JPH06227064A - Printing device - Google Patents

Abstract

PURPOSE:To control dispersion of gaps of a platen exerting a serious effect upon a printing quality, by constituting the title device so that the rotary central axis and a stationary part are situated in the vicinity of the upper part of a normal line to an operational direction of a printing head and in parallel with a moving direction of each printing head. CONSTITUTION:In a frame unit 5 on a papper guide, the rotary central axis 5a provided on the unit 5 is supported turnably axially on a main body frame 1, similarly a hook part of a stationary lever 50 is fitted over a sationary part 5b provided on the frame unit 5 on the paper guide and fixed under an ordinary operating state. The stationary lever 50 is supported axially turnably on the main body frame 1 and energized by a stationary lever spring 51 so that the stationary part 5b of the frame unit 5 is blocked. The rotary central axis 5a and stationary part 5b are constituted so that they are on the normal line to an operational direction of a wire of a printing head and in parallel with a moving direction of the printing head, they are hard to receive reaction force at the time of printing by the printing head and exert little influence upon a platen gap in relation to a printing quality.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing apparatus, and more particularly to a paper path opening / closing mechanism of the printing apparatus.

[0002]

2. Description of the Related Art Conventionally, in a printing apparatus capable of opening and closing a paper path of this type, the lock portion and the fulcrum of the opening / closing mechanism have not been located in the vicinity of the reaction force direction of printing. It also had a drive source for the unit that opened and closed.

[0003]

Problems to be Solved by the Invention FIGS. 14, 15 and 16
FIG. 1 shows a perspective view, a left side view and a left side view showing a state in which an opening / closing unit is opened in a conventional example of a printing apparatus.

Generally, in a printing apparatus that handles paper, a paper jam is mentioned as an unavoidable problem. When a paper jam occurs, the paper path is opened to facilitate the restoration of the jam and improve the usability.

In the conventional examples shown in FIGS. 14, 15 and 16, the fulcrum 61 of the opening / closing mechanism for opening the paper path and the lock portion 62 are largely deviated from the operating direction M of the wire of the print head. The backlash of the part 62 is amplified,
The platen gap was uneven, and it took a fine adjustment and time to secure the print quality.

Further, since the unit to be opened and closed has a drive source, there is a possibility that the mechanism inside the opened unit may move due to a malfunction of the control side or a malfunction of the operator when the unit is opened. I needed it.

The present invention has been made to solve such a drawback, and an object thereof is to suppress the variation of the platen gap, which greatly affects the printing quality.

Another object is to ensure the safety around the opening / closing unit even in the event of an abnormality.

[0009]

A printer according to the present invention comprises a paper guide upper frame unit 5 including a platen 30 facing a print head, a paper feed mechanism, and a release mechanism.
A rotation center shaft 5a provided on the paper guide upper frame unit 5 and pivotally supporting the paper guide upper frame unit 5 on the printing apparatus main body, and provided on the paper guide upper frame unit 5, and A fixing part 5b for positioning the paper guide upper frame unit 5 on the main body of the printing apparatus is provided, and at least one of the rotation center shaft 5a and the fixing part 5b is near a normal line to the operating direction I of the wire of the print head. And is parallel to the moving direction of the print head.

Further, the printing apparatus of the present invention is rotatably locked to the printing apparatus main body and engages with the fixing portion 5b provided on the paper guiding upper frame unit 5 to print the paper guiding upper frame unit 5. A fixed lever 50 that is locked to the main body of the apparatus, and a release lever 35 that is rotatable about a release mechanism provided on the paper guide upper frame unit 5 and that is engageable with the fixed lever 50 when rotated. , A paper pressing spring 34 provided in the release mechanism for generating a frictional load on the recording paper 25, and a release lever 35, and the release lever 35 is provided with the fixed lever 50.
Protrusion 3 engaging with the paper pressing spring 34 before and after engaging with
5a, the release lever 35 is rotated and engaged with the fixed lever 50, and then the release lever 35 is returned to the normal position by the projection 35a and the paper pressing spring 34. Characterize.

Further, in the printing apparatus of the present invention, the release lever 35 for releasing the engagement between the upper paper guide frame unit 5 and the fixed lever 50 is rotated around the paper feed shaft 41 provided on the upper paper guide frame unit 5. It is characterized in that it is movably provided.

Further, the printing apparatus of the present invention is characterized in that it does not have a driving unit in the paper guide upper frame unit 5 which is moved to the outside without transmitting power from the outside.

Further, in the printing apparatus of the present invention, the second reduction gear 11 for transmitting the power from the outside into the paper guide upper frame unit 5 is provided with the spring member at the position where the axial distance from the paper feed gear 12 is maintained. Is pressed against the protrusion 2a of the train wheel frame 2 via the fixed plate 10.

[0014]

1 is a perspective view of a two-sheet dot printing apparatus using the present invention. This printing apparatus is composed of a frame unit, a transmission mechanism unit, a printing mechanism section, a paper guide upper frame unit 5, and other mechanism units.

As shown in the perspective view of FIG. 2, the main body frame 1
A transmission mechanism unit is provided inside the train wheel frame 2 of a frame unit including a train wheel frame 2, a guide frame 3, and a head cover 4, and a print mechanism unit is provided under the head cover 4 and a paper is provided on an opposite portion thereof. A guide upper frame unit 5 is arranged.

As shown in the exploded view and the side view of the transmission mechanism unit of FIGS. 3 and 4, the paper feed transmission wheel train 7 and the head from the reduction transmission gear 6 to each mechanism such as paper winding, paper feeding, and paper feeding. And a head transmission train wheel 8 to the ribbon feeding mechanism. As shown in the partially enlarged perspective view 5 of FIG. 4, the paper feed transmission wheel train 7 includes a fixed plate 10 rotatably installed about the first reduction gear shaft 13 and a fixed plate 10.
A paper guide upper frame unit 5 having a second reduction gear 11 rotatably fitted on a crimped shaft, which will be described later.
When the paper is closed, the paper feed gear 12 fixed to the paper feed shaft 41 on the paper guide upper frame unit 5 and the second reduction gear 1
When the tooth tip of No. 1 interferes (A portion in FIG. 5), the fixed plate 10 and the second reduction gear 11 escape in the direction of arrow B as shown by the broken line in FIG. 5 to prevent the interference of each tooth tip. Is possible. The fixed plate 10 is pressed against the projection 2a of the train wheel frame 2 by the tension of the winding belt 14 (FIG. 4) of the winding mechanism or a spring member (not shown in FIG. 5) hung on the spring hook 10a. , The space between the paper feed gear 12 and the shaft is maintained.

As shown in FIG. 6, the recording paper 25 passes from the recording paper supply section through a paper path formed between the paper guide upper frame unit 5 and the paper guide lower frame unit 45,
Passes between the printing mechanism (print head, platen 30),
The paper is guided to the paper feed mechanism in the upper frame unit 5.

This printing apparatus is provided with a movable paper outlet guide 32 which is rotatably engaged with a paper pressing roller 33 shaft 31 which will be described later in order to guide the recording paper to the paper feeding mechanism section without resistance.
When the recording paper 25 is not inserted, the paper outlet guide 32 is opened by a spring member (not shown) as shown in FIG. When the recording paper 25 is inserted and passes through the paper feed mechanism, the projection 32a of the paper exit guide 32 is pushed by the recording paper 25, and the paper exit guide 32 is closed as indicated by the broken line in the figure.

In this printing apparatus, it is possible to manually operate the release mechanism and insert the recording paper.

FIG. 8 is a side view showing the operation of the release mechanism in the paper guide upper frame unit 5.

The release mechanism includes a paper pressing roller 33, a paper pressing roller shaft 31, a paper pressing spring 34, and a release lever 35.
It is composed of Paper pressing roller 33 and paper feeding roller 40
Are pressed against each other by the spring force of the paper pressing spring 34.

The arrow B indicates the knob of the release lever 35.
When pushed in the direction, the release lever 35 rotates around the paper feed shaft 41, and the tip of the release lever 35 pushes up the paper pressing roller shaft 31 in the direction of arrow C in FIG. As a result, a gap is created between the paper feed roller 40 and the paper pressing roller 33. At this time, as shown in FIG. 9, the paper outlet guide 32 opens in the direction of arrow E in FIG. 9 according to the movement of the paper pressing roller shaft 31, but the paper outlet guide 32
The projection 32a of the above contacts the cover portion 5c of the paper guide upper frame unit 5, and maintains an appropriate opening angle with respect to the recording paper 25. Therefore, the recording paper 25 does not hit the paper pressing roller 33, and the paper feeding roller 40 and the paper pressing roller 33
It can pass through the space without resistance and exit in the direction of arrow D.

When the release lever 35 is released, the paper pressing roller 33 is pressed against the paper feeding roller 40 by the spring force of the paper pressing spring 34, and the paper can be fed. Further, the release lever 35 is pushed by the paper pressing roller shaft 31 by the paper pressing spring 34 returning the paper pressing roller shaft 31, and returns to the standby position.

As described above, this printing apparatus uses the paper feed gear 12 and the paper feed shaft 41 fixed to the paper feed gear 12 to transfer the rotational force of the motor 15 to the inside of the paper guide upper frame unit 5. Then, the paper is fed to the paper feeding mechanism section capable of selectively feeding the paper. This paper feed mechanism can use a combination of a clutch spring and a trigger electromagnet. FIG. 10 shows a perspective view of a paper feed shaft set unitized by using a clutch spring.

11 and 12 are side views showing the opening / closing operation of the upper paper guide frame unit 5. The paper guide upper frame unit 5 is opened and closed by the paper guide upper frame unit 5, the paper guide lower frame unit 45, the release lever 35, the fixing lever 50, the fixed lever spring 51, and the paper guide fixed spring 5.
It is composed of two.

In the upper paper guide frame unit 5, a rotation center shaft 5a provided in the upper paper guide frame unit 5 is rotatably supported by the main body frame 1 and fixed in the same upper paper guide frame unit 5. Fixing lever 5 on part 5b
The hook portion of 0 is engaged and is fixed in a normal operating state. The fixing lever 50 is rotatably supported by the main body frame 1, and is urged by a fixing lever spring 51 to lock the fixing portion 5b of the upper paper guide frame unit 5.

The rotation center shaft 5a and the fixed portion 5 of this mechanism
b is configured on the normal line to the operating direction I of the wire of the print head and parallel to the moving direction of the print head, and is not easily affected by the reaction force of the print head during printing. In addition, the backlash in the rotation center shaft 5a and the fixed portion 5b only directly affects the platen gap, which can be controlled by the component size.

When the release lever 35 attached to the paper guide upper frame unit 5 is pulled up in the direction of arrow F in FIG. 11, the projection 35b of the release lever 35 pushes the fixed lever 50 in the direction of arrow G, and the paper guide upper frame unit. The lock between the fixed portion 5b of 5 and the fixed lever 50 is released. In this state, when the upper paper guide frame unit 5 is pulled up in the direction of the arrow H in FIG. 11, the upper paper guide frame unit 5 rotates about 90 ° as shown by the broken line in FIG.
2) It is possible to expose the paper path formed between the paper guide lower frame unit 45.

When the upper frame unit 5 for paper guide is closed, the upper frame unit 5 is pushed down in the direction opposite to the arrow C in FIG.
Pushes the fixing lever 50 in the direction of arrow G in FIG. 11 and returns to the fixed position of the main body frame 1. The fixed lever 50 fixes the fixed portion 5b which has returned to the fixed position by the action of the fixed lever spring 51 to the normal operating state.

When the hand is released from the release lever 35, the pin 35a (FIG. 11) provided inside the release lever 35 deforms the paper pressing spring 34. Therefore, the spring force of the paper pressing spring 34 causes the release lever 35 to move. 35 returns to the original position and enters a normal standby state.

FIG. 13 shows a part of the left side view of the printing apparatus of the present invention, and the paper guide fixing spring 52 will be described.

A paper guide fixing spring 52 is stretched between the upper paper guide frame unit 5 and the triangular hole 1a of the main body frame 1 in a two-stable state.

When the upper paper guide frame unit 5 is opened and closed, the end of the paper guide fixing spring 52 on the side of the triangular hole 1a provided in the main body frame 1 moves along one side of the triangular hole 1a and moves as shown by the broken line in the figure. Since the distance L to the rotation center shaft 5a provided in the paper guide upper frame unit 5 can be made larger than that in the case where no paper guide upper frame unit 5 is provided, a large 2 stability is obtained, and the paper guide upper frame unit 5 is stable in each state when opened and closed. .

This mechanism is very convenient for restoration of a jam (removal of the recording paper) when a jam of the recording paper occurs.

[0035]

As described above, according to the present invention, the rotation center shaft 5a and the fixed portion 5b of the mechanism are normal to the wire operating direction I of the print head and parallel to the moving direction of the print head. It is configured so that it is hardly affected by the reaction force at the time of printing by the print head, and has little influence on the platen gap related to print quality.

Further, by using the existing release lever 35 and paper pressing spring 34 when opening and closing the paper guide upper frame unit 5, the number of parts and cost can be reduced, and the size of the printing apparatus can be reduced. .

Further, since this printing apparatus does not have a power source in the upper paper guide frame unit 5, the paper feed roller 4 is not opened when the upper paper guide frame unit 5 is open.
0 and the cutter mechanism that can be installed have no risk of malfunctioning, and the printing device is very safe even when the paper guide upper frame unit 5 is opened.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a printing apparatus using the present invention.

FIG. 2 is an exploded perspective view of a frame unit according to an embodiment of the present invention.

FIG. 3 is an exploded perspective view of a transmission mechanism unit according to an embodiment of the present invention.

FIG. 4 is a side view of the transmission mechanism unit according to the embodiment of the present invention.

FIG. 5 is a partially enlarged perspective view of the transmission mechanism unit according to the embodiment of the present invention.

FIG. 6 is a sectional view of a paper path according to an embodiment of the present invention.

FIG. 7 is a sectional view of a paper path according to an embodiment of the present invention.

FIG. 8 is a side view of the paper release mechanism in the embodiment of the present invention.

FIG. 9 is an enlarged view of the paper release mechanism in the embodiment of the present invention.

FIG. 10 is a perspective view of a paper feed shaft set according to an embodiment of the present invention.

FIG. 11 is a side view of the paper guide upper frame unit according to the embodiment of the present invention.

FIG. 12 is a side view of a paper guide upper frame unit according to an embodiment of the present invention.

FIG. 13 is a partially enlarged view of the left side surface in the embodiment of the present invention.

FIG. 14 is a perspective view showing an example of a printing apparatus using a conventional technique.

FIG. 15 is a left side view showing an example of a printing apparatus using a conventional technique.

FIG. 16 is a left side view showing an example of a state in which the opening / closing unit of the printing apparatus using the conventional technique is opened.

[Explanation of symbols]

 1 Main body frame 2 Wheel train frame 5 Paper guide upper frame unit 5a Rotation center shaft 5b Fixed part 25 Recording paper 30 Platen 33 Paper press roller 34 Paper press spring 35 Release lever 35a Pin 35b Projection part 40 Paper feed roller 45 Paper guide lower frame Unit 50 Fixed lever 51 Fixed lever spring

Claims (5)

[Claims] 1. A paper guide upper frame unit 5 configured to include a platen 30 facing a print head, a paper feed mechanism, and a release mechanism. The paper guide upper frame unit 5 is provided in the paper guide upper frame unit 5. A rotation center shaft 5a for rotatably supporting the paper guide upper body, and a fixing portion 5 provided on the paper guide upper frame unit 5 and for positioning the paper guide upper frame unit 5 on the printer main body.
In the printing apparatus including b, at least one of the rotation center axis 5a and the fixed portion 5b is located near a normal line to the operating direction I of the wire of the print head and is parallel to the moving direction of the print head. A printing device having the above-mentioned configuration. 2. A fixing which is rotatably locked to the printing apparatus main body and which engages with a fixing portion 5b provided on the paper guiding upper frame unit 5 to lock the paper guiding upper frame unit 5 to the printing apparatus main body. A lever 50, a release lever 35 rotatably provided on the paper guide upper frame unit 5 and engageable with the fixed lever 50 at the time of rotation, and a release lever 35 provided in the release mechanism. Is provided on the paper pressing spring 34 that causes a frictional load on the recording paper 25 and the release lever 35, and engages with the paper pressing spring 34 before and after the release lever 35 engages with the fixed lever 50. In the printing apparatus including the protrusion 35a, after rotating the release lever 35 and engaging with the fixed lever 50, the release lever 35 is returned to the normal position. 2. The printing apparatus according to claim 1, wherein the printing is performed by the projection 35a and the paper pressing spring 34. 3. A paper feed shaft 41 provided on the paper guide upper frame unit 5 is provided with a release lever 35 for releasing the engagement between the paper guide upper frame unit 5 and the fixed lever 50.
The printing apparatus according to claim 1, wherein the printing apparatus is rotatably provided. 4. The printing apparatus according to claim 1, wherein the paper guide upper frame unit 5 does not have a drive unit that moves to the outside without power transmission from the outside. 5. The second reduction gear 11 for transmitting power from the outside into the paper guide upper frame unit 5 is the paper feed gear 1
The fixing plate 1 is fixed by a spring member at a position where the axial distance from the shaft 2 is maintained.
The printing apparatus according to claim 1, wherein the printing apparatus is pressed against the protrusion 2 a of the train wheel frame 2 via 0.