JPH11180577A - Energizing force applying mechanism adjustable in the energizing force, and image forming device provided therewith - Google Patents

Abstract

PROBLEM TO BE SOLVED: To adjust an energizing force applying mechanism such that its elastic body produces an optimum energizing force with no use of a measuring device. SOLUTION: An energizing force applying mechanism 60 comprises a movable energizing body 64 situated at one end of an elastic body 63 to energize a body 4 in one direction by the resiliency of the elastic body 63, a movable body 62 situated at the other end of the elastic body 63 for reciprocation with respect to the energizing body 64, an interval adjusting means 66 for moving the movable body 62 to adjust the interval between the energizing body 64 and movable body 62, and a stop-position indicating mark 61a indicative of the movement stop position of the movable body 62 for a preset interval held between the energizing body 64 and movable body 62. The movable body 62 is thus freely conformed to the stop-position indicating mark 61a to produce an optimum energizing force without any measuring device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an urging mechanism for adjusting the elasticity of an elastic body to adjust an urging force applied to an energized member to a predetermined urging force. The present invention relates to a sheet separation accuracy provided in a sheet separation unit or an optical path unit of an image forming apparatus such as an image forming apparatus for separating stacked sheets of the image forming apparatus one by one, and an urging force applying mechanism for improving image forming accuracy.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 10, an urging force applying mechanism 1 is incorporated in, for example, a document separation section of an automatic document feeder, and is fed out of a sheet mounting table 3 by a pickup roller 2. Sheet S (urged body)
In cooperation with the separation roller (biased member) 4, the sheet is separated into one sheet S by Duplo separation, and the sheet can be sent to the conveyance roller 5.

The urging force applying mechanism 1 includes a separation pad base 8 and an adjustment piece 9 which are urged in a direction away from each other by a compression spring 7 and housed in a housing 6. The separation pad base 8 is pressed (biased) toward the separation roller 4 by the compression spring 7, and presses the sheet S against the separation roller 4 via the separation pad 10 on the separation pad base 8. If the pressing force is weak, a plurality of sheets are simultaneously fed to the transport roller 5 in an overlapping state. Conversely, if the pressing force is strong, it becomes difficult for the sheet to enter between the separation roller 4 and the separation pad 10.

For this reason, the adjusting piece 9 is moved by the adjusting screw 11 screwed into the housing 6 and the elasticity of the compression spring 7 is adjusted, so that only one sheet can be surely conveyed to the conveying roller 5. ing.

Further, an urging force applying mechanism 20 shown in FIG.
Is an optical wire that is incorporated in the optical path of the reading device and irradiates a light source and a mirror for reciprocating a light source and a mirror for irradiating light to a sheet as an original and transmitting the reflected light to a photoelectric conversion device. An appropriate tensile force is applied to 21 so that the light source and the mirror can move smoothly and reliably.

The urging force applying mechanism 20 includes a bracket 2
An appropriate tension (biasing force) is applied to the optical wire 21 by a tension spring 25 provided between the adjustment body 24 screwed to the upper adjustment screw 23 and one end of the optical wire 21. If the pulling force is weak, an error occurs in the movement of the light source and the mirror, and accurate image formation cannot be performed. Conversely, if the pulling force is too strong, the movement between the light source and the mirror becomes heavy, preventing smooth reciprocating movement, and similarly preventing accurate image processing.

For this reason, the adjusting piece 2 is adjusted by the adjusting screw 23.
4 is adjusted to adjust the elasticity of the tension spring 25 so that an appropriate tension is applied to the optical wire 21.

[0008]

However, when the above-mentioned urging force applying mechanism is incorporated in an image forming apparatus, the elasticity and length of a compression spring or a tension spring are measured by a spring balance or a length measuring device. The optimal pressing force or tensile force is measured by a measuring device so as to apply to the sheet, the separating roller, or the optical wire.

As described above, since the above-mentioned urging force applying mechanism adjusts the pressing force and the tensile force of the spring using the measuring device,
There is a problem that adjustment requires time.

The size of the image forming apparatus is reduced,
Since the internal space is narrow, it is difficult to measure the length of the spring using a measuring instrument, and there is also a problem that accurate length measurement cannot be performed.

Further, there is a similar problem in readjustment when a change occurs in the pressing force or the tensile force due to the wear of the separation pad or the elongation of the optical wire caused by using the image forming apparatus for a long time. .

In view of the above problems, an object of the present invention is to provide an urging force applying mechanism capable of adjusting an elastic body to an optimum urging force without using a measuring instrument.

[0013]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides an urging force applying mechanism capable of adjusting an urging force of an elastic body applied to an energized body. A movable urging body positioned at one end of the body for urging the biased body in one direction by the elastic force of the elastic body, and a movable urging body positioned at the other end of the elastic body, approaching and separating from the urging body A movable body, an interval adjusting means for moving the movable body to adjust an interval between the urging body and the moving body, and setting an interval between the urging body and the moving body to a predetermined interval. A stop position designating unit for designating a movement stop position of the moving body.

[0014] Further, the invention is characterized in that the stop position designating section is provided on the urging body.

Further, in an urging force applying mechanism capable of adjusting an urging force of an elastic body applied to the energized body, the energized body is located at one end of the elastic body, and the energized body is moved by the elastic force of the elastic body. A movable urging body for urging in the direction, a moving body positioned at the other end of the elastic body and capable of approaching and separating from the urging body, and moving the moving body to move the urging body and the urging body. A distance adjusting means for adjusting a distance between the moving body and an optical distance measuring means provided on the urging body and the moving body for measuring a distance between the urging body and the moving body. And

Further, the biased body is a sheet separating roller, the elastic body is a compression spring, the biasing body is a separation pad base having a separation pad, and the gap adjusting means is provided on a fixed object. It is characterized in that it is a set screw.

Further, the biased body may be a cable body for moving a mirror, the elastic body may be a tension spring, and the gap adjusting means may be a screw provided on a fixed object.

Further, the biased body is a sheet separating roller, the elastic body is a compression spring, the biasing body is a separation pad base having a separation pad, and the interval adjusting means is provided on a fixed object. The image forming apparatus further includes a biasing force applying mechanism in the form of a screw provided in the sheet separating section of the image forming apparatus.

Further, an urging force applying mechanism in which the biased body is a cable body for moving a mirror, the elastic body is a tension spring, and the gap adjusting means is a screw provided on a fixed object, The optical path unit of the image forming apparatus is provided.

[Operation] Based on the above structure, when the moving body is moved by the distance adjusting means and stopped in accordance with the stop position designating section, the distance between the moving body and the urging body becomes a predetermined distance, and the moving body moves. The length of the elastic body interposed between the body and the urging body is adjusted to a predetermined length.

Thus, when assembling the urging force applying mechanism,
Alternatively, at the time of the first use, the biasing force on the biased body can be adjusted to the optimal biasing force without using the measuring device.

When the urging force applying mechanism is used for a long period of time, the urging body and the urging body are worn, and the urging body expands and contracts. Let me do. In this case, if the stop position designation unit is provided on the fixed object, the relative positional relationship between the urging body and the stop position designation unit changes, and even if the moving body is aligned with the stop position designation unit, There is a possibility that the distance between the moving body and the elastic body may not be the predetermined distance, and the elastic body may not have a predetermined length.

Therefore, if the stop position designating section is provided on the biasing body, the stop position designating section moves integrally with the biasing body even if the biasing body moves, and the stop position designating section moves relative to the stop position designating section. There is no change in the positional relationship, and the interval between the urging body and the moving body can be readjusted to a predetermined interval.

Thus, the biasing force applying mechanism can be readjusted so that an appropriate biasing force can be applied to the biased body without using the measuring device even when the mechanism is used for a long time. Can be.

An optical distance measuring means provided between the urging body and the moving body measures an interval between the urging body and the moving body. The optical distance measuring means is provided beforehand between the urging body and the moving body. For this reason, the distance between the biasing body and the moving body is measured without using the measuring device used conventionally, and the distance is adjusted to a predetermined distance by the distance adjusting means, thereby reducing the elasticity of the elastic body. With a predetermined elasticity, an appropriate biasing force can be applied to the biased body.

Further, the biased body is a sheet separating roller, the elastic body is a compression spring, the biasing body is a separation pad base having a separation pad, and the distance adjusting means is provided on a fixed object. By adjusting the distance between the moving body and the separation pad to a predetermined distance without using a measuring instrument by rotating the screw and aligning the moving body with the stop position designating section, The elasticity of the compression spring between the body and the separating pad is adjusted.

Thus, the pressing force of the separation pad against the sheet separating roller can be adjusted to the optimum pressing force, and the sheets are surely separated one by one.

Further, the biased body is a cable body for moving a mirror or the like, the elastic body is a tension spring, and the gap adjusting means is a screw provided on a fixed object, and the screw is rotated. When the moving body is aligned with the stop position designating section, the distance between the moving body and the urging body can be adjusted to a predetermined distance without using a measuring instrument, and the distance between the moving body and the urging body can be adjusted. Of the tension spring is adjusted to a predetermined elasticity.

Thus, the tension on the cord can be adjusted to a predetermined optimal tension, and the mirror and the like can be moved smoothly.

Further, the biased body is a sheet separating roller, the elastic body is a compression spring, the biasing body is a separation pad base having a separation pad, and the gap adjusting means is provided on a fixed object. When a biasing force applying mechanism in the form of a screw is provided in the sheet separating section of the image forming apparatus, the biasing force of the separation pad base with respect to the sheet separating roller is adjusted to a predetermined optimal biasing force by rotating the screw. Can be adjusted.

Thus, the sheet separation roller and the separation pad surely separate the sheets fed between them one by one, thereby improving the sheet separation accuracy of the image forming apparatus.

[0032] Further, an urging force applying mechanism in which the biased body is a cable rest for moving a mirror, the elastic body is a tension spring, and the gap adjusting means is a screw provided on a fixed object is provided. When provided in the optical path of the forming device, the elasticity of the tension spring is adjusted between the moving body and the biasing body to a predetermined optimal elasticity by rotating the screw. Thereby, the mirror and the like move smoothly, and the image forming accuracy of the image forming apparatus is improved.

[0033]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS.

There are five embodiments of the urging force applying mechanism according to the present invention. An image forming apparatus in which the urging force applying mechanism of the five embodiments is incorporated, specifically, an original reading apparatus 30 with automatic original feeding is provided. A description will be given based on FIG.

Sheets S, which are a plurality of originals, mounted on the sheet mounting table 3 of the image forming apparatus (original reading apparatus) # 0
Is the urging force applying mechanism 60 by the pickup roller 2.
The sheet is conveyed between the separation pad 65 of (70, 80) and the separation roller 4 and separated one by one. The sheets separated one by one are fed by conveying rollers 31, 32, and 33, are skewed by registration rollers 34, are sent to a reading unit 35, and are read, and then are read by conveying rollers 36, 33.
The paper is discharged to a discharge sheet tray 38 by 37.

The sheets in the flow reading unit 39 and the scan reading unit 40 are the first optical scanning optical unit.
It is illuminated by an illumination lamp 42 provided on a mirror base 41. The reflected light is reflected by a first mirror 43 similarly arranged on a first mirror base 41 to a second mirror 45 and a third mirror 46 on a second mirror base 44, and collected by a lens 47. An image is formed by a CCD sensor 48 as a reading element.

The first mirror base 41 and the second mirror base 44 are
It is supported by a rail (not shown) and moves in the direction of the arrow with the rotation of the optical motor 49.
The optical motor 49 is a stepping motor, and the first mirror base is controlled by the pulleys 50, 51, 52 and the optical wire 21 as a cord so that the optical path length from the sheet glass surface 53 to the CCD sensor 48 is always constant. 41, driving the second mirror base 44; The signal sent to the CCD sensor 48 is converted into image data by an image processing circuit (not shown) and sent to a printer unit (not shown). Note that the cord also has a "string".

As shown in FIG. 9, one end of the optical wire 21 is fixed to the sensor box 54, and the intermediate portion is the pulley 50, the fixed pulley 52, the optical motor 49, and the fixed pulley 51 on the second mirror base 44 in this order. After being wound, pulley 5
0, and is connected to the urging force applying mechanism 90 (100).
A constant tension is applied to the optical wire 21. When the optical motor 49 is driven, the first motor connected to the optical wire 21
The mirror base 41 can move by twice the moving distance of the second mirror base 44.

The urging force applying mechanism 60 according to the first embodiment will be described with reference to FIGS.

As shown in FIG. 1, the biasing force applying mechanism 60 accommodates a bottomed cylindrical adjustment piece 62 which is a movable body in a bottomed cylindrical housing 61 which is a fixed object. The adjustment piece 62 has a configuration in which a compression spring 63 as an elastic body and a separation pad base 64 as an urging body are housed. A separation pad 65 is attached to a tip of the separation pad base 64. An adjusting screw 66 serving as an interval adjusting means is screwed into the housing 61. The distal end 61a of the housing 61 is a stop position designating part for designating the movement stop position of the adjustment piece 62.

At the time of assembly, the adjustment of the urging force of the urging force applying mechanism 60 to the separation roller 4 is performed in the order shown in FIG.

First, as shown in FIG. 2A, the adjusting screw 66 is tightened against the compression spring 63, and the separating pad 65 is tightened.
Is pressed against the separation roller 4 to apply an urging force to the separation roller 4. At this time, the adjustment piece 62 is immersed in the housing 61.

Further, the adjusting screw 66 is tightened, and FIG.
As shown in (b), when the adjustment screw 66 is stopped when the tip 62 a of the adjustment piece 62 is aligned with the tip 61 a of the housing 61, the adjustment piece 62 and the separation pad base 64 are stopped.
The compression spring 63 is compressed to a predetermined length, and a predetermined urging force is applied to the separation roller 4 by its elastic force.

As shown in FIG. 2C, if the adjusting screw 66 is excessively tightened, the distal end 62a of the adjustment piece 62 protrudes ahead of the distal end 61a of the housing 61, so that the overtightening can be recognized at a glance. Has become.

In this manner, the tip 62a of the adjustment piece 62
Is aligned with the leading end 61a of the housing 61, which is a stop position designating part, by adjusting the interval between the adjustment piece 62 and the separation pad base 64 to a predetermined interval without using a measuring instrument conventionally required. The urging force of the separation pad 65 on the separation roller 4 can be adjusted to a predetermined optimum urging force.

When the image forming apparatus (automatic original feeder) 30 is used for a long period of time, both or one of the separation roller 4 and the separation pad 65 is worn, and the urging force applying mechanism 60 separates accordingly. Pad base 64 is housing 6
1, the length of the compression spring 63 is increased, the urging force on the separation roller 4 is weakened, and there is a possibility that a plurality of sheets cannot be separated one by one in cooperation with the separation roller 4.

In such a case, the urging force applying mechanism that can readjust the urging force is the urging force applying mechanism 70 of the second embodiment shown in FIG. This urging force applying mechanism 70
The configuration differs from the urging force applying mechanism 60 of the first embodiment in that a positioning line 72 serving as a stop position designating portion is engraved on the separation pad base 71.

Accordingly, the urging force applying mechanism 6 of the first embodiment
The same reference numerals as those shown in FIGS. 1 and 2 denote the same parts as in the configuration of 0, and a description of those parts will be omitted.

At the time of assembling the urging force applying mechanism 70 of the second embodiment, as shown in FIG. 3A, the adjusting screw 66 is tightened, and the tip 62a of the adjusting piece 62 is moved to the alignment line 72.
The compression spring 63 is compressed to a predetermined length between the adjustment piece 62 and the separation pad base 64,
Is given a predetermined urging force.

Instead of the alignment line 72, the leading end of the separation pad base 71 may have a small diameter, and the boundary between the small diameter portion and the large diameter portion may be a stop position designating portion.

When the image forming apparatus 30 is used for a long time, both or one of the separation roller 4 and the separation pad 10 is worn out, and as shown in FIG. Protruding from. In this case, FIG.
As shown in (c), the length of the compression spring 63 can be adjusted to a predetermined length by screwing the adjustment screw 66 and aligning the tip 62a of the adjustment piece 62 with the alignment line 72.

Accordingly, the urging force applying mechanism 7 of the second embodiment
0 indicates that at the time of assembly and at the time of readjustment after long-term use,
The elasticity of the compression spring 63 can be adjusted to a predetermined elasticity without using a measuring device.

Next, the urging force applying mechanism 80 of the third embodiment will be described.
Will be described with reference to FIG.

In the biasing force applying mechanism 80, a light detecting sensor 81 as an optical distance measuring means is provided on the adjustment piece 62 of the biasing force applying mechanism 60 of the first embodiment, and a separation pad base 64 is provided.
Is provided with a reflection plate 82, the light emitted from the light detection sensor 81 is reflected by the reflection plate 82, and the light detection sensor 81 receives the light, thereby measuring the distance between the adjustment piece 62 and the separation pad base 64. The adjustment screw 66 is rotated by an actuator (not shown) to adjust the width between the adjustment piece 62 and the separation pad base 64 while observing the measurement value displayed on the display panel (not shown). It can be adjusted to.

Therefore, the urging force applying mechanism 80 of the third embodiment also provides the elasticity of the compression spring 63 with a predetermined elasticity without using a measuring device at the time of assembly and at the time of readjustment after long-term use. Can be adjusted.

Next, the urging force applying mechanism 90 of the fourth embodiment will be described.
Will be described with reference to FIGS.

This urging force applying mechanism is screwed onto an adjusting screw 92 on a bracket 91, which is a fixed object, and is provided on a side wall W of the image forming apparatus so as to be vertically movable by a long hole 93 and a pin 94. A moving piece 96 which is a body, and a biasing piece 97 which is also provided on the side wall so as to be vertically movable by the guide of a long hole 95 and a pin 94 and is connected to an end of the optical wire 21. The configuration is such that a tension spring 98 is provided between them.

In this configuration, as shown in FIG. 6B, the adjusting screw 92 is rotated to move the lower surface 96a of the moving piece 96.
By aligning the lower end 97a of the biasing piece 97, which is the stop position designating portion, the tension spring 98 can be made to have a predetermined length, and a predetermined tensile force can be applied to the optical wire 21.

In the adjustment stage, as shown in FIG. 6A, the lower surface 96a of the moving piece 96 is
When the length of the tension spring 98 is shorter than a predetermined length at a position higher than 7a, the tensile force on the optical wire 21 is insufficient. Conversely, as shown in FIG. 6C, the lower surface 96a of the moving piece 96 is located below the lower end 97a of the biasing piece 97, and the length of the tension spring 98 is longer than a predetermined length. In such a case, the tensile force is excessive with respect to the optical wire 21.

In each of these cases, FIG.
By aligning the lower surface 96a of the moving piece 96 and the lower end 97a of the biasing piece 97 as shown in FIG.
8 can be of a predetermined length.

When the optical wire 21 is extended by using the image forming apparatus 30 for a long period of time, the biasing piece 97 approaches the moving piece 96 by the tension spring 98 by an amount substantially extended, and FIG.
The state shown in FIG. In this case, by aligning the lower surface 96a of the moving piece 96 and the lower end 97a of the biasing piece 97 as shown in FIG. A tensile force can be applied.

Accordingly, the urging force applying mechanism 9 of the fourth embodiment
0 also during assembly and readjustment after long-term use.
The elasticity of the tension spring 98 can be adjusted to a predetermined elasticity without using a measuring instrument.

The first, second and fourth embodiments 60 and 7
The adjusting screws 66 and 92 at 0 and 90 may be made rotatable not only by a tool but also by a coin or an actuator (not shown).

Finally, the urging force applying mechanism 1 of the fifth embodiment
00 will be described with reference to FIG.

In the urging force applying mechanism 100, a light detecting sensor 101 as an optical distance measuring means is provided on a moving piece 96 of the urging force applying mechanism 90 of the fourth embodiment, and a reflecting plate 102 is provided on an urging piece 97. The light emitted from the light detection sensor 101 is reflected by the reflection plate 102 and is received by the light detection sensor 101, so that the distance between the moving piece 96 and the urging piece 97 is measured and displayed on a display plate (not shown). While observing the measured values, the adjusting screw 92 is rotated by an actuator (not shown) to adjust the distance between the moving piece 96 and the urging piece 97, so that the tension spring 98 can be adjusted to a predetermined length. ing.

Accordingly, the biasing force applying mechanism 100 of the fifth embodiment also provides the elasticity of the tension spring 98 with a predetermined elasticity without using a measuring device at the time of assembly and at the time of readjustment after long-term use. Can be adjusted.

[0067]

According to the first aspect of the present invention, at the time of assembling the biasing force applying mechanism or at the first use, the biasing force on the biased body can be optimized without using a measuring device. It can be adjusted easily and in a short time. Further, if the adjustment of the biasing force can be performed in a short time, the assembly cost of the biasing force applying mechanism can be reduced.

According to the second aspect of the present invention, if the position specifying portion is provided on the biasing body, even if the position of the biasing body is shifted due to long-term use, the biasing body and the biasing body can be used without using a measuring device. An optimal biasing force can be applied to the biased body by adjusting the distance to the moving body to a predetermined distance. In addition, the adjustment can be easily performed on the user side without the need for a serviceman, and the maintenance and management costs on the maker side for devices and devices incorporating the biasing force imparting mechanism can be reduced. Therefore, the cost of the urging force applying mechanism can be reduced.

According to the third aspect of the present invention, even when the biasing force applying mechanism is assembled, used for the first time, or used for a long period of time, the biasing force to the biased body can be reduced without using a conventional measuring device. It can be easily and quickly adjusted to the optimal urging force.

According to the fourth aspect of the present invention, when the screw is rotated, the moving body follows, the distance between the moving body and the separation pad changes, and the distance between the moving body and the separation pad can be changed without using a measuring instrument. By adjusting the elasticity of the compression spring, the urging force on the sheet separating roller can be adjusted.

According to the fifth aspect of the present invention, the distance between the moving body and the urging body is adjusted without using a measuring device by rotating the screw, and the tension spring between the moving body and the urging body is adjusted. By adjusting the elasticity, the biasing force on the cord can be adjusted.

According to the sixth aspect of the invention, the biasing force of the separation pad with respect to the sheet separation roller can be adjusted optimally without using a measuring device, and the sheets can be reliably separated one by one. Image forming apparatus having a high image quality is obtained.

According to the seventh aspect of the present invention, the urging force of the tension spring with respect to the cord is adjusted without using a measuring device.
A mirror or the like can be moved smoothly, and an image forming apparatus with high image forming accuracy can be obtained.

[Brief description of the drawings]

FIG. 1 is a front sectional view of a state in which an urging force applying mechanism according to a first embodiment of the present invention is provided in a sheet separating unit of an image forming apparatus.

FIGS. 2A and 2B are explanatory diagrams of an adjusting operation of the urging force applying mechanism of FIG. 1, wherein FIG. 2A shows a state where the urging force is insufficient, FIG. 2B shows a state where an appropriate urging force is applied to the object to be biased, and FIG. ) Indicates an excessively biasing state.

3A and 3B are explanatory diagrams of an adjusting operation of an urging force applying mechanism according to a second embodiment, in which FIG. 3A shows a state in which urging force is insufficient, FIG. 3B shows a state in which a proper urging force is applied to an object to be biased, (C) shows a state where the urging force is excessive.

FIG. 4 is a front sectional view of an urging force applying mechanism according to a third embodiment.

FIG. 5 is a front sectional view of an urging force applying mechanism according to a fourth embodiment.

FIGS. 6A and 6B are explanatory diagrams of an adjusting operation of the urging force applying mechanism according to the fourth embodiment, in which FIG. 6A shows a state where the urging force is insufficient, FIG. 6B shows a state where an appropriate urging force is applied to the urging member, (C) shows a state where the urging force is excessive.

FIG. 7 is a front sectional view of an urging force applying mechanism according to a fifth embodiment.

FIG. 8 is a front sectional view of the image forming apparatus in which the urging force applying mechanism according to the embodiment of the present invention is incorporated.

FIG. 9 is a schematic diagram showing a state in which an optical wire is bridged.

FIG. 10 is a front sectional view showing a state in which a conventional urging force applying mechanism is provided in a sheet separating unit of an image forming apparatus.

FIG. 11 is a front sectional view of an image forming apparatus in which another conventional urging force applying mechanism is incorporated.

[Explanation of symbols]

 S Sheet (biased body) 4 Separation roller (biased body) 21 Optical wire (cored strip) 30 Image forming device 39 Sheet separation unit 40 Optical path unit 60, 70, 80, 90, 100 Urging force applying mechanism Reference Signs List 61 housing (fixed object) 61a tip of housing (stop position designating part) 62 adjustment piece (moving body) 63 compression spring (elastic body) 64 separation pad base (biasing body) 66 adjustment screw (interval adjusting means) 72 position Matching line (stop position designation part) 81, 101 Light detection sensor (optical distance measuring means) 91 Bracket (fixed object) 96 Moving piece (moving body) 97 Urging piece (urging body) 98 Tension spring (elastic body)

Claims (7)

[Claims] 1. An urging force applying mechanism capable of adjusting an urging force of an elastic body applied to an energized body, wherein the energized body is located at one end of the elastic body and the elastic body of the elastic body is used to displace the energized body. A movable urging body for urging in the direction, a movable body positioned at the other end of the elastic body and capable of approaching and separating from the urging body, and moving the moving body to move the urging body and the urging body. An interval adjusting means for adjusting an interval between the moving body and a stop position designating section for designating a movement stop position of the moving body so as to set an interval between the urging body and the moving body to a predetermined interval. An urging force applying mechanism. 2. The urging force applying mechanism according to claim 1, wherein said stop position designating section is provided on said urging body. 3. An urging force applying mechanism capable of adjusting an urging force of an elastic body applied to an energized body, wherein the energized body is located at one end of the elastic body and the elastic body of the elastic body disposes the energized body. A movable urging body for urging in the direction, a movable body positioned at the other end of the elastic body and capable of approaching and separating from the urging body, and moving the moving body to move the urging body and the urging body. An interval adjusting means for adjusting a gap between the moving body and an optical distance measuring means provided on the urging body and the moving body for measuring a distance between the urging body and the moving body. An urging force applying mechanism characterized by the following. 4. The apparatus according to claim 1, wherein the biased member is a sheet separating roller,
3. The device according to claim 1, wherein the elastic body is a compression spring, the biasing body is a separation pad base having a separation pad, and the gap adjusting means is a screw provided on a fixed body. 3. The urging force applying mechanism according to 3. 5. The apparatus according to claim 1, wherein the biased body is a cable body for moving a mirror, the elastic body is a tension spring, and the gap adjusting means is a screw provided on a fixed object. Item 4. The urging force applying mechanism according to item 1, 2, or 3. 6. An image forming apparatus comprising the biasing force applying mechanism according to claim 4 in a sheet separating section. 7. An image forming apparatus comprising the biasing force applying mechanism according to claim 5 in an optical path section.