JP2000177868A - Sheet material feeder and image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To find the time to change a sheet material feeder means more accurately than before. SOLUTION: The rotation speed v1 of a paper feeder roller and the rotation speed v2 of a separation roller detected by encoders are compared (Step 1 to 3), a count index number is added to a count area when v1≈v2 (Step 4). When the speeds v1 and the speed v2 are different (Step 5), the count area is updated by adding a count index number multiplied by a speed coefficient reflecting the difference (Step 6, Step 7). A CPU checks whether a count value reaches a prescribed value when the value is updated (Step 8, Step 9). If the count value reaches the prescribed value, the CPU determines that the time limit for changing a pick up roller, a paper feeder roller and a separation roller is reached and indicates that effect (Step 10).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet feeding apparatus having means for detecting the replacement timing of sheet feeding means and an image forming apparatus having such a sheet feeding apparatus.

[0002]

2. Description of the Related Art In various image forming apparatuses such as a copying machine, a printer, a facsimile or a printing machine, a large number of sheet conveying rollers for conveying a sheet such as a transfer sheet, a recording sheet, a printing sheet or an original are used. . For example, in a paper feeding unit of a copying machine, a transfer paper cut to a predetermined size is set in a paper feed cassette, a pickup roller is brought into contact with the uppermost transfer paper, and this roller is rotationally driven to rotate the transfer paper. From the paper feed cassette, and passes the transferred transfer paper between a paper feed roller rotating in the feeding direction and a separation roller rotating in the opposite direction to the feeding direction.
One transfer sheet is transported toward the transfer section while preventing double feed of the transfer sheet.
The paper feed roller or the separation roller is an example of the sheet material transport roller.

If the above-mentioned pickup roller, paper feed roller, and separation roller are collectively referred to as a sheet material feeding roller (sheet material feeding means), the sheet material feeding roller will be used as its use time elapses. If the surface is worn and left unattended, the sheet material such as transfer paper may suffer from skew or jam. Therefore, it is necessary to replace the sheet feeding roller with a new one after using the sheet feeding roller for a predetermined time.

[0004]

Therefore, conventionally, when the number of formed images reaches a predetermined number, the sheet feeding roller is replaced with a new roller. The following problems occur.

Conventionally, a counter for checking the number of copies of a copier has a predetermined number, for example, 30,000 or 8
When counting the number of sheets, such as 10,000 or 100,000,
A specialized service man had replaced the feed rollers. However, depending on the user who uses the copying machine, there are those who often use small-size transfer paper of A4 size or less, and those who often use large-size transfer paper such as A3 size. The manner of use varies.

On the other hand, when a large-size transfer sheet is fed from the paper feeding unit, it is more difficult to feed a small-size transfer sheet.
The rotation time of the feed roller becomes longer. For example, when only small-sized transfer paper of A4 size is fed and when only large-sized transfer paper of A3 size is fed, the latter has almost twice the net use time of the feed roller. become longer.

Further, in a state in which the transfer paper is multi-fed from the paper feed unit and the transfer paper multi-fed by the separation roller is returned to the paper feed unit, one sheet is not particularly fed to the paper feed roller without being multi-fed. Load is being applied when the transfer paper is fed.

Therefore, if the feeding roller is replaced uniformly when the number of copies reaches a predetermined number as in the prior art, the feeding roller that can still be used is replaced, or conversely, the limit is exceeded. In some cases, it is necessary to continue using the feeding roller, and there is a possibility that the transfer paper may be jammed or skewed.

As described above, conventionally, the roller was uniformly replaced at a certain time without considering how much the feed roller was actually used and how much the abrasion had progressed.
The above-described problem has occurred.

SUMMARY OF THE INVENTION The present invention has been made to solve the problems of the prior art, and an object of the present invention is to provide a sheet material capable of knowing the replacement time of sheet material feeding means more accurately than in the past. An object of the present invention is to provide a feeding device and an image forming apparatus.

[0011]

In order to solve the above-mentioned problems, according to the present invention, at least one sheet material storing means for storing a sheet material, and the sheet material is fed from the sheet material storing means. Sheet material feeding means, wherein the sheet material feeding means is provided at least between a first feeding rotating body that is driven to rotate in a feeding direction of the sheet material and the first feeding rotating body. The sheet material is pinched, and the sheet material is rotated and driven in a direction opposite to the first feeding rotating body when a plurality of pinched sheet materials are provided. A sheet feeding device that includes a second feeding rotator that rotates with respect to the first feeding rotator in the feeding direction of the sheet, wherein a first rotation speed of the first feeding rotator is detected. Rotation speed detecting means, and detecting the rotation speed of the second feeding rotator Second rotation speed detection means, the rotation speed of the first feed rotator detected by the first rotation speed detection means, and the second supply speed detected by the second rotation speed detection means. A peripheral speed comparison / judgment unit for comparing a peripheral speed at a nip portion between the first feeding rotator and the second feeding rotator based on a rotation speed of the feeding rotator; and a usage state of the sheet material feeding unit. Index value holding means for holding an index value indicating, and the index value held in the index value holding means for each sheet material feeding operation, to a value obtained by performing a predetermined arithmetic processing on the index value Processing means for replacing and holding the index value holding means, processing setting means for setting arithmetic processing to be performed according to the determination result by the peripheral speed comparison determining means, and index value held by the index value holding means And the use of the sheet material feeding means. Characterized by having a sheet feeding unit replacement timing detecting means and an index value comparison determination unit determines the replacement timing of the sheet feeding means by comparing the control value indicating the limit.

[0012] According to this configuration, the transport load applied to the sheet material feeding means through the peripheral speed at the nip portion between the first feeding rotating body and the second feeding rotating body can be used to reduce the usage state of the sheet material feeding means. Since it can be reflected on the indicated index value, it becomes possible to know the replacement time of the sheet material feeding means more accurately than before.

[0013] Further, there are provided a plurality of sheet material storage means for storing the sheet material, wherein each of the sheet material storage means feeds the sheet material from the sheet material storage means; Sheet material size detection means for detecting the size of the sheet material stored in the material storage means,
The respective sheet material feeding means sandwiches the sheet material between at least a first feeding rotator that is rotationally driven in the sheet material feeding direction and the first feeding rotator, and holds the sheet material. When the number of the sheet materials is plural, the sheet is rotated in the direction opposite to the first feeding rotating body, and when the number of the sandwiched sheet materials is one, the second sheet is fed in the feeding direction of the sheet material. In a sheet material feeding apparatus including a second feeding rotator that rotates with respect to one feeding rotator, a first rotation speed detecting unit that detects a rotation speed of each of the first feeding rotators, Second rotation speed detection means for detecting the rotation speed of each of the second feed rotator, and the rotation speed of each first feed rotator detected by each of the first rotation speed detection means, And the rotation speed of each of the second feeding rotators detected by each second rotation speed detection means. A peripheral speed comparison / judgment means for judging a peripheral speed at a nip portion between each of the first feeding rotary body and the second feeding rotary body, and an index value indicating a use state of each of the sheet material feeding means. Index value holding means, and the index value held in the index value holding means corresponding to the sheet material feeding means used for each feeding operation of the sheet material stored in the sheet material storage means, the index value Processing means for causing the index value holding means to replace the value with a value obtained by performing a predetermined arithmetic processing on the sheet material, a determination result obtained by a peripheral speed comparison determining means corresponding to the used sheet material feeding means, and the sheet material Processing setting means for setting arithmetic processing to be performed in accordance with the size of the fed sheet material detected by the size detecting means; an index value held in each index value holding means; Use of transmission means A sheet material feeding means replacement time detecting means comprising: an index value comparing / judging means for comparing the sheet feeding means with a control value indicating a boundary to determine the time of replacement of each sheet feeding means. Feeding device.

According to this configuration, the sheet feeding means is applied to each sheet feeding means via the peripheral speed of the nip portion between each of the first feeding rotary body and the second feeding rotary body and the size of the fed sheet material. Since the transport load can be reflected in the index value indicating the use state of each sheet feeding means, it is possible to know the replacement timing of the sheet feeding means more accurately than in the past.

The arithmetic processing is an addition processing for adding a predetermined value to the index value held in the index value holding means, and the processing setting means is configured to add the index value held in the index value holding means. , A value to be added may be set, and the control value may be an upper limit value.

Further, the arithmetic processing is an addition processing for adding a predetermined value to the index value held in the index value holding means, and the processing setting means sets the index value held in each index value holding means. As a value to be added to the value, a value obtained by multiplying an index corresponding to the sheet material size detected by the sheet material size detection means by a coefficient according to the determination result of the peripheral speed comparison determination means is set, The control value may be an upper limit value.

[0017] Further, display means may be provided for displaying information on replacement time of the sheet material feeding means based on the judgment result of the index value comparison judging means.

[0018] Further, a transmission means may be provided for transmitting information relating to the replacement time of the sheet material feeding means to an external device based on the determination result of the index value comparison determination means.

An image forming apparatus comprising: a recording material feeding means for feeding a sheet-shaped recording material; and an image forming means for forming an image on the recording material fed by the recording material feeding means. In the above, a sheet material feeding device according to the present invention may be provided as the recording material feeding means.

As such an image forming apparatus, there are a copying machine, a printer, a facsimile, a printing machine and the like, and a known image forming means can be used.

Here, there are provided document feeding means for feeding a sheet-shaped document, and image forming means for forming an image on a recording material based on the image of the document fed by the document feeding means. In the image forming apparatus, the sheet feeding device according to the present invention may be provided as the document feeding device. As such an image forming device, there is a copying machine or the like. Can be used.

[0022]

Embodiments of the present invention will be described below in detail with reference to the drawings.

(First Embodiment) FIG. 1 is a schematic view showing a paper feeding section of a copying machine, and FIG. 2 is a detailed view of the paper feeding section. A plurality of transfer papers 6, which are examples of sheet materials, are stacked and set on a lifting tray 5 in a sheet feeding cassette 4 as the sheet material storage means. The elevating tray 5 is provided so as to be movable up and down with respect to the sheet cassette 4.

The pickup roller 1 is disposed downstream of the transfer sheet 6 in the sheet feeding direction (right side in the figure) in contact with the transfer sheet 6. Further, on the downstream side in the paper feeding direction, a paper feeding roller (first feeding rotating body) 2 and a separation roller (second feeding rotating body) 3 having the same outer diameter are arranged, and the transfer sent out by the pickup roller 1 is performed. The paper 6 is sent to a main body (not shown).

Encoders (first rotational speed detecting means, second rotational speed detecting means) 17 and 18 are provided on the same axis of the feed roller 2 and the separation roller 3, respectively. And the rotation speed of the separation roller 3 can be detected.

In the vicinity of the rear end of the transfer paper 6, a tray height detecting lever 8 and a photo sensor 7 are arranged. As the paper feeding operation proceeds, when the height of the uppermost surface of the transfer paper 6 on the elevating tray 5 becomes lower than that of the pickup roller 1, the photosensor 7 detects this via the tray height detection lever 8. Then, the elevating tray 5 is raised by means (not shown) so that the height of the uppermost surface of the transfer paper 6 is again at a predetermined position.

FIG. 3 is a block diagram showing a schematic configuration of the control circuit. A CPU 9 for controlling the whole is provided,
The CPU 9 stores an R in which a control program is stored.
OM13, R in which various data and tables are stored
The AM 14, the operation panel 12, the control circuit 15, the first roller rotation speed detection unit 11, and the second roller rotation speed detection unit 16 are connected.

The RAM 14 is provided with a use roller count status area (index value holding means). The RAM 14 is supplied with a power supply voltage from a battery (not shown) even when the power is turned off.
Further, it may be constituted by an EEPROM.

The service life of the feed roller is set to, for example, "100,000 points" in the RAM 14, and the count value (index value) of the feed roller use status count area becomes "100,000". At this time, the CPU 9 determines the replacement time (lifetime) of the corresponding feed roller, and provides guidance on the operation panel 12 having the content.

Next, the paper feeding operation in such a configuration will be described with reference to the flowchart shown in FIG.

First, when a copy key is input, a paper feeding operation is started, and the rotation speed v ₁ of the paper feeding roller 2 is detected (step 1). It is also detected rotational speed v ₂ of the separation roller 3 at the same time (Step 2). And to compare the peripheral speed of the rollers, by comparing the rotational speed of both (Step 3), v ₁ ≒ v _2, then namely paper feed roller 2 and the separation roller 3 in multifeed the absence of the sheet If it is rotating, a count index (for example, "A") is added to the count area (step 4). v The ₁ and v If the speed of the ₂ different (step 5), because the state in which the sheet is fed at the count index multiplied by considering speed coefficient it (for example, "1.1A", "1. 2A ") to update the count value in the count area (steps 6 and 7).

CPU (peripheral speed comparison / determination means, processing means,
The process setting means and the index value comparing / judging means) 9 confirms whether or not the value has reached "100,000" when the storage content of the feed roller use status count area is updated (steps 8 and 9). If it has reached "100,000", it is determined that it is time to replace the pickup roller 1, paper feed roller 2, and separation roller 3 whose count value has reached "100,000". A guidance is displayed on a message display (not shown) (not shown) (step 1).
0).

When the supply roller whose life has expired is replaced, the count value in the supply roller use status count area is cleared at the same time.

The display contents of the message display section may be always displayed on the display section so that the general user can always check the contents, or the display contents may be called only by a service person in the service mode. Good. According to the former method, a general user other than the service person can always know the wear state of the feeding roller. If the latter method is adopted, a service person can connect the copy line to the copier so that the count value in the feed roller usage count area can be called over the telephone by the service mode. Even without going on, it is possible to check the usage state of the feed roller up to the present, that is, the wear state.

Further, two set values of the service life are provided for the first and second set values, and when the count value reaches the first set value, a warning display that the feed roller will soon reach the service life is displayed. If the replacement is displayed when the second set value is reached, the user can contact the service person in advance or prepare a replacement feed roller if the user can perform the replacement work by himself. I can do it.

In the present invention, the roller rotation speed is detected using an encoder. However, the roller rotation speed detection means is not limited to this.

(Second Embodiment) FIG. 5 is a schematic diagram showing a paper feeding section of a copying machine. Three-stage paper feed unit 100, 101, 1
02, and each paper feed cassette (sheet material storage means) 30, 31, 32 has transfer paper 3 as a sheet material.
A large number of sheets 6, 37, 38 are stacked and set on the lifting trays 33, 34, 35. This lifting tray 3
The reference numerals 3, 34, 35 are provided so as to be vertically movable with respect to the paper feed cassettes 30, 31, 32.

A4 size transfer paper 36 is loaded in the cassette 30 of the upper paper supply unit 100.

The pickup roller 21 is disposed downstream of the A4 transfer paper 36 in the paper feeding direction (right side in the drawing) in contact with the A4 transfer paper 36. Further, on the downstream side in the paper feeding direction, a paper feeding roller (first feeding rotating body) 22 and a separation roller (second feeding rotating body) 23 having the same outer diameter are arranged. The transfer paper 36 is sent out to a main body (not shown).

Encoders (first rotational speed detecting means, second rotational speed detecting means) 51 and 52 are provided on the same axis of the paper feed roller 22 and the separation roller 23, respectively. The rotation speed of the separation roller 23 can be detected.

In the vicinity of the rear end of the A4 transfer paper 36, a tray height detecting lever 40 and a photo sensor 39 are arranged. As the paper feeding operation proceeds, when the height of the uppermost surface of the A4 transfer paper 36 on the elevating tray 33 becomes lower with respect to the pickup roller 21, it is detected by the tray height detection lever 4.
0, the photo sensor 39 detects it, and the elevating tray 33 is raised by means (not shown) so that the height of the uppermost surface of the A4 transfer paper 36 becomes the predetermined position again.

A4R size (A4 landscape) transfer paper 37 is loaded in the cassette 31 of the middle paper supply unit 101.

The structure of the pickup roller 2
4, a feed roller (first feeding rotary body) 25, a separation roller (second feeding rotary body) 26, a tray height detection lever 42,
A photo sensor 41 and encoders (first rotational speed detecting means, second rotational speed detecting means) 53 and 54 are arranged in the same manner as the upper sheet feeding unit 100.

A3 size transfer papers 38 are stacked in the cassette 32 of the lower paper supply unit 102.

Regarding the structure, the pickup roller 2
7, a sheet feeding roller (first feeding rotating body) 28, a separation roller (second feeding rotating body) 29, a tray height detecting lever 44,
The photo sensor 43 and the encoders (first rotation speed detecting means, second rotation speed detecting means) 55 and 56 are arranged similarly to the upper sheet feeding unit 100 and the middle sheet feeding unit 101.

Further, a sheet size detecting section (sheet material size detecting means) (not shown) is disposed in each of the sheet feeding sections 100, 101, and 102, respectively.

A sheet conveying path 47 is disposed downstream of each feed roller of the sheet feeding units 100, 101 and 102.
In the upstream portion of the sheet transport path 47, the lower sheet feeding cassette 3 is provided.
A transport roller pair 45 is provided as a positioning / transporting means for positioning and transporting the A3 transfer paper 38 fed from the second feeder 2. In the middle part of the sheet transport path 47, the A4R transfer paper 37 fed from the middle paper feed cassette 31 is aligned and transported, and the A3R transfer paper 37 fed from the lower paper feed cassette 32 is fed.
A transport roller 46 is provided as a positioning and transporting unit for transporting the transfer paper 38. Then, each transfer sheet is sent to a main body (not shown).

FIG. 6 is a block diagram showing a schematic configuration of the control circuit. A CPU 9 for controlling the whole is provided,
The CPU 9 stores an R in which a control program is stored.
OM13, R in which various data and tables are stored
AM 14, operation panel 12, control circuit 15, roller rotation speed first detection unit 11, roller rotation speed second detection unit 16,
The sheet size detection unit 10 is connected.

The RAM 14 is provided with a sheet size table, a sheet size index table, and a feed roller use status count area (index value holding means).

In the sheet size table, the corresponding paper feed cassettes 30 supplied from the sheet size detection unit 10,
The sheet size corresponding to the detection result of the projection of the claw portion (not shown) obtained by setting 31 and 32 is stored.

In the sheet size index table, for example, an index (count increment) for each sheet size based on the B5 size is stored. For example, as shown in FIG. 7, when the sheet size is B5 (vertical placement), the length in the sheet feeding direction is 182 mm, and the index is obtained as (182/182) × 100 = 100. 100 ". Sheet size is A
In the case of 4 (vertical installation), similarly, it is obtained as (210/182) × 100 = 115, and thus becomes “115”. In this way, for sheets of other sizes, "141" for B5R (landscape) and "16" for A4R (landscape)
3 "," 200 "for B4 (vertical installation), and" 231 "for A3 (vertical installation).

In the feed roller use status count area,
The status of use for each feed roller is stored by accumulating indices corresponding to the sheet size and accumulating indices in consideration of a feeding speed described later. The usage status of each feed roller 102 is stored.

The RAM 14 is supplied with a power supply voltage from a battery (not shown) even when the power supply is turned off. Further, it may be constituted by an EEPROM.

The life of the feed roller is set to, for example, "1 million points" in the RAM 14, and when the count value of the feed roller use status count area becomes "1 million", the CPU 9 The replacement time (lifetime) of the corresponding feed roller is determined, and the content is guided on the operation panel 12.

Next, the paper feeding operation in such a configuration will be described with reference to the flowchart shown in FIG.

First, when a copy key is input, a paper feeding operation is started. In response to this input, the CPU (peripheral speed comparison / determination means, processing means, processing setting means) 9 feeds the paper cassettes (30, 31, 3) in which the corresponding transfer paper is stored.
Judge 2). Then, for example, when it is determined that the A3 transfer paper 38 stored in the paper feed cassette 32 is fed (step 11), (for determining the peripheral speed of the paper feed roller).
Rotational speed v ₁ of the paper feed roller 28 is detected (step 12). At the same time, the rotation speed v ₂ of the separation roller 29 is also detected (to determine the peripheral speed of the separation roller) (step 1).
3). Then, the two rotational speeds are compared (step 1).
4), if v ₁ ≒ v ₂ , that is, if the feed roller 28 and the separation roller 29 are rotating without the double feed of the sheet, the CPU 9 reads the index “A3 size” from the sheet size index table. 231 ”is read out (step 15), and the index“ 231 ”is cumulatively added to the area for the feed roller of the lower paper feed unit 102 of the feed roller use status count area (step 16). v ₁ and v
If the speeds of ₂ are different (step 17), the index “2”
31 "is multiplied by a speed coefficient (for example, 1.1 or 1.2), and the value is cumulatively added to the count value in the count area (steps 18 to 19, steps 20 to 21).

When it is determined that the A4R transfer paper 37 stored in the paper cassette 31 is fed,
The PU 9 reads out the index “163” for the A4R size from the sheet size index table and, based on the detected feeding speed of the A4R transfer paper 37, reads the feeding roller usage count area for the feeding roller of the middle sheet feeding unit 101. The area is cumulatively added with the index “163” or a value obtained by multiplying the index by the speed coefficient (steps 11 and 2).
1).

When it is determined that the A4 transfer paper 36 stored in the paper cassette 30 is fed,
U9 reads the index “141” for the A4 size from the sheet size index table and detects the detected A4 transfer paper 3
On the basis of the feed speed of No. 6, the area for the feed roller of the upper feed unit 100 of the feed roller use status count area is cumulatively added with a value obtained by multiplying the index “141” or “141” by a speed coefficient ( Steps 11 to 21).

The CPU (index value comparison / judgment means) 9 confirms whether or not the value has reached "1 million" when the storage content of the feed roller use status count area is updated (step 22, step 22). 23) If the count value has reached “1,000,000”, it is determined that it is time to replace the pickup roller 27, the feed roller 28, and the separation roller 29 whose count value has reached “1,000,000”. Is displayed in a message display section (not shown) (step 24).

Feed rollers 27, 28, 29 whose life has expired
At the same time, the count value in the usage count area of the feed roller is cleared.

The display contents of the message display unit may be always displayed on the display unit so that the general user can always check it, or only the service person may call up the display contents in the service mode. Good. According to the former method, a general user other than the service person can always know the wear state of the feeding roller. If the latter method is adopted, a service person can connect the copy line to the copier so that the count value in the feed roller usage count area can be called over the telephone by the service mode. Even without going on, it is possible to check the usage state of the feed roller up to the present, that is, the wear state.

Further, two set values of the service life are provided for the first and second set values, and when the count value reaches the first set value, a warning display indicating that the service life of the feeding roller will soon be reached. If the replacement is displayed when the second set value is reached, the user can contact the service person in advance or prepare a replacement feed roller if the user can perform the replacement work by himself. I can do it.

In the present invention, the roller rotation speed is detected by using the encoder, but the roller rotation speed detecting means is not limited to this.

[0064]

As described above, according to the present invention,
The transport load applied to the sheet material feeding means can be reflected on the index value indicating the use state of the sheet material feeding means via the peripheral speed at the nip portion between the first feeding rotating body and the second feeding rotating body. Therefore, it is possible to know the replacement time of the sheet material feeding means more accurately than in the past.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating a sheet feeding unit of a copying machine according to a first embodiment of the present invention.

FIG. 2 is a detailed view of a sheet feeding unit of the copying machine according to the first embodiment of the present invention.

FIG. 3 is a block diagram showing a schematic configuration of a control circuit of the copying machine according to the first embodiment of the present invention.

FIG. 4 is a flowchart showing a procedure for determining a replacement time of a feed roller of the copying machine according to the first embodiment of the present invention.

FIG. 5 is a schematic diagram illustrating a paper feeding unit of a copying machine according to a second embodiment of the present invention.

FIG. 6 is a block diagram showing a schematic configuration of a control circuit of a copying machine according to a second embodiment of the present invention.

FIG. 7 is a table showing indices for each sheet size in a copying machine according to a second embodiment of the present invention.

FIG. 8 is a flowchart showing a procedure for determining a replacement time of a feed roller of a copying machine according to a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pickup roller 2 Paper feed roller 3 Separation roller 4 Paper feed cassette 6 Transfer paper 9 CPU 10 Paper size detection part 11 Roller rotation speed first detection part 12 Operation panel 13 ROM 14 RAM 15 Control circuit 16 Roller rotation speed second detection part 17, 18 Encoders 21, 24, 27 Pickup rollers 22, 25, 28 Feed rollers 23, 26, 29 Separation rollers 30, 31, 32 Paper cassettes 36, 37, 38 Transfer papers 51, 52, 53, 54, 55 , 56 encoder

Claims (7)

[Claims] 1. At least one sheet material storing means storing a sheet material, and a sheet material feeding means for feeding a sheet material from the sheet material storing means, wherein the sheet material feeding means comprises: At least, the sheet material is sandwiched between a first feeding rotator that is driven to rotate in the sheet material feeding direction and the first feeding rotator, and the sandwiched sheet material is a plurality of sheets. In this case, the sheet is driven to rotate in the opposite direction to the first feeding rotary body, and when one sheet material is sandwiched, the sheet material is moved in the feeding direction of the sheet material with respect to the first feeding rotary body. A sheet material feeding device including a rotating second feeding rotator; a first rotation speed detecting means for detecting a rotation speed of the first feeding rotator; and a rotating speed of the second feeding rotator. Second rotation speed detection means for detecting the first rotation speed detection The first feeding rotator based on the rotation speed of the first feeding rotator detected by the step and the rotation speed of the second feeding rotator detected by the second rotation speed detecting means. And a peripheral speed comparison / determination unit that compares the peripheral speed at the nip portion of the second feeding rotary body; an index value holding unit that holds an index value indicating a use state of the sheet material feeding unit; Processing means for replacing the index value held by the index value holding means with a value obtained by performing a predetermined arithmetic processing on the index value for each feeding operation and causing the index value holding means to hold the index value; A process setting unit that sets an arithmetic process to be performed according to a determination result by the comparison determination unit; and compares an index value held in the index value holding unit with a control value indicating a use limit of the sheet material feeding unit. And said sheet material feeding means Sheet feeding apparatus characterized by having a sheet feeding unit replacement timing detecting means and an index value comparison determination unit that determines the replacement timing. 2. A sheet material storage means having a plurality of sheet material storage means for storing sheet materials, wherein each of said sheet material storage means feeds a sheet material from said sheet material storage means, and said sheet material storage means. Sheet material size detecting means for detecting the size of the sheet material stored in the material storing means, wherein each of the sheet material feeding means is rotated at least in a feeding direction of the sheet material. The sheet rotating member is sandwiched between a feeding rotary member and the first feeding rotating member, and is rotated in a direction opposite to the first feeding rotating member when a plurality of pinched sheet members are provided. And a second feeding rotator that rotates with the first feeding rotator in the feeding direction of the sheet material when the number of the sandwiched sheet materials is one. In the first to detect the rotation speed of each of the first feed rotating body Rotation speed detection means, second rotation speed detection means for detecting the rotation speed of each of the second feeding rotators, and each of the first feeding rotators detected by each of the first rotation speed detection means Nip of each of the first feeding rotator and the second feeding rotator based on the rotation speed of the first feeding rotator and the rotation speed of each of the second feeding rotators detected by the respective second rotation speed detecting means. A peripheral speed comparison / determination unit that compares and determines the peripheral speed in the unit; an index value holding unit that holds an index value indicating a use state of each sheet material feeding unit; and a sheet material stored in the sheet material storage unit. The index value holding unit replaces the index value held in the index value holding unit corresponding to the sheet material feeding unit used for each feeding operation with a value obtained by performing a predetermined calculation process on the index value. Processing means for holding the used sheet; Processing setting means for setting arithmetic processing to be performed in accordance with the determination result by the peripheral speed comparison determining means corresponding to the feeding means and the size of the fed sheet material detected by the sheet material size detecting means, An index value comparing / determining means for comparing an index value held in each of the index value holding means with a control value indicating a use limit of the sheet material feeding means to determine a replacement time of each sheet feeding means; A sheet material feeding device comprising a sheet material feeding means replacement time detecting means comprising: 3. The calculation processing is an addition processing for adding a predetermined value to an index value held in the index value holding means, and the processing setting means is an index value held in the index value holding means. The sheet material feeding device according to claim 1, wherein a value to be added is set for the sheet material, and the reference value is an upper limit value. 4. The calculation processing is an addition processing for adding a predetermined value to the index value held in the index value holding means, and the processing setting means is configured to add the index value held in each of the index value holding means. As a value to be added to the value, a value obtained by multiplying an index corresponding to the sheet material size detected by the sheet material size detection means by a coefficient according to the determination result of the peripheral speed comparison determination means is set, 3. The sheet feeding apparatus according to claim 2, wherein the control value is an upper limit value. 5. A display device according to claim 1, further comprising display means for displaying information on a replacement time of said sheet material feeding means based on a judgment result of said index value comparison judging means. The sheet material feeding device according to the above. 6. A transmitting means for transmitting information on a replacement time of said sheet material feeding means to an external device based on a judgment result of said index value comparison judging means. 5. The sheet material feeding device according to any one of 5. 7. An image forming apparatus comprising: a recording material feeding unit configured to feed a sheet-shaped recording material; and an image forming unit configured to form an image on the recording material fed by the recording material feeding unit. The image forming apparatus according to any one of claims 1 to 6, further comprising the sheet material feeding device according to any one of claims 1 to 6 as the recording material feeding unit.