JPH05236195A - Facsimile equipment - Google Patents

Abstract

PURPOSE:To facilitate the assembling of a print section and to make the size small by fitting a print head and a platen roller to a mount bracket so as to form a unit. CONSTITUTION:A bearing section 114 used to fit and fix a bearing 152 supporting turnably a platen roller 150 is provided to both side faces of a mount bracket 110. A support bracket 131 having a U-shaped groove 132 inserted and supported to the bearing 152 is fitted to both side faces of a print head 130. A U-shaped groove 142 is inserted and supported to the bearing 152 in an operation bracket 140 having a cam 143 in press contact with a reception part 133 of the support bracket 131. Then, the print head 130 is pressed onto the platen roller 150 by a plate spring 122 fitted to the mount bracket 110.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facsimile machine, and more particularly to the structure of a printing section of the facsimile machine.

[0002]

2. Description of the Related Art In the structure of a printing unit of this type, a printing head unit including a thermal head for printing on paper and a platen roller pressed against the printing head unit are usually used. The two members are pressed into close contact with each other and are separated from each other when the roll paper is replaced or when the paper is jammed. As a structure for performing the pressure contact and the close contact, there is a method in which one member is supported by a cover that can be opened and closed in the apparatus housing. For example, the actual exploitation Sho 62-1865
In FIGS. 1 to 4 of Japanese Patent Laid-Open No. 50, the thermal head is held by a head holding member swingably supported on the back side of the cover, and the head holding member is fitted to a dowel formed on the back side of the cover so as to project. It is urged by the mounted coil spring, so that the thermal head is pressed against the platen roller side that is fixedly supported on the apparatus body side, and when the cover is opened,
A facsimile device having a structure in which a thermal head is separated from a platen roller is disclosed.

[0003]

In the facsimile apparatus disclosed herein, since the thermal head and the platen roller are supported by different members,
There is a problem in that positioning adjustment is required to improve the close contact state between the two and the assembling work of the coil spring and the like becomes complicated, resulting in extra assembly work. Also, since the thermal head is supported by the cover, the arrangement position between them and the height of the cover are determined, which causes restrictions on the design of other components and increases the size. There is also the drawback that it will end up.

Therefore, the present invention has been made in view of the above-mentioned conventional problems or drawbacks,
It is an object of the present invention to provide a facsimile apparatus in which the printing unit can be easily assembled and the size of which can be reduced.

[0005]

In order to achieve this object, a facsimile apparatus according to the present invention comprises a print head for printing on a sheet, a platen roller which is pressed against the print head to feed the sheet, and a platen roller. A facsimile apparatus comprising a printing unit including a pressure contact unit that press-contacts the print head, wherein a mounting bracket that supports a bearing unit that supports a rotation support shaft of the platen roller and both side surfaces of the print head are mounted. A holding bracket having a U-shaped groove, wherein the U-shaped groove of the holding bracket is fitted into the bearing portion of the platen roller, and the print head and the platen roller are attached to the mounting bracket to form a unit. is there. Further, in the facsimile apparatus according to the present invention, the holding bracket is provided with a receiving portion, and the holding bracket has an abutting portion that abuts against the receiving portion, and is swingably supported by the bearing portion of the platen roller. It is provided with an operation lever which is operated to separate the print head from the platen roller against the pressure contact means. Further, in the facsimile apparatus according to the present invention, a paper guide is integrally connected to the mounting bracket.

[0006]

In the present invention, since the print head and the platen roller are attached to the attachment bracket to form a unit, the number of parts is minimized and a stacking error during assembly does not occur.

[0007]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side sectional view of a facsimile apparatus according to the present invention, FIG. 2 is an exploded perspective view of the reading unit, FIG. 3 is a front sectional view illustrating an assembling method of the reading unit, and FIG. 4 is a rear view of the reading unit. 5 is a side sectional view for explaining the operation of the reading unit, FIG. 6 is an exploded perspective view for the printing unit, and FIG. 7 is a side sectional view for explaining the operation of the printing unit.

In these drawings, a facsimile machine indicated by reference numeral 1 is a main body 2 having a facsimile function.
And a display unit 3 for displaying processing contents with the center connected by a communication line. At the top of the main body 2,
A document insertion port 11 formed between the display unit 3 and the display unit 3 is provided, and the inserted document 5 is guided by a document guide unit 12 connected to the document insertion port 11, and the end of the document guide unit 12 is guided. The document is read by the document reading unit 40 configured by the contact sensor 45 and the reading roller 41 disposed in the document, and is discharged from the document discharge port 14 formed in the housing 10.

At the center of the front surface of the main body 2, there is provided a recessed roll storage portion 15 for storing the roll 16, and the recording paper 17 of the roll 16 has a pair of recording paper guides 125 and 155. And the print head 13
0 and a platen roller 150
Is printed and discharged from the recording paper discharge port 18. Further, in the main body 2, printed boards 20, 21, a motor 22 serving as a rotation driving source for the reading roller 41 and the platen roller 150, and a power source 23 are arranged.

A display panel 31 is provided on the front surface of the display unit 3, a touch panel 32, a liquid crystal panel 33 and a printed circuit board 34 are arranged at the back of the display panel 31, and a document is provided on the rear surface. A pair of guide members 36 and 37 forming the guide portion 12 are provided, and the display portion 3 is supported by the main body portion 2 so as to be openable and closable so as to open the document insertion port 11 side around the lower end portion. , This display 3
When one of the guide members 37 is opened, the front side of the roll accommodating portion 15 is opened so that the roll 16 can be replaced.

The detailed structure of the reading unit 40 will be described below. The reading unit 40 includes a reading roller 41 and a contact sensor 4
5, the mounting bracket 50, the leaf spring 65, and the operating lever 70. The rotation support shaft 42 of the reading roller 41 has a bearing 43 having an H-cut outer peripheral surface.
The rotary drive from the motor 22 is transmitted to the rotation support shaft 42 by a gear train (not shown) to rotate the reading roller 41. On both sides of the contact sensor 45,
A substantially L-shaped holding bracket 46 having a stepped support shaft 47 and a receiving portion 48 is attached, and a tongue piece 49 is attached to the center of the back surface.

The mounting bracket 50 includes a pair of side surface portions 51.
And a connecting portion 52 that connects the both side surface portions 51. An opening 54a is formed in the center of the side surface portion 51, and as shown in detail in FIG. 5A, a bearing portion 54 having the same shape as the bearing 43 and a central axis deviated by α and a width narrower than the bearing portion 54. The support groove 53, which is a gently curved bearing groove 55 formed by the above, is provided.
7, screw holes 58 and dowels 59 are provided respectively. The connecting portion 52 has a cut-and-raised piece 6 having a gap h which is slightly larger than the thickness of the surface of the connecting portion 52 and a leaf spring 65 described later.
0 is cut and raised, and an engaging opening 61 is provided at the root of the cut and raised piece 60, and a cut and raised opening 62 is provided so as to face the cut and raised piece 60. 63 is a dowel and 64 is a slit.

The leaf spring 65 comprises a base 66 having a narrow tip 66a and an inclined pressing portion 67.
An engaging projection 68 is provided upright at the tip of 6, and a positioning hole 69 is provided in the center. The operation bracket 70 is
The operation plate 71 includes a front-side operation plate 71 and an operation lever 72 forming a side surface. The operation plate 71 is formed to have substantially the same length as the contact sensor 45, although the left half thereof is not shown. On the central lower surface of the operation lever 72, an abutting portion 73 that abuts the receiving portion 48 of the holding bracket 46, a support hole 74 formed at one end side, and a restricting piece 7 protrudingly formed at the other end side.
It is equipped with 5.

The reading section 40 is configured as described above, and the assembly method will be described below. First, as shown in FIG. 3A, the leaf spring 65 is attached to the mounting bracket 50.
The engaging projection 68 of the leaf spring 65 is obliquely inserted into the cut-and-raised opening 62 from above, and the engaging projection 68 is engaged with the engaging hole 61 of the cut-and-raised piece 60 from below, so that the positioning hole 69 is provided with the dowel 63.
Then, as shown by the chain double-dashed line in the figure, the base 66 is temporarily positioned on the connecting portion 52 of the mounting bracket 50 so as to extend in the longitudinal direction of the connecting portion 52.

At this time, since the distal end portion 66a of the base portion 66 of the leaf spring 65 is formed in a narrow width, it can be easily inserted into the cut and raised hole 62 and the leaf spring 65 temporarily placed.
Since the wide portion of the base portion 66 is placed on the connecting portion 52, it is sandwiched between the cut-and-raised piece 60 and the connecting portion 52 and placed stably. Further, the leaf spring 65 as the pressure contact means,
Since it is arranged so as to extend in the longitudinal direction of the connecting portion 52,
The space in the longitudinal direction of the contact sensor 45 can be effectively used, and a dead space does not occur as compared with the case where the contact sensor 45 is arranged in a direction orthogonal to the conventional one, and the device does not become large. ..

Next, as shown in FIG. 2B, the support shaft 47 of the holding bracket is inserted from the opening 54a of the support groove 53, inserted and held in the bearing groove 55, and is indicated by a chain double-dashed line. First, the contact sensor 45 is supported by the mounting bracket 50.
At this time, the tongue piece 49 of the contact sensor 45 is inserted into the slit 64 of the mounting bracket 50 so that the contact sensor 45 does not rotate about the support shaft 47.

Next, the rotation support shaft 42 of the reading roller 41 is positioned on the bearing portion 54, and the bearing 43 is attached to the mounting bracket 50.
From the outside of the side surface portion 51 of the rotary support shaft 4 along the axial direction.
2 and is fitted into the bearing 54, the reading roller 41 is rotatably supported on both side surfaces 51 of the mounting bracket 50 as shown in FIG.
1 is brought into close contact with the contact sensor 45. At this time, FIG.
As shown in (a), the bearing 43 fitted in the bearing portion 54.
Is fixed to the bearing portion 54 with its movement in the vertical and horizontal directions restricted, so that the contact sensor 45 is held so as to be sandwiched between the reading roller 41 and the leaf spring 65. At the same time, the leaf spring 65 also causes the base 66 to move between the cut-and-raised piece 60 and the surface of the connecting portion 52 due to the pressing force from above the contact sensor 45.
It is pinched and held.

A side surface portion 51 of a mounting bracket 50 unitized to support the contact sensor 45 and the reading roller 41.
By fitting the dowel 59 into the positioning hole 83 and screwing the screw 81 into the screw hole 58, the dowel 59 is attached and fixed to the frame 80 in the facsimile apparatus 1. Then, the contact portion 73 of the operation lever 72 is moved to the receiving portion 4 of the holding bracket 46.
8, the sleeve thrust screw 84 inserted from the mounting hole 82 of the frame 80 is inserted into the support hole 57 and the support hole 74, and is fastened with the nut 76, and the operation bracket 70 is centered on the screw 84. Support swingably.

The operation bracket 7 assembled in this way
As shown in FIG. 1, the operation plate 71 of No. 0 has an original discharge port 14
The operation plate 71 can be operated from the document discharge port 14, and the operation plate 71 functions as a document discharge guide.

As described above, the leaf spring 65, the contact sensor 45 and the reading roller 4 are attached to the mounting bracket 50.
1 is assembled by stacking from one direction, and the contact sensor 45 is held and assembled by being sandwiched by the leaf spring 65 and the reading roller 41. Therefore, the assembly can be performed only by inserting and stacking, and the assembly is extremely easy. Becomes Also, the contact sensor 4
5 and the reading roller 41 are supported by the mounting bracket 50 which is the same member, a stacking error due to assembly is eliminated, the contact between the contact sensor 45 and the reading roller 41 is improved, and reading errors are reduced.

Next, when the original 5 is jammed in the reading section 40 and is removed, the operation bracket 7 is used for removing it.
The operation of separating the contact sensor 45 from the reading roller 41 by 0 will be described. The operation plate 71 is shown in FIG.
As shown in (b), when pushed down, the operation lever 7
2 swings counterclockwise around the screw 84, and the contact portion 73 causes the receiving portion 48 of the holding bracket 46 to move to the leaf spring 65.
The support shaft 47 is moved downward along the bearing groove 55, the contact sensor 45 is separated from the reading roller 41, and the jammed document is removed from the document discharge port 14 by pressing the document document discharge port 14 downward. Is possible.

In this way, the original discharge port 14 is also used as an operation window when the original is jammed, and the jammed original is removed from this original discharge port, so that the opening / closing mechanism of the apparatus is not required. It is greatly simplified, the number of parts and the number of assembling steps can be greatly reduced, the apparatus can be downsized, and the usability can be improved. Further, the operation plate 71 can also be used as a document discharge guide, and therefore, since a new guide mechanism is not required, the number of parts can be reduced.

Next, the detailed structure of the printing unit 100 will be described. The printing unit 100 includes a mounting bracket 110, a leaf spring 122, a pair of upper and lower recording paper guides 125 and 155,
The print head 130, the operation bracket 140, and the platen roller 150 are roughly configured. The mounting bracket 110 includes a pair of both side surface portions 111 and a connecting portion 112 that connects the both side surface portions 111.
H-cut bearing 114 having 14a and mounting plate 11
5, the mounting plate 115 is provided with a guide mounting hole 116 and a mounting hole 117 to be mounted on a device frame (not shown). The connecting hole 112 has a mounting hole 1
18, 119 and a slit 120 are provided.

Leaf spring 1 having inclined pressing portion 122a
22 is screwed into the mounting hole 118. The upper recording paper guide 125 includes a mounting portion 126 and a guide portion 127 that is curved in a side view, and the mounting portion 126 has a mounting hole 119.
It is screwed to the mounting bracket 110. A holding bracket 131 having a U-shaped bearing groove 132 and a receiving portion 133 on both side surfaces of the print head 130.
However, restriction pieces 135 each having an engaging projection 136 at the tip are attached to the central portion.

The operation bracket 140 has a pair of side surface portions 141 and 146 provided with U-shaped bearing grooves 142 and 147 and cam portions 143 and 148, respectively, and the front surface portion of one side surface portion 141 is extended. An operation portion 144 is provided and forms an operation lever 141. The lower recording paper guide 155 has a guide portion 156 that is curved in the same shape as the guide portion 127 of the upper recording paper guide 125.
And a rectangular window 157 through which the platen roller 150 projects
And a pair of mounting portions 158 and 159. One mounting portion 158 is screwed into the mounting hole 116 to be mounted on the mounting bracket 110 and the other mounting portion 159.
Is attached to the frame of a device (not shown). The bearing portion 11 is attached to the rotary shaft 151 of the platen roller 150.
A bearing 152 having the same outer shape as that of No. 4 is inserted, and the rotation from the motor 22 is transmitted to the rotation shaft 151 by a gear train (not shown) to rotate the platen roller 150.

The printing unit 100 is constructed as described above, and the assembly method will be described below. First, the rotary shaft 151 of the platen roller 150 inserted through the opening 114a is positioned in the bearing 114 of the mounting bracket 110 to which the upper and lower recording paper guides 125 and 155 are attached, and the bearing 152 is inserted into the rotary shaft 151. Fittingly fixed to the bearing 114, the platen roller 150 is rotatably supported by the mounting bracket 110. Next, the U-shaped bearing groove 132 of the holding bracket 131 is inserted into the bearing 152, and the restriction piece 1
The engagement protrusion 136 of 35 is inserted into the slit 120, and the contact sensor 130 is made to face the platen roller 150 and supported by the mounting bracket 110.

Next, the cam portions 143 and 148 are brought into contact with the receiving portion 133 of the holding bracket 131, and the U-shaped bearing grooves 142 and 147 of both side surface portions 141 and 146 are inserted into the bearing 152, and the operation bracket 155 is inserted. The mounting bracket 110 is swingably supported. Finally, the pressing portion 122
The print head 130 is brought into pressure contact with the platen roller 150 by a, and the plate spring 122 is attached to the mounting bracket 110.
To install.

As described above, since the print head 130 is directly supported by the bearing 152 of the platen roller 150, a stacking error in assembly does not occur, and the print head 13 does not occur.
0 and the platen roller 150 are improved in adhesion, and printing errors are reduced. The plate spring 122, the print head 135, and the platen roller 15 are attached to the mounting bracket 110.
Since the print heads 135 are assembled by stacking them from one direction, and the print head 135 is held by the leaf spring 122 and the platen roller 150 so as to be held, the assembly can be performed only by inserting and stacking. Becomes

The operation method of the operation bracket 140 will be described below. When the recording paper 17 is set in the printing unit 100, or when the recording paper 17 is jammed in the printing unit 100, as shown in FIG. 7B, when the display unit 3 is opened, the guide unit 37 is also opened. The roll storage unit 15 opens. In this state, the operation portion 144 of the operation bracket 140
Is lifted upward in the figure, the operation bracket 140 is
The cam portion 1 swings clockwise around the bearing 152.
43 presses the receiving portion 133 upward against the leaf spring 122, moves the print head 130 upward, and separates it from the platen roller 150. In this separated state, the recording paper 1
Set 7 or clear the paper jam.

In the second embodiment of the printing portion shown in FIGS. 8 and 9, four cut-and-raised pieces 167 are cut and raised in the connecting portion 162 of the mounting bracket 160, and the cut-and-raised pieces 167 are provided.
An engaging hole 169 is provided at the root of the cut and raised portion of
On the other hand, the leaf spring 170 attached to the cut and raised piece 167 is attached.
Is composed of a base 172 and an inclined pressing portion 171, and a convex 173 is formed at the center of the base 172 and an L-shaped projection 174 is formed at the tip.

Bearing portions 161a, into which the bearings 152 are fitted, are provided on both side portions 161 of the mounting bracket 160.
A lower recording paper guide (not shown) is attached to the screw hole 163a of the attachment plate 163, and a mounting bracket is attached to a frame of an apparatus (not shown) via the screw hole 163b. The screw hole 162a of the connecting portion 162 is attached to the screw hole 162a. An upper recording paper guide (not shown) is attached.

Then, the height h ₁ of the convex portion 173 and the cut and raised piece 1
The gap h between the 67 and the connecting portion 162 is such that h ₁ > h and the length L ₁ of the base 172 and the end face of the connecting portion 162 from the cut and raised piece 16
7 is the distance L to the main body, L ₁ > L, and the horizontal projection amount l ₁ of the protrusion 174 and the distance l between the end face of the cut and raised piece 167 and the end face of the cut and raised hole 168 are: l> l ₁ respectively.

The leaf spring 170 having the above-described structure is provided with the projection 1 at the tip so as to extend in the longitudinal direction of the connecting portion 162.
74 is inserted into the cut and raised port 168 from diagonally above, and the convex portion 173 is inserted.
Is clamped between the cut-and-raised piece 167 and the surface of the connecting portion 162, and is engaged with and fixed to the engagement port 169. The leaf spring 170 is extended in the longitudinal direction of the connecting portion 162, and the mounting bracket 160
By fixing the print head 130 to the above position, the dead space in the direction perpendicular to the longitudinal direction of the print head 130 is eliminated, and the size of the printing unit can be reduced.

FIG. 10 shows another holding structure for the leaf spring 185. In this third embodiment, the cut-and-raised piece 181 is formed so as to project below the mounting bracket 180, and the protrusion 188 of the leaf spring 185 is cut and raised. Insert from diagonally below the mouth 183,
4, the positioning hole 189 is fitted in, the projection 188 is engaged in the engaging opening 182, and the base 187 is held by being sandwiched between the cut and raised piece 181 and the back surface of the mounting bracket 180. With such a configuration, it is possible to reduce the size in the height direction as compared with the second embodiment described above.

[0035]

As described above, according to the present invention, the holding bracket for holding the print head is formed with the U-shaped groove fitted in the bearing portion of the platen roller to support the bearing portion of the platen roller. A mounting bracket having a pair of side surfaces is provided, and the printing head and the platen roller are coaxially supported by the mounting bracket, and a stacking error in manufacturing and a stacking error in assembly are eliminated.
It becomes very easy to adjust the contact between the print head and the platen roller. In addition, since the U-shaped groove of the holding bracket is fitted in the bearing portion of the platen roller and the printing portion is unitized and independent, the restriction on the shape of the apparatus housing side is removed, and therefore the external appearance of the apparatus. It is possible to freely design and enhance the design value.

Further, the holding bracket is provided with a receiving portion, which has an abutting portion for abutting against the receiving portion, is fitted to the bearing portion of the platen roller, and is swingably supported, so that the pressure contact means is provided. The structure is equipped with an operation lever that separates the print head from the platen roller, and the platen roller can be swung coaxially. The size can be reduced.

[Brief description of drawings]

FIG. 1 is a side sectional view of a facsimile apparatus according to the present invention.

FIG. 2 is an exploded perspective view of a reading unit of the facsimile apparatus according to the present invention.

FIG. 3 is a front sectional view showing a method of assembling the reading unit of the facsimile apparatus according to the present invention.

FIG. 4 is a back sectional view of a reading unit of the facsimile apparatus according to the present invention.

FIG. 5 is a side sectional view showing an operating state of the reading unit of the facsimile apparatus according to the present invention.

FIG. 6 is an exploded perspective view of a printing unit of the facsimile apparatus according to the present invention.

FIG. 7 is a side sectional view showing an operating state of the printing unit of the facsimile apparatus according to the present invention.

FIG. 8 is a second part of the printing unit of the facsimile apparatus according to the present invention.
FIG. 3 is an exploded perspective view showing the embodiment of FIG.

FIG. 9 is a second part of the printing unit of the facsimile apparatus according to the present invention.
Of the embodiment, (a) is a perspective view of a main part, and (b) is a back cross-sectional view.

10A and 10B show a third embodiment of the printing unit of the facsimile apparatus according to the present invention, FIG. 10A is a perspective view of a main part, and FIG.

[Explanation of symbols]

 1 Facsimile device 5 Original document 11 Original document insertion port 14 Original document ejection port 17 Recording paper 18 Recording paper ejection port 40 Reading unit 41 Reading roller 45 Adhesion sensor 50 Mounting bracket 65 Leaf spring 70 Operation bracket 100 Printing unit 110 Mounting bracket 122 Leaf spring 130 Printing Head 140 Operation bracket 150 Platen roller 160 Mounting bracket 170 Leaf spring 180 Mounting bracket 185 Leaf spring

Claims (3)

[Claims] 1. A facsimile apparatus comprising a printing unit comprising a print head for printing on a sheet, a platen roller which is in pressure contact with the print head to feed the sheet, and a pressure contact unit which presses the platen roller and the print head into contact with each other. The platen roller includes a mounting bracket that supports a bearing portion that supports a rotation shaft of the platen roller, and a holding bracket that is attached to both side surfaces of the print head and has a U-shaped groove. And a print head and a platen roller are attached to the mounting bracket to form a unit. 2. The facsimile apparatus according to claim 1, wherein the holding bracket is provided with a receiving portion, and the receiving portion has an abutting portion that abuts against the receiving portion. A facsimile apparatus comprising an operation lever for separating the print head from the platen roller against the pressure contact means by performing the swinging operation. 3. The facsimile apparatus according to claim 1, wherein a paper guide is integrally connected to the mounting bracket.