JPH05132185A - Printing device - Google Patents

Abstract

PURPOSE:To enable a sheet jam or the like to be easily removed, and allow the application of compact design and the reduction of cost. CONSTITUTION:A pinch roller 16 is so fitted to a cover 8 as to be movable via a pinch roller separation mechanism 20 including a spring energized slide section 20S, and to come in pressure contact with a feed roller 15 upon closing the cover 8, and part therefrom upon opening the cover 8. Also, when the cover 8 is closed, a part of the slide section 20S is engaged with the recess 3 of a body frame 1, due to the force of a spring 25, thereby adjusting the position of the pinch roller 16 with the feed roller 15 and causing the engagement of the cover 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing device.

[0002]

2. Description of the Related Art FIG. 4 shows a schematic structure of a conventional printer.

In the figure, reference numeral 1 is a main body frame. A printing unit 4 (for example, a platen 5, a print head 6, a ribbon cassette 7) is provided on the main body frame 1. The print head 6 is provided so as to be movable along the platen 5 in the direction perpendicular to the plane of the drawing. Further, the ribbon cassette 7 is mounted so that the ribbon can be supplied between the platen 5 and the print head 6.

A pair of discharge side feed rollers 15 are provided at a portion of the main body frame 1 downstream of the printing section 4 in the sheet conveying direction.
The discharge side pinch roller 16 is rotatably provided in the direction of the arrow while being in pressure contact with the discharge side pinch roller 16.

More specifically, the discharge side pinch roller 16
Is provided so as to be press-contactable / separable with respect to the discharge-side feed roller 15 via a pinch roller contact / separation mechanism 30 for convenience of paper jam processing and the like. The pinch roller contact / separation mechanism 30 is rotatably supported by the main body frame 1 via a support shaft 35, and an arm 31 to which a discharge side pinch roller 16 is rotatably attached at a tip end thereof, and the arm 31 is connected to the discharge side pinch roller 16. Includes a spring 32 that biases the discharge-side feed roller 15 so as to come into contact with the discharge-side feed roller 15 at a predetermined pressure. A paper guide 39 is attached to the lower part of the arm 31.

Similarly, a feed roller 11 and a pinch roller 12 are provided on the upstream side of the printing section 4 in the sheet conveying direction so as to be rotatable in the arrow direction.

A cover 8 is attached to the body frame 1 via a support shaft 9 so as to be openable and closable. The printing unit 4 and the rollers 11, 12, 15, 16 and the like described above are
Normally, it is covered by the cover 8.

Further, the above-mentioned printing apparatus has a cover 8
A locking means is provided for locking the closed position. The locking means is the engagement member 4 provided at the tip of the cover 8.
1 and a hook member 42 provided on the body frame 1 side so as to engage with the engaging member 41 when the cover 8 is closed.

However, the paper P fed into the printing unit 4 by the feed roller 11 and the pinch roller 12 is printed in the printing unit 4 and the discharge side feed roller 15
The sheet is pinched and conveyed by the sheet ejection side pinch roller 16 and ejected to a predetermined position.

[0010]

By the way, in the above-mentioned printing apparatus, the cover 8 is locked in order to eliminate a paper jam caused by a paper jamming defect or the like on the discharge side feed roller 15 and the discharge side pinch roller 16. After releasing and releasing the locked state by means, the arm 31 of the pinch roller contact / separation mechanism 30 must be further rotated to separate the discharge side pinch roller 16 from the discharge side feed roller 15, which is troublesome. Have inconvenience.

Further, in order to meet the demand for downsizing of the present printing apparatus, it is necessary to save the installation space of each component, but in the paper jam processing etc., the discharge side pinch roller 1
In order to sufficiently separate 6 from the discharge side feed roller 15, it is necessary to secure a vast empty space for rotating the arm 31, and it is difficult to save the installation space.

In view of the above circumstances, an object of the present invention is to provide a printing apparatus which can easily treat a paper jam or the like, and can be downsized and reduced in cost.

[0013]

According to the present invention, a printing portion provided on a main body frame and a main body frame portion downstream of the printing portion in the sheet conveying direction are rotatably provided in a predetermined direction while being in pressure contact with each other. In a printing apparatus including a feed roller and a pinch roller, and a cover that is openably and closably attached to the main body frame and can cover the printing unit and the like, the cover includes the pinch roller and a spring-biased sliding unit. It is movable via a pinch roller contacting / separating mechanism that includes, is provided so as to be in pressure contact with the feed roller when the cover is closed, and to be separated from the feed roller when the cover is opened, and a part of the slide portion when the cover is closed. The pinch roller with respect to the feed roller engages with the engaging recess on the body frame side by the urging force of the spring. Characterized in that it is configured to lock the cover performs a location adjustment.

[0014]

According to the present invention, for example, when a paper jam caused by a paper jamming failure at the feed roller and the pinch roller is to be treated, the slide portion of the pinch roller contact / separation mechanism resists the urging force of the spring. Pull out from the engagement recess on the frame side and open the cover in that state.
Then, the pinch roller is separated from the feed roller in conjunction with the opening operation of the cover. As a result, the jammed paper can be easily removed from between the rollers.

When the cover is closed after the paper is jammed, a part of the slide portion is engaged with the engaging recess on the body frame side by the urging force of the spring to adjust the position of the pinch roller with respect to the feed roller. Lock the cover. Therefore, the pinch roller is positioned at a regular position and is pressed against the feed roller.

As described above, since the opening / closing operation of the cover is positively used to bring the pinch roller into and out of contact with the feed roller, it is not necessary to rotate the pinch roller using an arm or the like as in the conventional case, and handleability is improved. Can be improved. Further, it is not necessary to secure a vast empty space for rotating the pinch roller, and the installation space can be saved. Further, since the cover is locked in the closed state by using the slide portion for contacting and separating the pinch roller, the number of parts can be reduced.

As a result, it is possible to easily deal with paper jams, etc., and to reduce the size and cost.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, the printing apparatus according to the present embodiment is formed so as to be able to print single-cut sheets and continuous sheets of a plurality of sheets, and includes a main body frame 1, a printing unit 4, a cover 8, and a sheet conveying unit. Part (feed roller 11, pinch roller 1
2, discharge side feed roller 15, discharge side pinch roller 1
6) and the pinch roller contact / separation mechanism 20.

The same components as those shown in FIG. 4 are designated by the same reference numerals, and the description thereof will be omitted or simplified.

Here, the pinch roller contact / separation mechanism 20 positively utilizes the opening / closing movement of the cover 8 to expedite the ejection side pinch roller 16 for the convenience of replacement of the print head 6 and the ribbon cassette 7 or paper jam processing. Is pressed against and separated from the discharge side feed roller 15.

Specifically, the pinch roller contact / separation mechanism 20.
Is configured so that the discharge side pinch roller 16 can be moved in the directions of the arrows A and B along the surface of the cover 8, is pressed against the feed roller 15 when the cover 8 is closed, and is separated from the feed roller 15 when the cover 8 is opened. There is. In this embodiment, the pinch roller contact / separation mechanism 20 includes a slide portion 20S and a spring 25. Slide part 20S
Is composed of an access lever 21 and a pinch roller arm 22 which are slidably connected to each other in the directions of arrows A and B by bolts 8e and the like with a long hole 8a penetratingly formed in the cover 8 therebetween. At the lower end of the pinch roller arm 22 in FIG. 1, the discharge side pinch roller 16 is rotatably mounted, and an engaging convex portion 23 is formed.

The engaging projection 2 of the pinch roller arm 22
As shown in FIG. 1, when the cover 8 is rotated in the direction of the arrow D to be closed, the contact 3 comes into contact with the upper surface of the guide portion 2 provided on the body frame 1 and moves along the upper surface in that state. And is inserted into the U-shaped engagement recess 3. A state in which the shaft center of the discharge side pinch roller 16 is accurately parallel to the shaft center of the feed roller 15 due to the cooperation of the engagement convex portion 23 of the pinch roller arm 22 and the engagement concave portion 3 on the body frame 1 side. And the cover 8 is securely locked in the closed state.

As described above, by the cooperation of the engaging convex portion 23 of the pinch roller arm 22 and the engaging concave portion 3 on the body frame 1 side, the parallelism between the discharge side pinch roller 16 and the feed roller 15 is highly accurate. Come out. Therefore, both rollers 15, 1
6 makes it possible to smoothly eject the sheet without skewing it.

By the way, when a plurality of sheets of paper are sandwiched and conveyed by the feed roller 15 and the discharge side pinch roller 16, when only the feed roller 15 is driven to rotate and the discharge side pinch roller 16 is not driven, the upper and lower sheets are conveyed. Due to the difference in urging force, the uppermost spelled sheet may be peeled off from the lower spelled sheets and jam may occur.

Therefore, in this embodiment, the discharge side pinch roller 16 and the feed roller 15 are synchronously driven to rotate. More specifically, as shown in FIG. 3, a driven gear 18 is fixed to the discharge side pinch roller 16 so as to be concentric, and meshes with a drive gear 17 that is fixed concentrically with the feed roller 15. There is. The drive gear 17 (and hence the feed roller 15) is rotated in the arrow direction by a motor (not shown). Therefore, the discharge side pinch roller 16 is rotated in synchronization with the feed roller 17 via the gears 17 and 18.

Here, the sum of the radiuses of the pitch circles of the gears 17 and 18 [(d1 + d2) / 2] is the sum of the radii of the discharge side pinch roller 16 and the feed roller 15 [(D1 + D2) /, as shown in FIG. 2], that is, (D1 + D2)> (d1 +
d2)]. Incidentally, these gears 17 and 18 are also connected / disconnected at the same time when the cover 8 is opened / closed.

Next, the operation will be described.

For example, in the case of processing a paper jam caused by a paper biting failure in the discharge side feed roller 15 and the discharge side pinch roller 16, the slide portion 20S of the pinch roller contact / separation mechanism 20 is provided with a spring 25. By sliding in the direction of arrow A against the force, the engagement relationship between the engagement protrusion 23 and the engagement recess 3 on the main body frame 1 side is released, and the cover 8 is opened in this state. Then, the discharge side pinch roller 16 is separated from the discharge side feed roller 15 in conjunction with the opening operation of the cover 8. As a result, both rollers 1
It is possible to easily remove the jammed paper due to defective biting at 5, and the like.

When the cover 8 is closed after the paper jam processing, the engaging protrusion 23 of the pinch roller arm 22 is spring 25.
Of the ejection side feed roller 15 of the ejection side pinch roller 16 by engaging with the engagement concave portion 3 of the body frame 1 side by the urging force of
The position of the cover 8 is adjusted and the cover 8 is locked. Therefore, the discharge side pinch roller 16 is positioned at a regular position and is brought into pressure contact with the discharge side feed roller 15.

In this way, the opening / closing operation of the cover 8 is positively used to bring the discharge side pinch roller 16 into contact with and separate from the discharge side feed roller 15, so that the arm (31) or the like is used to rotate. It is not necessary to operate, and the handleability can be improved. In addition, the discharge side pinch roller 16
It is not necessary to provide a vast vacant space for rotating the device, and the installation space can be saved. Furthermore, since the cover 8 is locked in the closed state by using the slide portion 20S for contacting and separating the pinch roller, the number of parts can be reduced.

According to this embodiment, however, the cover 8
In addition, the discharge side pinch roller 16 is movable via the pinch roller contacting / separating mechanism 20, is in pressure contact with the discharge side feed roller 15 when the cover 8 is closed, and is separated from the discharge side feed roller 15 when the cover 8 is opened. Provided and part of the slide portion 20S (engagement protrusion 23) when the cover 8 is closed
Is configured to engage with the engagement concave portion 3 on the main body frame 1 side by the biasing force of the spring 25 to adjust the position of the discharge side pinch roller 16 with respect to the discharge side feed roller 15 and lock the cover 8. Paper jams and the like can be easily processed, and downsizing and cost reduction can be achieved.

Further, by closing the cover 8, the driven gear 18 on the discharge side pinch roller 16 side is connected to the drive gear 17 on the feed roller 15 side, and each roller 1
Since 5 and 16 can be driven to rotate synchronously, it is possible to smoothly feed a plurality of continuous sheets of paper without peeling off the respective sheets of paper.

[0033]

According to the present invention, a pinch roller can be moved on a cover via a pinch roller contact / separation mechanism including a spring-biased slide portion, and can be pressed against a feed roller when the cover is closed. The cover is provided so as to be separated from the feed roller when the cover is opened, and when the cover is closed, a part of the slide portion is engaged with the engaging recess on the main body frame side by the biasing force of the spring to adjust the position of the pinch roller with respect to the feed roller. Since the cover is locked, it is possible to easily deal with paper jams and the like, and it is possible to reduce the size and cost.

[Brief description of drawings]

FIG. 1 is a diagram showing a main part of an embodiment of the present invention.

FIG. 2 is likewise an exploded perspective view.

FIG. 3 is also a diagram for explaining a meshing positional relationship between a driven gear on the pinch roller side and a drive gear on the feed roller side.

FIG. 4 is a schematic configuration diagram of a conventional printing device.

[Explanation of symbols]

 1 Body Frame 3 Engagement Recessed Part 15 Discharge Side Feed Roller 16 Discharge Side Pinch Roller 20 Pinch Roller Contact / Separation Mechanism 20S Slide Part 23 Engagement Convex Part (Part of Slide Part) 25 Spring

Claims (1)

[Claims] 1. A printing unit provided on a main body frame, a feed roller and a pinch roller rotatably provided in a predetermined direction in a state of being in pressure contact with a main body frame portion downstream of the printing unit in the sheet conveying direction, A printing apparatus provided with a cover that can be opened and closed attached to a main body frame and can cover the printing section and the like, wherein a pinch roller contacting / separating mechanism including the cover and the pinch roller and a spring-biased slide section. Is provided so as to be movable via, and to be in pressure contact with the feed roller when the cover is closed and to be separated from the feed roller when the cover is opened, and when the cover is closed, a part of the slide portion is urged by the spring. The position of the pinch roller with respect to the feed roller is adjusted by engaging with the engaging recess on the body frame side. Printing apparatus, characterized in that it is configured to lock the cover.