via an idle gear 22. Roller 7 is paper feed row 51
It can be rotated by a motor 8 so as to rotate at the same speed as 5.

Below the paper feed roller 15, a small roller 25°26.27 made of three pieces of wood is rotatably supported by a frame 24 that can come into contact with and separate from the lower outer periphery of the paper feed roller 15. ing. A rubber belt 28 is wound around the outer periphery of these small rollers 25, 26, 27 so as to be able to run, and is brought into contact with the lower outer periphery of the paper feed roller 15. The rubber belt 28 is always pressed toward the lower outer periphery of the paper feed roller 15 by a rubber belt pressure contact spring 29 that is compressed between the frame body 24 and the floor of the frame 3. Further, a paper guide 30 is provided that extends obliquely upward from the lower outer periphery of the paper feed row 515 in a direction opposite to the platen 1 . The rubber belt 28 is brought into contact with the paper feed roller 15 through a window 31 formed in the paper guide 30.

Next, the operation of this embodiment having the above-described configuration will be explained.

As shown in FIG.
is moved, and the engaging portion 6a of the print head 6 engages with the engaging member 1.
Bearing member 5 at a position facing engagement protrusion 14b of No. 4
, and a head-up operation is performed in which the print head 6 is separated from the platen 1 by a cam or the like. Then,
The engagement portion 6a of the print head 6 is connected to the engagement protrusion 1 of the engagement member 14.
4b, and as the print head 6 moves away from the platen 1, the bail arm 10 is rotated counterclockwise against the pressing force of the bail roller pressure contact spring 12. As shown in Figure 2, the veil row 5
11 is automatically separated from the paper ejection roller 7.

On the other hand, when the head-up state of the print head 6 is released from the state in which the engagement portion 6a and the engagement protrusion 14b are engaged and the bail roller 11 is separated from the paper ejection roller 7 as described above, the above-mentioned printing The head 6 is rotated in the direction of contacting the platen 1, and the bail arm 10 is rotated clockwise by the pressing force of the bail roller pressure contact spring 12, as shown in FIG. 11 is brought into pressure contact with the paper discharge roller 7.

Note that in order to raise only the print head 6 without separating the bail roller 11 from the paper ejection roller 7, the print head 6 is moved along the support rod 4, and the print head 6 is moved up from the engagement member 14. The print head 6 may be moved head-up while not facing the print head.

As described above, according to this embodiment, the engaging portion 6a and the engaging protrusion 1
4b, the bail roller 11 can be automatically separated from the paper discharge roller 7 by raising the print head 6. Further, in this embodiment, since the engaging member 14 is swingable in the axial direction of the bail roller 11, the print head 6 is moved along the support rod 4 in the head-up state, and the print head 6 is moved along the support rod 4 in the head-up state. The engaging portion 6a is the engaging protrusion 14 of the engaging member 14.
Even when the engagement member 68 or the engagement protrusion 14b is abutted, the engagement member 14 is swung and damage to the engagement member 68 or the engagement protrusion 14b can be prevented.

Note that the present invention is not limited to the embodiments described above, and various changes can be made as necessary.

〔Effect of the invention〕

As explained above, according to the present invention, the print head is automatically moved in conjunction with the head-up operation to separate the print head from the platen, without using any special driving means for separating the bail roller from the paper ejection roller. The bail roller can be separated from the paper discharge roller, and the number of parts can be reduced and manufacturing can be achieved at low cost.

2 and 2 are side views showing different states of this embodiment, and FIG. 3 is a plan view of the main parts of this embodiment.

DESCRIPTION OF SYMBOLS 1...Platen, 4...Support rotor, 6...Print head, 6a...Engagement part, 7...Ejection roller, 10
... Bale arm, 11... Bale roller, 12.
...Bale roller pressure contact spring, 14...Engagement member, 1
4b...Engaging protrusion.

Claims (1)

[Claims] A print head is disposed so as to be able to move toward and away from the platen and to be able to move back and forth along the platen, and a paper ejection roller that discharges paper inserted between the print head and the platen is arranged relative to the platen. A bail roller is rotatably disposed on the paper ejection side, and is configured to sandwich and eject the paper between the paper ejection roller. In a paper ejection mechanism of a printer, which is provided with a biasing means for urging a roller in a direction in which it comes into contact with the paper ejection roller, when the print head is located at a predetermined position in the extending direction of the platen. A paper ejection mechanism for a printer, characterized in that the bail roller is provided with an engaging member that is engaged with the print head and separates the bail roller from the paper ejection roller when the print head is separated from the platen. .