JPH0741002A - Printing envelope for image forming unit - Google Patents

Abstract

PURPOSE:To reduce improper fixing in an electrophotographic image forming unit by decreasing the difference in the number of lapped sheets between the thickest and thinnest portions of an envelope through the reduction of difference in thickness due to the difference in the number of lapped sheets to lower than the thickness of two thickest sheets. CONSTITUTION:A front sheet 1 and back sheet 4 are folded and adhered at margins 3, 5 to paste up, and then a top flap 2 is folded to complete an envelope. The front sheet 1, back sheet 4, and the left margin 5 to paste up or top margin 2 for paste up constitute the lapped thickest part of an envelope. The thickest part is 3t: where, t: thickness of paper sheet constituting an envelope. The thinnest part of the envelope, where two sheets are lapped, is 2t in thickness. The thickest part is adjacent to the thinnest part. Thus, at the boundary, a thickness difference t exists, which corresponds to the thickness of one sheet and which is thinner than the two thickest sheets. This thickness difference is half the conventional difference, enabling the prevention of improper fixing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an envelope for printing an image forming apparatus.

[0002]

2. Description of the Related Art A conventional envelope is shown in FIGS.
As shown in (b), FIG. 11 (c), and FIG. 11 (d), the left side of the back piece 104 is connected to the right side of the front piece 101,
Of the back piece 10 which is composed of a left margin piece 105 and a lower margin piece 103 connected to the left side and the bottom side of the front piece 101, and which is connected to the upper side of the front piece 101.
4 is folded on the back side of the front piece 101, and the left margin piece 1
05 is folded and pressed against the back side of the back piece 104, and the lower margin piece 103 is folded and adhered to the back side of the back piece 104 and the left margin piece 105, and the upper envelope lid part 102 is attached to the back piece 104 and It is folded on the back side of the left margin portion 105.

At this time, the thickness of the paper forming the envelope is t
If so, the EE ′ line cross section of FIG.
As shown in (c), the frontmost piece 101, the back piece 104, the left margin portion 105, and the uppermost envelope lid portion 102, in which the four sheets of paper are folded, have the thickest portion of the envelope having a thickness of 4t.
The thinnest portion of the back piece 104 in which two sheets of paper are folded and stacked has a thickness of 2t, and the thickest portion of the envelope and the thinnest portion of the envelope are adjacent to each other. That is, there is a difference in the envelope thickness of 2t, which corresponds to two sheets of the paper thickness t forming the envelope in the adjacent portion.

Similarly, the cross section taken along the line FF 'of FIG. 11 (b) is as shown in FIG. 11 (d), four sheets of paper: a front piece 101, a back piece 104, a left margin piece 5, and a lower margin piece 103. The thickest part of the folded envelope has a thickness of 4t.
1. The thinnest part of the back piece 104 in which two sheets of paper are folded has a thickness of 2t, and the thickest part of the envelope and the thinnest part of the envelope are adjacent to each other. That is, there is a difference in the envelope thickness of 2t, which corresponds to two sheets of the paper thickness t forming the envelope in the adjacent portion.

In this specification, "right and left" means the direction in which the envelope is turned upside down, and "up and down" means the envelope conveying direction of the image forming apparatus. In addition, FIG.
11C is an enlarged sectional view taken along the line EE ′ of the upper left portion of FIG. 11B, and FIG. 11D is an enlarged sectional view taken along the line FF ′ of the lower left portion of FIG. 11B.

[0006]

[Problems to be Solved by the Invention]

[In case of electrophotographic image forming apparatus] However,
In an electrophotographic image forming apparatus, as shown in FIG. 4, when an envelope is conveyed into the image forming apparatus,
At the time of fixing, as shown in FIG. 5A, the unfixed toner 151 which has been transferred to the envelope surface before passing through the fixing device is fixed to the fixing roller 141.
The envelope is fixed on the surface of the envelope by heat from the pressure roller 142 and the pressure from the pressure roller 142. In the conventional envelope described above, the envelope is formed in the adjacent portion with respect to the maximum total thickness of the envelope of 4 t. Since there is a difference in the envelope thickness of 2t, which corresponds to two sheets of the thickness t, at the time of fixing, as shown in FIG. 5A and FIG. Since the heat from the roller 141 is not sufficiently transferred to the envelope step portion, the unfixed toner transferred to the envelope surface is not sufficiently fixed on the envelope surface even after passing through the fixing roller 141.

[In case of daisy-wheel type image forming apparatus] Further, in the daisy-wheel type image forming apparatus, when an envelope is conveyed into the image forming apparatus, a solenoid is used at the time of printing as shown in FIG. The print hammer 165 moves to the right side in the figure in conjunction with the arm 167 sucked by the 166, and presses the print head 163 on the daisy wheel 164 toward the ink ribbon 162, and the image of the print head 163 is displayed on the platen roller. Printing is carried out on the envelope conveyed between the 161 and the ink ribbon 162. In the above-mentioned conventional envelope, the envelope is formed in a portion adjacent to the maximum total thickness 4t of the envelope. Since there is a difference in envelope thickness of 2t, which corresponds to two sheets of paper thickness t,
Since the pressure from the printing head 163 is not uniformly applied on the envelope due to the envelope step portion, there is a defect that an image is not printed accurately and a density difference occurs in the image.

[Case of Wire Dot Matrix Type Image Forming Apparatus] Further, in the wire dot matrix type image forming apparatus, when the envelope is conveyed into the image forming apparatus, the image shown in FIG. As shown in 8,
The print hammer driving unit 174 in the print head 175 pushes out the print wires 173a and 173b, which pushes the ink ribbon 172, and as an aggregate of dots on the envelope conveyed between the platen roller 171 and the ink ribbon 172. In the conventional envelope described above, the envelope of 2t, which corresponds to two sheets of the paper thickness t in which the envelope is formed in the adjacent portion, is used in the conventional envelope described above. Due to the difference in thickness, there were the following drawbacks.
(1) As shown in FIG. 7, the print wire 173a
The pressure applied to the envelope via the ink ribbon 172 and the pressure applied to the envelope from the print wire 173b via the ink ribbon 172 are not uniform due to the above-mentioned envelope step portion, so that there is a density difference in the image. There was a drawback that occurred.

(2) Further, as shown in FIG.
In the thickest part of the envelope, the gap between the front end of the print head 175 and the envelope becomes extremely small, so that the ink
There is a drawback that the ribbon 172 is rubbed and an image stain is generated by the ink ribbon 172.

[In the case of a thermal transfer type image forming apparatus] Further, in the thermal transfer type image forming apparatus, when the envelope is conveyed into the image forming apparatus, the thermal head 195 is arranged at the time of printing as shown in FIG. An ink film 193 that moves to the right in the middle and applies heat-melting or heat-sublimating ink 192 to the heating element dots 194a and 194b.
Then, the ink 192 is transferred onto the envelope conveyed between the platen roller 191 and the ink film 193 by the pressing force of the thermal head 195 and the heat of the heating element dots 194a and 194b. The image as a body is printed, and in the conventional envelope described above, the maximum total thickness of the envelope is 4t, and the total thickness of the envelope is 2t, which is equivalent to two sheets of the paper thickness t. Due to the difference in envelope thickness between the envelopes, the pressure applied by the heating element dots 194a on the envelope via the ink film 193 and the pressure applied by the heating element dots 194b on the envelope via the ink film 193 are Due to the non-uniformity of the ink, the ink film 193 may not be sufficiently heated and the ink may not be accurately transferred onto the envelope. There is a drawback to occur.

[In case of ink-jet type image forming apparatus] In addition, in the ink-jet type image forming apparatus, when the envelope is conveyed into the image forming apparatus, printing is performed as shown in FIG. Nozzle 11 of head 114
2, a piezoelectric element 113 that vibrates according to a drive signal corresponding to the image pattern is arranged, and the vibration causes the ink in the print head 114 to jump out from the tip of the nozzle 112.
An image as a group of dots is printed on the envelope conveyed between the platen roller 111 and the print head 114. In the conventional envelope described above, the maximum total thickness of the envelope is 4 t. Since there is a difference in the envelope thickness of 2t, which corresponds to two sheets of the paper thickness t forming the envelope in the adjacent portion, the gap between the front end of the print head 114 and the envelope is extremely large in the thickest part of the envelope. Since the nozzle becomes narrower, the nozzle is rubbed on the envelope, which causes a defect that an image is stained with ink.

The present invention has been made to solve the above problems, and an object of the present invention is to provide an envelope for printing an image forming apparatus in which the difference in the number of stacked sheets is small.

[0013]

In order to achieve the above object, in the present invention, in an image forming apparatus printing envelope in which sheets are overlapped and formed, the difference in the thickness due to the difference in the number of overlapped sheets is It is characterized by less than two of the thickest sheets.

Further, the adjacent margin pieces and the adjacent margin pieces and the envelope lid portion are prevented from overlapping with each other, so that the difference in thickness can be reduced to less than two sheets.

In addition, the front piece and the back piece of the envelope are separated from each other, the margin piece is provided only on the back side of the envelope, and the thickness of the back piece of the envelope is smaller than the thickness of the front piece of the envelope. so,
It may be less than two sheets having the largest thickness difference.

Further, the envelope body and the margin piece are separately provided, and the thickness of the margin piece is less than 1/2 of the thickness of the envelope body, so that the difference in thickness is less than two sheets of the thickest sheet. Good.

[0017]

In the image-forming-apparatus printing envelope according to the present invention having the above-described structure, the difference in thickness due to the difference in the number of stacked sheets is set to be less than the two thickest sheets. The following effects are obtained. That is, (1) defective fixing in the electrophotographic image forming apparatus is reduced.

(2) In the daisy-wheel type image forming apparatus, image defects and image density differences are reduced.

(3) In-image density difference and image stain in the wire dot matrix type image forming apparatus are reduced.

(4) Transfer defects in the thermal transfer type image forming apparatus are reduced.

(5) Image stains are reduced in the ink jet type image forming apparatus.

The adjacent margin pieces and the adjacent margin pieces and the envelope lid portion do not overlap each other, so that the difference in thickness can be less than two sheets of the thickest sheet.

As a result, the above-mentioned actions (1) to (5)
Is obtained.

The front piece and the back piece of the envelope should be separated from each other, and the margin piece should be provided only on the back side of the envelope, and the back piece of the envelope should be thinner than the front piece of the envelope. so,
The difference in thickness can be less than two thickest sheets.

As a result, the aforementioned actions (1) to (5)
Is obtained.

Further, the envelope body and the margin piece are separately provided, and the thickness of the margin piece is less than 1/2 of the thickness of the envelope body, so that the difference in thickness is less than two sheets of the thickest sheet. can do.

As a result, the above-mentioned actions (1) to (5)
Is obtained.

[0028]

【Example】

Example 1 (a) FIG. 1 (a) through FIG. 1 (b), FIG. 1 (c), and FIG. 1 (d) are drawings that best represent the features of the present invention.
1 (a) is a development view of an envelope according to the present invention, FIG. 1 (b) is a rear view of the envelope, and FIG. 1 (c) is AA ′ of FIG. 1 (b).
The line cross-section enlarged view, FIG.1 (d) are the BB 'line cross-section enlarged views of FIG.1 (b).

In the figure, 1 is a front piece, 2 is an upper envelope lid section as an envelope lid section, 3 is a lower margin piece as a margin piece, 4 is a back piece, and 5 is a left margin piece as a margin piece. is there.

(B) The front piece 1 and the back piece 4 are the margin pieces 3, 5
Are folded and adhered, and the upper envelope lid portion 2 is folded and folded to be assembled as an envelope as shown in FIG.

At this time, the left end portion of the adjacent margin piece 3 and the lower portion of the margin piece 5 are configured not to overlap with each other. Similarly, the upper portions of the adjacent margin pieces 5 and the left end portion of the upper envelope lid portion 2 are also configured not to overlap.

As a result, assuming that the thickness of the paper sheet forming the envelope is t, the cross section taken along the line AA 'of FIG. 1 (b) is a front piece as shown in FIG. 1 (c). 1 and the back piece 4 and the left margin piece 5 or the upper envelope lid portion 2 forms a thickest part of the envelope in which a total of 3 sheets of paper are folded and the thickness is 3t. The thinnest part of the envelope in which the two pieces of paper, the piece 1 and the back piece 4, are folded has a thickness of 2t, and the thickest part of the envelope and the thinnest part of the envelope are adjacent to each other.

That is, there is a difference in the envelope thickness of t, which is one sheet which is less than two sheets of the maximum thickness of the sheets forming the envelopes in the adjacent portions. It is 1/2 of that.

Similarly, as shown in FIG. 1 (d), the cross section taken along the line BB 'of FIG. 1 (b) shows either the front piece 1, the back piece 4, the left margin piece 5, or the lower margin piece 3. On the other hand, the thinnest part of the envelope in which three sheets in total are folded is formed to have a thickness of 3t, and the thinnest part of the envelope in which two sheets of the front piece 1 and the back piece 4 are folded is thick. 2t, and the thickest part of the envelope and the thinnest part of the envelope are adjacent to each other.

That is, there is a difference in envelope thickness of t corresponding to one sheet which is less than two sheets of the maximum thickness of the sheets forming the envelope in the adjacent portion. It is 1/2 of that.

(C) Therefore, according to the image forming apparatus printing envelope of the above embodiment, the difference in thickness between the thickest portion of the envelope and the thinnest portion of the envelope can be half that of the conventional one, and the following effects can be obtained. To be

(1) It is possible to reduce fixing defects in an electrophotographic image forming apparatus.

(2) In the daisy wheel type image forming apparatus, it is possible to reduce image defects and image density differences.

(3) It is possible to reduce the density difference in the image and the image stain in the image forming apparatus of the wire dot matrix system.

(4) Transfer defects in the thermal transfer type image forming apparatus can be reduced.

(5) Image stains can be reduced in an ink jet type image forming apparatus.

(6) Since the total thickness of the envelope is thin, the fixing temperature can be lowered in the electrophotographic image forming apparatus, which enables energy saving.

(7) Since the total thickness of the envelopes is reduced, the number of envelope paper feeding sets to the image forming apparatus is increased.

(8) Since the total thickness of the envelopes is reduced, the number of envelopes ejected and stacked on the image forming apparatus is increased.

(9) Since the material area is reduced, the cost can be reduced.

(10) Since the front piece and the back piece are integrated, since the entire envelope is formed by one piece of paper, only one envelope die is required.

(11) Since the margin piece has only two side edges, the number of steps for assembling the envelope is reduced.

[Embodiment 2] (a) FIGS. 2 (a) to 2 (b) and 2 (c) are drawings showing a second embodiment of the present invention, and FIG. 2 (a) is a drawing. 2B is a developed view of the envelope according to the present invention, FIG. 2B is a rear view of the envelope, and FIG. 2C is an enlarged cross-sectional view taken along the line CC ′ of FIG. 2B.

In the figure, 1 is a front piece, 2 is an upper envelope lid portion, 3 is a lower margin piece, 4 is a back piece, 5 is a left margin piece, and 6 is a right margin piece as a margin piece. is there.

(B) The front piece 1 and the back piece 4 are the margin pieces 3,
5 and 6 are folded and adhered to each other, and the upper envelope lid portion 2 is folded to be assembled as an envelope as shown in FIG. 2B. At this time, the thickness of the paper of the back piece 4 is 1
It is thinner than the paper thickness.

Here, the thickness of the paper of the envelope front piece 1 is t,
The paper thickness of the back piece 4 is temporarily set to (2/3) t. However, the thickness of these papers is a temporary value for facilitating the description of the present invention, and does not limit the configuration of the envelope described above.

With the above construction, the cross section taken along the line CC 'of FIG. 2B shows the front piece 1, the right margin portion 6, the back piece 4, and the upper envelope lid portion 2 as shown in FIG. 2C. The thickest part of the envelope is formed by folding four sheets of paper, and the thickness is (3 + 1/3) t
In addition, the thinnest part of the envelope in which the two pieces of paper of the front piece 1 and the back piece 4 are folded has a thickness of 12/3, and the thickest part of the envelope and the thinnest part of the envelope are adjacent to each other. That is, it is less than the maximum thickness of two sheets of paper forming the envelope in the adjacent portion. There is a difference in thickness of (1 + 2/3) t corresponding to (1 + 2/3) sheets, and this difference is smaller than the difference of 2t in the conventional envelope by (1 / 3t).

(C) Therefore, according to the image forming apparatus printing envelope of the above embodiment, in addition to the effects (1) to (8) of the effect (c) of the first embodiment, the following effects are obtained. Is obtained.

(1) Since the front piece and the back piece are separate, the material can be effectively taken.

(2) Since the front piece and the back piece are separate, cheap paper can be used on the back piece side, so that the cost can be reduced.

[Embodiment 3] (a) FIGS. 3 (a) to 3 (b) and 3 (c) are drawings showing a third embodiment of the present invention, and FIG. 3 is a development view of the envelope according to the invention, FIG. 3 (b) is a rear view of the envelope, and FIG. 3 (c) is a sectional view taken along the line D-D 'of FIG. 3 (b).

In the figure, 1 is a front piece, 2 is an upper envelope lid portion, 4 is a back piece, 7 is a left side margin piece as a margin piece, 7'is a left side margin piece as a margin piece, and 8 is a margin piece. Right part as margin piece, left side margin piece, 8 '
The right margin as the margin piece is on the right side.

(B) The front piece 1 and the back piece 4 are folded and adhered to each other by the left margin pieces 7 and 7'and the right margin pieces 8 and 8'folded at the center from the inside thereof. By folding the lid portion, the envelope is assembled as shown in FIG. At this time, the paper thickness of the left and right margin pieces 7 and 8 is less than half the thickness of the paper including the front piece 1 forming the envelope body. Here, the thickness of the paper of the envelope body including the envelope front piece 1 is t,
The paper thickness of the left and right margin pieces 7 and 8 is assumed to be (1/3) t. However, the thickness of these papers is a temporary value for facilitating the description of the present invention, and does not limit the configuration of the envelope described above.

With the above structure, the cross section taken along the line D-D 'of FIG. 3B is as shown in FIG. 3C, the front piece 1, the left margin piece left side 7', the left margin piece right side 7 and the back side. A piece 4 and an upper envelope lid 2 are folded together to form the thickest part of the envelope, the thickness of which is (3 + 2/3) t, and the front piece 1 and the back piece 4 are folded together. The thinnest envelope has a thickness of 2t, and the thickest envelope and the thinnest envelope are adjacent to each other. That is,
It is less than 2 sheets (1 + 2/3) of the maximum thickness of the sheets forming the envelope in the adjacent portion (1 + 2/3)
A thickness difference of 2/3) t occurs, and this difference is smaller than the difference of 2t of the conventional envelope by (1/3) t.

(C) Therefore, according to the image forming apparatus printing envelope of the above embodiment, in addition to the effects (1) to (8) of the effect (c) of the first embodiment, the following effects are obtained. can get.

(1) Since the margin piece and the envelope body are separate bodies, the material removal is effective.

(2) Since the margin piece and the envelope body are separate bodies, since cheap paper can be used on the margin piece side, the cost can be reduced.

(3) Since the margin piece has only two side edges,
The man-hours for assembling the envelope are reduced.

[0064]

As described above, according to the image forming apparatus printing envelope of the present invention, the difference in thickness due to the difference in the number of stacked sheets is less than the two thickest sheets. Therefore, the following effects can be obtained. That is, (1) defective fixing in the electrophotographic image forming apparatus can be reduced.

(2) In the daisy-wheel type image forming apparatus, it is possible to reduce image defects and image density differences.

(3) It is possible to reduce the density difference in the image and the image stain in the image forming apparatus of the wire dot matrix system.

(4) Transfer defects in the thermal transfer type image forming apparatus can be reduced.

(5) Image stains can be reduced in an ink jet type image forming apparatus.

(6) Since the total envelope thickness is small, the fixing temperature can be lowered in the electrophotographic image forming apparatus, which enables energy saving.

(7) Since the total thickness of the envelopes is reduced, the number of envelopes fed to the image forming apparatus is increased.

(8) Since the total thickness of the envelopes is reduced, the number of envelopes ejected and stacked on the image forming apparatus is increased.

[Brief description of drawings]

1A and 1B show an envelope for printing an image forming apparatus according to a first embodiment of the present invention, where FIG. 1A is a development view of the envelope, FIG. 1B is a rear view of the envelope, and FIG. ) AA 'line sectional view,
(D) is a BB 'line sectional view of (b).

FIG. 2 shows an envelope for printing an image forming apparatus according to a second embodiment of the present invention, (a) is a development view of the same envelope, (b) is an assembled rear view of the same envelope, and (c) is (b). 9 is a sectional view taken along line CC ′ of FIG.

FIG. 3 shows an envelope for printing an image forming apparatus according to a third embodiment of the present invention, (a) is a development view of the same envelope, (b) is an assembled rear view of the same envelope, and (c) is (b). 6 is a sectional view taken along line DD ′ of FIG.

FIG. 4 is an overall cross-sectional view of an electrophotographic image forming apparatus showing an envelope conveying direction.

5A is an enlarged cross-sectional view of the fixing unit of FIG. 4, and FIG. 5B is an enlarged cross-sectional view of the front end portion of a conventional image forming apparatus printing envelope printed by an electrophotographic image forming apparatus.

FIG. 6 is an enlarged cross-sectional view of a printing unit of a daisy wheel type image forming apparatus.

FIG. 7 is an enlarged cross-sectional view of a printing portion of a wire dot matrix type image forming apparatus.

8 is a cross-sectional view when the clearance between the platen roller and the print head of FIG. 7 is small.

FIG. 9 is an enlarged cross-sectional view of a printing unit of a thermal transfer type image forming apparatus.

FIG. 10 is an enlarged cross-sectional view of a printing unit of the ink jet type image forming apparatus.

FIG. 11 relates to a conventional image forming apparatus printing envelope,
(A) is a development view of the same envelope, (b) is an assembled rear view of the same envelope, (c) is an enlarged cross-sectional view taken along line EE ′ of (b), and (d) is FF ′ of (b). FIG.

[Explanation of symbols]

 2 Upper envelope lid part (envelope lid part) 3 Lower margin piece (margin piece) 5 Left margin piece (margin piece) 6 Right margin piece (margin piece) 7, 7'Left margin piece (margin piece) 8, 8'Right margin piece (margin piece)

Claims (4)

[Claims] 1. An envelope for printing an image forming apparatus in which sheets are stacked to form a difference in thickness due to a difference in the number of stacked sheets.
An envelope for printing an image forming apparatus, which is less than two thickest sheets among the above sheets. 2. The adjacent margin pieces and the adjacent margin pieces and the envelope lid portion are prevented from overlapping with each other so that the difference in thickness is less than two sheets of the thickest sheet. Envelopes for printing image forming devices. 3. A front piece and a back piece of the envelope are separated from each other, a margin piece is provided only on the back side of the envelope, and the back piece of the envelope is thinner than the front piece of the envelope. The envelope for printing an image forming apparatus according to claim 1, wherein the difference in thickness is less than two sheets of the thickest sheet. 4. The envelope body and the margin piece are separated from each other, and the thickness of the margin piece is less than 1/2 of the thickness of the envelope body so that the difference in thickness is less than two sheets of the thickest sheet. The envelope for printing an image forming apparatus according to claim 1.