JPH0541885Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a lift structure for a printing head used in a serial type facsimile machine or the like.

[Conventional technology]

The print head 12 that prints on the recording paper 11 is provided with a lift lever 13 and rotatably and slidably mounted on a slide shaft 14, as shown in FIGS. 3 and 4, for example.

The print head 12 also has a solenoid 15.
When the lift lever 13 is pushed up by the head lift camshaft 16 which is driven and rotated, the lift lever 13 is lifted in a direction to increase the distance from the flat platen 17.

On the other hand, a scanner carriage 18 for reading an image of a document 21 is slidably provided on a slide shaft 14 and a slide shaft 19 provided parallel to this slide shaft 14, and is driven by a drive means (not shown) to It is adapted to move together with the print head 12 in the axial direction of slide shafts 14 and 19.

A spring 20 is provided between the scanner carriage 18 and the print head 12 to bias the lift lever 13 of the print head 12 in the direction of pressing the print head 12 against the head lift camshaft 16.

The print head 12 and the scanner carriage 18 print on the recording paper 11 and the original 21 while moving in the direction indicated by arrow A by a distance corresponding to the length of the recording paper 11 and the original 21 in the width direction.
Read the image.

When the print head 12 and the scanner carriage 18 move to the end position of the recording paper 11 or the document 21, the solenoid 15 is activated and the head lift camshaft 16 rotates, and the print head 12 is rotated accordingly. is lifted. Therefore, the print head 12 was designed to return in the direction indicated by arrow B without contacting the recording paper 11.

[Problem that the invention attempts to solve]

However, in the conventional print head lift structure described above, when the width of the document 21 whose image is to be read is larger than the width of the recording paper 11 set at that time, the scanner carriage 18 moves to the edge position of the document 21. When the printing head 12 is moved to a position where it extends beyond the recording paper 11.

Therefore, when the print head 12 returns, if the amount of floating of the recording paper 11 from the flat platen 17 due to bending or warping is greater than the lift amount a of the print head 12, the print head 12 will get caught.
The recording paper 11 tends to be damaged or jammed.

Therefore, it is not possible to set the recording paper 11 with a width smaller than the width of the document 21 to be read, resulting in a lack of flexibility. Furthermore, since it is often necessary to set the recording paper 11 with a width larger than necessary, there is a problem in that there is a lot of waste.

[Means for solving problems]

In order to solve the above problems, the print head lift structure according to the present invention is provided on a slide shaft so as to be slidable and rotatable, and prints on recording paper while moving in the axial direction of the slide shaft. Head and
a head lift camshaft which is driven by a driving means to rotate, pushes a lift lever formed on the print head to rotate the print head, and lifts the print head in a direction that increases the distance from the platen; Move in the axial direction of the slide shaft,
In a print head lift structure that is provided with a scanner carriage for reading the image of a document, the head drift camshaft is provided with a recording paper of a size smaller than the maximum size of the document that can be read by the scanner carriage. A feature is that a tapered convex portion is formed near where the end portion is located to increase the amount of lift of the printing head.

[Effect]

With the above configuration, if the width of the document whose image is to be read is larger than the width of the recording paper set at that time, the print head will protrude from the recording paper when the scanner carriage moves to the edge of the document. reach the desired position.

Next, when the scanner carriage returns, the head lift camshaft is rotated by the drive means, and the print head lift lever is pushed to lift the print head. Then, when the print head passes near the edge of recording paper smaller in size than the original, the lift lever is further pushed by the convex part formed on the head drift camshaft, and the print head returns to the normal lift amount. In addition, it will be lifted further.

Therefore, even if the recording paper is slightly bent or warped, the print head will not get caught, so it is possible to set recording paper of any width regardless of the width of the document to be read.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

A print head 32 for printing on a recording paper 31 is provided with a lift lever 33 and is rotatably and slidably mounted on a slide shaft 34, as shown in FIGS. 1 and 2, for example.

When the print head 32 rotates, the lift lever 33 is pushed up by the head lift camshaft 36, so that the print head 32 is lifted in a direction that increases the distance from the flat platen 37. ing.

A tapered convex portion 36a having a height α that increases the amount of lift of the print head 32 is formed in the head lift camshaft 36 that lifts the print head 32 near where the end of the recording paper 31 is located. There is.

In addition, the head drift camshaft 36 is driven by the driving force of a solenoid 35 serving as a driving means.
1, gear 52, and gear 53, and rotates. In the head drift camshaft 36, when the solenoid 35 is inactive, the biasing force of a spring 54 provided between the gear 52 and the housing of the solenoid 35 is applied to the head drift camshaft 36 via the gear 52 and the gear 53. is transmitted to the lift camshaft 36,
It is designed to return to its original rotation position.

On the other hand, it includes light emitting diodes 38a, 38a,
Sukiyanaki Yaritsuji 3 reads the image of the original 41
8 is a slide shaft 34 and this slide shaft 3
It is slidably provided on a slide shaft 39 provided in parallel with the print head 32, and is driven by a driving means (not shown) to move the print head 32 along with the slide shafts 34, 3.
9 in the axial direction.

A spring 40 is provided between the scanner carriage 38 and the print head 32 to bias the lift lever 33 of the print head 32 in the direction of pressing the head lift camshaft 36.

In the above configuration, the print head 32 and the scanner carriage 38 each support the recording paper 31.
While moving in the direction shown by arrow C by a distance corresponding to the length of the document 41 in the width direction, printing on the recording paper 31 and reading the image of the document 41 are performed.

When the print head 32 and the scanner carriage 38 move to the end position of the recording paper 31 or the document 41, the solenoid 35 is activated and the head lift camshaft 36 rotates, and the print head 32 is rotated accordingly. is lifted. The print head 32 then returns in the direction indicated by arrow D without contacting the recording paper 31.

By the way, for example, the size of the document 41 whose image is to be read is B4 size, and the recording paper 3 that is set is
If the size of document 1 is A4 size, the width of document 41 is larger than the width of recording paper 31.
In this case, when the scanner carriage 38 moves to the end position of the document 41, the print head 3
2 reaches a position protruding from the recording paper 31.

Next, when the scanner carriage 38 returns, the head drift camshaft 36 is rotated by the solenoid 35. By this rotation of the head drift camshaft 36, the print head 32
The lift lever 33 is pushed and the print head 32 is lifted, leaving a gap b between the print head 32 and the flat platen 37.

Eventually, the print head 32 returns and prints the recording paper 3.
1, the head lift camshaft 36 has a protrusion 36a with a height α, so the lift lever 33 is further pushed by the protrusion 36a, and the print head 32
is lifted further in addition to the normal lift amount, and the gap between the print head 32 and the flat platen 37 widens to c.

Therefore, even if the recording paper 31 is slightly bent or warped, the print head 32 will not be caught, and the recording paper 11 will not be damaged or jammed.

Therefore, the relationship between the width of the recording paper 31 and the width of the original 41 can be arbitrarily set, such as reading a B4-sized original 41 when the A4-sized recording paper 31 is set as described above. be able to.

[Effect of idea]

As described above, the print head lift structure according to the present invention includes a print head that is slidably and rotatably provided on a slide shaft and prints on recording paper while moving in the axial direction of the slide shaft, and a driving means. a head lift camshaft that rotates when driven by the print head, presses a lift lever formed on the print head to rotate the print head, and lifts the print head in a direction that increases the distance from the platen; and a slide shaft that moves together with the print head. In the print head lift structure, the print head is equipped with a scanner carriage that moves in the axial direction of the print head and reads the image of the document. This configuration has a tapered protrusion that increases the amount of lift of the print head near where the edge of the smaller size recording paper is located.

As a result, the width of the document whose image is to be read is larger than the width of the recording paper set at that time.
Moreover, even if the recording paper is slightly bent or warped, the printing head will not get caught on the recording paper.

Therefore, it is possible to set recording paper of any width regardless of the width of the document to be read, so that it is possible to increase flexibility and ease of use, and also to eliminate waste.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the present invention, in which FIG. 1 is a perspective view showing a lift structure of a printing head, and FIG. 2 is a longitudinal sectional view thereof. Third
3 and 4 show a conventional example, in which FIG. 3 is a perspective view showing a lift structure of a conventional print head, and FIG. 4 is a longitudinal sectional view thereof. 31 is a recording paper, 32 is a print head, 33 is a lift lever, 34 is a slide shaft, 35 is a solenoid (driving means), 36 is a head drift camshaft,
36a is a convex portion, 37 is a flat platen, 38 is a scanner carriage, and 41 is a document.

Claims (1)

[Scope of utility model registration request] It is installed on the slide shaft so that it can slide and rotate freely.
The print head prints on the recording paper while moving in the axial direction of the slide shaft, and the print head is rotated by being driven by a driving means, and the print head is rotated by pushing a lift lever formed on the print head. The print head lift structure is provided with a head lift camshaft that lifts in a direction to increase the distance from the platen, and a scanner carriage that moves in the axial direction of the slide shaft together with the print head and reads the image of the document. The head drift camshaft has a tapered protrusion that increases the amount of lift of the print head near the edge of recording paper that is smaller than the maximum size document that can be read by the above-mentioned scanner carriage. A print head lift structure characterized by the following: