JPS58217968A - Separating device - Google Patents

Abstract

PURPOSE:To prevent a separating member from deforming when a separation part is inserted and to eliminate sheet contamination due to the contamination of the separating member, by using the separating member which has curling characteristics perpendicular to a tension direction for separating a sheet after transfer from an image carrier. CONSTITUTION:When a separating and conveying part after jam processing is inserted into a photoreceptor 1, a separating belt 42-2 uses a material which has curling characteristics perpendicular to the tension direction as shown by a chained line 42-2a and curls projecting to the side of a photoreceptor 1, and the edge of the separating belt 42-2 on the engaging side with transfer paper is beveled so that the extent of engagement with the paper decreases in the conveyance direction of the paper. Therefore, even when the separating and conveying part contacts the end part of the photoreceptor 1 when inserted, the belt 42-2 is easy to move away from the photoreceptor 1 by the synergistic effect between the curling characteristics and the inclination of the edge and the belt never deforms.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a separating device for use in image forming machines such as copying machines and laser beam printers. Specifically, the present invention relates to a separating device that separates a transfer material from an image carrier such as a photoreceptor.

A copying machine will be explained below as an example.

As a method for separating paper after transfer in a copying machine or the like, there is a commonly used separation belt method. The advantage of this separation belt method is that it physically separates the transfer paper from the photoreceptor, so it is highly reliable and low cost.

However, in this separation belt method, the separation belt is stretched near the photoreceptor due to its structure, so when the separation section is opened and reset for jam removal, the separation belt tends to come into contact with the photoreceptor drum. There was a risk that the material would become deformed and hinder separation.

In addition, there is a possibility that dirt such as toner accumulated in the notch may be transferred to the paper passing side and become smudged from the edge of the paper.

SUMMARY OF THE INVENTION Therefore, the present invention aims to solve the problems of the prior art described above. That is, it is possible to prevent deformation of the separation member when inserting the separation line, and also to eliminate stains on the sheet due to dirt on the separation member.

An embodiment of the present invention will be described in detail based on FIGS. 1 to 9.

In the figure, 1 is an image carrier (hereinafter referred to as a photoreceptor), 2 is
is the transfer paper, 5 is the separation conveyance section, and the paper guide plate 8.9.10
．． 11 and paper conveyance a-ts 6 and 7. Reference numeral 4 denotes a transfer charger, which is slidable in a groove of a stay 5 that connects a side plate 6-1 on the back side of the NIII feeding section 6 and a side plate 5-2 on the front side. Moreover, the minuteliIIIm feeding section 5 is fixed on the straight slide rails 12 and 15, and the housing 40. (35) is sphidably supported. Therefore, the separating and conveying section 3 is pulled out when handling the jam, and the jammed paper can be easily handled. Also, the side plate! l
-1-5-2, a shaft 31 is rotatably attached via a bearing 49, and one end of the shaft 61 has a lever! +5 is fixed. Further, the shaft 51 is connected to the shaft 51 via the bearing 4B. Side plate 14 of fourth part 14
-1 and 14-2 are attached to rotate freely. A shaft 15 having a gear 51 fixed to one end is rotatably supported between the side plates 14-1 and 14-2. In addition, this shaft 15 has "-916-1-16-6, 16-4 which can freely rotate with respect to the shaft 15, and four-ra 16-2-16-4 which can rotate at the same time as the shirt) 15. 5 is installed.

Further, a conveyance assisting member 27 is fixed on a stay 28 that connects the side plates 14-1 and 14-2, and assists in passing the transfer paper to the next 3-knit unit. Further, a stud 25-1, which is connected to a loop of one end of the separation belt 42-1, is attached to a stud 24-1 fixed to the side plate 14-1.
A separate heald tensioner 44-1 to which a tensioner 1 is fixed, a tension pump panel 45-1, and an auxiliary row 2 arm 23 are rotatably supported. This arm 26 has a minute 1
Auxiliary roller 171 in contact with the outer circumference of 11m'-416-2
A shaft 19 that rotatably supports an equalizer 20 having a rotatably supported shaft 122 is fixed. Further, a tension spring 26 is stretched between the side plate 14-1 and the arm 260 in order to press the auxiliary four-'y17 and 22 against the outer periphery of the separation sheet 16-2. Furthermore, the separation belt 42-
The loop at the other end of 1 is hung on a stud 41-1 fixed to the side plate 14-1 and the tensioner 44P.

Tension is applied to the separation bell 42-1 by a threaded spring 45-1 stretched between the separation bell 42-1.

Further, a leaf spring 62 is fixed to the one-sided corner of the shirt 31, and one end of the leaf spring 62 is in a position to press the stay 28. Furthermore, on the side plates 3-1 and 5-2,
The positioning pin 29 when the minute #i row 2 part 140 is set and the positioning pin 60 when it is opened are fixed. Furthermore, a single tension coil panel 38 is stretched between the -m55-1 of the set lever 53 and a spring hook 59 fixed on the side plate 5-2, and is pulled in the direction to open the lever 33. Further, a stud 45 that fits into the circular arc elongated hole 14-6 of the side plate 14-2, and a member 34 that sandwiches a positioning plate 37 fixed to the housing 40 and having a length 37-1 are fixed to the lever 6'5. (See Figure 4). A knob 56 is rotatably fitted into the arm 65, and a spring press ring 47 is provided at the tip 56-1 of the knob 56, and the knob 36 is attached to the arm 3'50 surface 5'', - A compression pull panel 46 is compressed so as to come into pressure contact with the knob 2.The pointed end 56-1 of the knob '56 is inserted into the elongated hole 37-1 when set.

The setting operation of the separating four parts in the separating device having the above structure will be explained next. First of all, Figure 2 shows the amount used when dealing with jams, etc. This is a cross-sectional view showing the M open state.
- The stud part 14 is attached to the stud 43 on the lever 5'5. ! The side plate 14-1-14 is
-2 is opened to the position where it hits the positioning pin 3'30tC.
The separating and conveying section 3 can be pulled out (the pulled out state is shown in Figure 1).

Further, FIG. 3 shows a cross section of the separation and conveyance section 6 in the set state after being pushed in. Furthermore, in FIG. 4, the lever part 53
As is clear from the figure, the tip 36-1 of the knob 36 is
It is positioned by being inserted into the elongated hole 67-1 of the positioning plate 37 by tυ. At this time, the stud 43 is inserted into the arcuate long hole 14-13.
It is in a position of Fr.
A leaf spring 32 fixed on the top of the stay 28 presses down the stay 28. As a result, the minute *-- section 14 rotates to the position of the positioning bead y29, and the rotation is completed. Of course, it goes without saying that the bin 29 must be adjusted in advance so that the minute portion 14 is set in the proper position. Further, the drive of the minute S--wo 16-2@16-5 is transmitted by the gear 51, and the gear 51 meshes with the photoreceptor drive gear 52 at the time of t.
The circumferential speed of the photoreceptor is made to match the circumferential speed of the photoreceptor.

Next, separation of the transfer paper will be explained according to FIGS. 3 and 6. FIG. 6 is a perspective view showing a state in which the transfer paper is separated. In the figure, first, the image on the photoreceptor 1 is transferred by the transfer charger 4 to the paper that is conveyed by the conveyors 6 and 7 and passes between the guide plates 8 and 90. Separation bells are placed between the paper 2 and the photoreceptor 1 in the non-image areas on both the left and right ends)
Because of the presence of 42-1 and 42-2, both ends of the paper are separated from the photoreceptor 1, and the entire transfer paper is separated.

Here, FIG. 7 is a perspective view showing the positional relationship between the photoreceptor 1 and the front separation belt 42-1 and the shape of the front separation belt during insertion of the separation conveyance section 3 after jam processing. . In Figure 7, separation bell) 42-2 is 42 in the figure.
As shown in -2-a, a material having a curl characteristic in a direction perpendicular to the tension direction and a shape in which this curl is convexly curled on the photoreceptor 111I is used, and furthermore, a separation bell! As shown by 42-2-b, the nip between 42-2 and the transfer paper on the heel side is inclined such that the nip of the paper decreases in the direction of conveyance of the paper. Further, arrow 1-a indicates the rotation direction of the photoreceptor.

Here, the state of the inclination of the end surface of the separation belt is more clearly seen in FIG. is a,)4. The relationship is

That is, the end of the separation belt 42-2 is connected to the separation belt 42-2.
2 and the transfer paper 2 has an inclination that becomes smaller as it goes in the conveyance direction of the transfer paper 2. Here, a
l is the width of the lever on the upstream side in the conveyance direction, and & Liao is the width of the lever on the downstream side in the conveyance direction. Also, as a reference value, the actual dimensions of the shank width and separation belt are: +b width & = 5mm, a, -
4am, to separation/l/) Dimension width 24~25InI11
The length is 120M. The material of this separation belt is a polyester sheet (product name: My Two), with a diameter of 50 to 60 mm.
It is preferable to wrap the material around a cylinder of IyII 11 to give it a curling characteristic, and then take out a part of the material in the axial direction as shown in FIG. In addition, in FIG. 9, 53 is a core cylinder, and 54 is a polyester sheet that is a raw material.

With such a structure (separation bell), even if it is stretched close to the photoconductor, or even if it comes into contact with the end of the photoconductor when the separation conveyance section is inserted, the synergistic effect of the curl characteristic E of the slope of the edge As a result, the bell) 42-2 easily escapes in the direction away from the photoreceptor, and the bell F is no longer deformed.

Although the present embodiment has been specifically described with respect to the front side separation belt, it goes without saying that it is not limited to only the front side and can also be applied to the rear side separation belt. Furthermore, the present invention is not limited to a configuration in which the separating member is installed at both ends of the image carrier, but may be installed at the other end, for example. By using a separation member whose material has a curl property and whose edges are sloped, deformation of the belt due to interference with the photoreceptor can be avoided (instead of the slope of the edges). This effect also makes it possible to prevent stains on the paper passing side of the separation member.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the embodiment in the middle of insertion of the separation conveyance unit, Fig. 2 is a sectional view showing the separation conveyance unit in an open state, and Fig. 6 shows the set state of the separation conveyance unit and the separation state of the transfer paper. 4 is a detailed sectional view of a part of the set lever, FIG. 5 is a perspective view showing the separation conveyance unit in the Cera F state, FIG. 6 is a perspective view showing the transfer paper separation state, and FIG. 7 is a perspective view showing the separation state of the transfer paper. FIG. 8 is a perspective view showing the shape of the separation belt, FIG. 8 is a plan view showing the inclined state of the end surface of the separation belt, and FIG. 9 is a perspective view of the polyester sheet winding cylinder. In the figure, 111... fist photoreceptor, 2 fist... fist transfer paper, 38@@*@separation conveyance section, 4#ea1 transfer charger,
6/7 fist...e/conveyance row 2.8/9/10...φ
Guide plate, 16-1 to 16-4...separation roller,
42-1-42-2...e-separation belt. Applicant: Canon Co., Ltd. Color-1,4C・Warai8n

Claims (3)

[Claims] (1) A separating device having a separating member that separates a sheet image carrier after transfer, characterized in that the separating member has a curling property in a direction perpendicular to the tension direction. (2) The separating device according to claim (1), wherein the curling characteristic is convex toward the carrier. (3) The separating device according to claim (1), wherein the separating member has an inclination such that the width of the separating member and the sheet decreases as the width increases in the conveying direction of the sheet.