JP2002301692A - Shaft member support structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the shaft member support structure for supporting a cam shaft freely to turn and slide and capable of smoothening the sliding operation of the cam shaft. SOLUTION: The cam shaft 81 is directly supported by two bearings 82 and 83, and a right end of the cam shaft positioned in right of the bearing 83 is indirectly supported by a bearing 96 through a sleeve 95. With this structure that two bearings 82 and 83 are used to directly support the shaft member 81, both the two bearings 82 and 83 can be accurately arranged on the same shaft, and the shaft member 81 can smoothly slide.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a shaft member supporting structure for rotatably and slidably supporting a shaft member.

[0002]

2. Description of the Related Art As a shaft member rotatably and slidably supported, for example, a cam shaft in which a plurality of cam members are arranged along a longitudinal direction is known.

FIG. 4 shows an example (conventional example) of such a camshaft and its supporting structure.

The camshaft 1 has three bearings 2a,
2b and 2c are supported rotatably and slidable in the axial direction. At the center of the camshaft 1, five cam members 3a to 3e each having a cam surface a to e are fixed, and below these cam members 3a to 3e, five punch members 4a to 4e move up and down. It is arranged as possible. A solenoid 5 is connected to the left end of the camshaft 1.
Moves to the left when the solenoid 5 is turned on, against the spring force of the compression spring 6 interposed between the large-diameter portion 1a at the right end and the bearing 2c. At this time, as shown in FIG. The cam surfaces b and d of the cam members 3b and 3d
b, 4d. On the other hand, the camshaft 1 has a solenoid 5
Is turned to the right by the compression spring 6 with
The cam surfaces a, c, e of the cam members 3a, 3c, 3e correspond to the punch members 4a, 4c, 4e, respectively. A sleeve 7 (pipe member) is loosely fitted to the right end side of the camshaft 1. The left end of the sleeve 7 is rotatably supported by the bearing 2b described above, and is connected to the camshaft 1 by a pin 8. The pin 8 penetrates a long axially extending pin hole penetrating the camshaft 1 in the radial direction, and further penetrates the sleeve 7. Thus, the camshaft 1 cannot rotate relative to the sleeve 7 and can slide in the axial direction. On the outer circumference of the sleeve 7,
The drive gear 9a is loosely fitted, and the power transmitted to the drive gear 9a is transmitted to the pin 8 via the spring clutch 9b and cut off.

When the spring clutch 9b is turned on in the state shown in FIG. 4, that is, in a state where the solenoid 5 is on and the camshaft 1 is moved to the left, the rotation of the driving gear 9a is controlled by the spring clutch 9b and the pin 8 To the camshaft 1 to rotate the five cam members 3a to 3e. Due to this rotation, the punch members 4 are formed by the cam surfaces b, d of the cam members 3b, 3d.
b and 4d are operated, whereby two punch holes are punched in a recording material such as paper. On the other hand, when the solenoid 5 is turned off, the camshaft 1 moves to the right, and the rotation of the cam surfaces a, c, e of the cam members 3a, 3c, 3e causes the punch members 4a, 4c, 4e to rotate. Is activated, and three punch holes can be made.

[0006]

According to the above prior art, the camshaft 1 is rotatably and slidably supported by the three bearings 2a, 2b, 2c, so that there is no particular problem in the rotation operation. However, the sliding operation may not be performed smoothly.

That is, it is difficult to accurately arrange the three bearings 2a, 2b, 2c coaxially. If the accuracy is insufficient, the bearings off the coaxial axis cause the cam shaft 1 to slide. This causes a resistance when the sliding operation is performed.

[0008] This kind of problem is not limited to the case where the shaft member is a camshaft, but is a problem that generally occurs when the shaft member is rotatably and slidably supported.

Accordingly, the present invention provides a shaft member supporting structure for rotatably and slidably supporting a shaft member (in the above description, a camshaft), wherein the shaft member is supported so that the sliding operation can be performed smoothly. It is intended to provide a structure.

[0010]

The invention according to claim 1 is
One end side is inserted into the pipe member on which the disconnection mechanism is exterior,
The present invention relates to a support structure for a shaft member connected to the pipe member so as to be relatively non-rotatable and slidable in the axial direction. The shaft member supporting structure of the present invention includes a pipe member,
The shaft member is rotatably supported by bearings arranged at two different positions in the longitudinal direction, and the shaft member is rotatable and axially arranged by bearings arranged at two different positions in the longitudinal direction on the other end side without the pipe member. It is characterized by being slidably supported.

According to a second aspect of the present invention, there is provided a shaft member supporting structure according to the first aspect, wherein the shaft member operates a plurality of punch members arranged along the longitudinal direction. A plurality of cam members are fixed camshafts, and the selection of the punch member to be operated is switched by moving the plurality of cam members in accordance with the axial sliding operation of the camshaft.

[0012]

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

FIG. 1 shows an example of an image forming apparatus to which a support structure for a shaft member according to the present invention is applied. FIG. 1 is a vertical cross-sectional view schematically showing a schematic configuration of the image forming apparatus. The image forming apparatus 10 shown in FIG. 1 includes an image forming apparatus main body 11 and a recording material post-processing apparatus 12. In addition,
In the present embodiment, a description will be given of an electrophotographic type as the image forming apparatus 10 and a finisher having a punching unit and a stapler as the recording material post-processing apparatus 12, but the present invention is not limited to these. Not something.

Hereinafter, the configuration and operation of the image forming apparatus main body 11, the configuration and operation of the recording material post-processing apparatus 12, the support structure of the shaft member and its operation will be described in this order.

<Configuration and Operation of Image Forming Apparatus Main Body> FIG.
The image forming apparatus main body 11 illustrated in FIG. 1 is an electrophotographic image forming apparatus, and is provided with an image forming unit 13, a feeding / conveying unit 14 for the recording material P, and a fixing unit 15.

The image forming section 13 includes a photosensitive drum 16 that is driven to rotate in the direction of arrow a, and a primary charger 17, an exposure device 18, and a developing device that are disposed around the photosensitive drum 16 in the rotation direction. The apparatus includes a device 20, a transfer charger 21, a cleaning device 22, and the like. The photosensitive drum 16 is formed by providing a photosensitive layer of, for example, an OPC (organic optical semiconductor) on the outer peripheral surface of a drum-shaped conductive base, and is formed in a predetermined direction in a direction of an arrow a by a driving unit (not shown). It is driven to rotate at the process speed (peripheral speed). The primary charger 17 is a charging roller (not shown) arranged in contact with the surface of the photosensitive drum.
And a charging bias applying power source (not shown) for applying a charging bias to the charging roller to uniformly charge the surface of the photosensitive drum 16 to a predetermined polarity and potential. The exposure unit 18 exposes the charged surface of the photosensitive drum in accordance with image information, and removes the charge on the exposed portion to form an electrostatic latent image. The exposure unit 18 includes a laser scanner, a polygon mirror, a lens, and a reflection unit. It has a mirror (neither is shown) or the like. The developing device 20 includes a developing container (not shown) containing a developer (toner), a developing roller (not shown) that carries the toner in the developing container on its surface and transports it to a developing unit, A developing bias is applied to the roller to
And a developing bias applying power source (not shown) for applying toner to the electrostatic latent image on 6 and developing the toner image as a toner image. The transfer charger 21 is disposed so as to face the above-described photoconductor drum 16 and forms a transfer portion between the transfer charger 21 and the photoconductor drum 16. A transfer bias is applied to a transfer charger 21 by a transfer bias application power source (not shown) on a recording material P such as paper supplied to a transfer unit from a feeding / conveying unit 14 to be described later. The upper toner image is electrostatically transferred. The cleaning device 22 has a cleaning blade (not shown) for removing toner (residual toner) remaining on the surface of the photosensitive drum 16 without being transferred to the recording material P at the time of transfer.

The feeding / conveying section 14 includes, in order from the upstream side in the conveying direction of the recording material P in the conveying path of the recording material P, a sheet feeding cassette 23, a sheet feeding roller 24, a conveying roller pair 25, a registration roller pair 26, It has a roller pair 27. The paper feed cassette 23 stores a large number of recording materials P on which toner images are formed. The paper feed roller 24 feeds the recording material P in the paper feed cassette 23 one by one, and the transport roller pair 25 feeds the fed recording material P to the registration roller pair 2.
6 is conveyed. Registration roller pair 26
Is the recording material P transported by the transport roller pair 25.
Is temporarily stopped, and then the photosensitive drum 16
The recording material P is supplied to the transfer unit so that the timing is synchronized with the timing of the upper toner image. Paper ejection roller pair 27
Is disposed above the left side wall (one side surface) 11 a of the image forming apparatus main body 11, and the recording material P having the toner image fixed on the surface thereof by a fixing unit 15 described below is transferred to the outside of the image forming apparatus main body 11. To the left.

The fixing section 15 has a fixing roller 28 having a heater inside, and a pressure roller 30 pressed by the fixing roller 28 to form a fixing nip.
In the above-described image forming section 13, the recording material P on which the toner image has been transferred to the surface is heated and pressed while being nipped and conveyed by the fixing nip so that the toner image is melted and fixed on the surface and fixed. It has become.

The image forming apparatus main body 11 having such a configuration,
That is, as described above, the image forming unit 13, the feeding / conveying unit 14,
Image forming apparatus main body 11 provided with fixing unit 15
, The primary charging, exposure,
A toner image is formed on the surface of the photosensitive drum 16 by development. On the other hand, the recording material P is supplied from the paper feed cassette 23 to the transfer unit in synchronization with the toner image on the photosensitive drum 16 by the paper feed roller 24, the transport roller pair 25, and the registration roller pair 26. Then, the transfer charger 21 transfers the toner image on the photosensitive drum 16 to the supplied recording material P. The toner image is fixed on the surface of the recording material P after the transfer of the toner image by the fixing unit 15, and then discharged to the outside of the image forming apparatus main body 11 by the discharge roller pair 27. Thus, the image formation by the image forming apparatus main body 11 is completed.

In the present embodiment, the recording material P discharged to the outside of the image forming apparatus main body 11 by the discharge roller pair 27 is supplied to the recording material post-processing device 12 as described later. Has become.

The image forming apparatus main body 11 has a rectangular parallelepiped outer shape, and has four legs 31 as a whole.
(However, only two are shown in FIG. 1). The four legs 31 are attached to four corners of the bottom surface (lower surface) 32 of the main body frame of the image forming apparatus main body 11, respectively. These leg portions 31 are, for example, screw members 31a (FIG. 2) screwed into the main body frame from below.
Lock member 3 for locking the screw member 31a.
1b, and the level of the screw member 31a, that is, the amount of protrusion from the bottom surface 32 is appropriately adjusted and locked by the lock member 31b, so that the entire image forming apparatus main body 11 is kept horizontal. It has become.

<Configuration and Operation of Recording Material Post-processing Apparatus> FIG.
The recording material post-processing device 12 performs a punching process (perforation) or a staple process on the recording material P, and after the image (toner image) is formed by the image forming apparatus main body 11 described above. This is a so-called finisher that performs these processes on the recording material P. Hereinafter, the finisher 12 will be referred to as the recording material post-processing device 12.

As shown in FIG. 2 (an enlarged view of the finisher 12 in FIG. 1), the finisher 12 includes a rectangular parallelepiped housing 33. In the upper part of the right side wall (opposing surface facing the left side wall 11a of the image forming apparatus main body 11) 33a of the housing 33, the entrance of the recording material P at a position corresponding to the discharge roller pair 27 of the image forming apparatus main body 11 side. 34 are provided. The right side wall 33a is
The portion having the upper entrance 34 protrudes rightward, and a space R is formed below the protruding portion.
The carry-in entrance 34 is formed by two upper and lower guide plate pairs, and the guide plate pairs are arranged such that the inlet side is wide and the downstream side (downstream along the recording material conveyance direction) becomes narrower. I have. Downstream of the carry-in port 34, a punching means (post-processing means) 35 for punching a recording material P is provided. Further, a curl correcting means (decurling unit) 38 comprising two pairs of curl removing rollers 36 and 37 for correcting the curl (curvature) of the recording material P is provided downstream of the punch processing means 35. ing.

A transport roller pair 40 is disposed downstream of the curl correcting means 38. A branch portion is provided immediately downstream of the pair of transport rollers 40, and a first transport path 41 extending upward at the branch portion and a second transport path extending downward at the branch portion.
And the transfer path 42 is branched. A flapper 43 that is switched by a solenoid (not shown) is provided at the branch portion. The flapper 43 is disposed between a first position for guiding the recording material P toward the first transport path 41 and a second position for guiding the recording material P toward the second transport path 42 in response to ON / OFF of the solenoid. Can be switched with.

The above-mentioned first transport path 41 is formed to extend obliquely upward from the branch portion, and a paper discharge roller pair 44 is provided at the most downstream side thereof. On the downstream side of the discharge roller pair 44, a first discharge tray 4 supporting the recording material P discharged from the discharge roller pair 44 from below.
5 are provided. It should be noted that the first discharge tray 45
On the upper side, both the recording material P that has been punched by the above-described punching means 35 and the recording material P that has not been punched after the image formation are discharged. That is, the recording material P that is not stapled is discharged regardless of the presence or absence of the perforation processing. Each roller described above,
That is, at least one of the curl removing roller pairs 36 and 37, the transport roller pair 40, and the paper discharge roller pair 44 is driven to rotate by a driving unit (not shown).

The second transport path 42 extends from the branch section to the recording medium receiving table 46 after branching downward from the first transport path 41. Second transport path 42
, Four carry-in roller pairs 47a, 47b, 47c, 47d are arranged in order from the upstream side (in order from the top), and three flappers 48a, 48 swingable therebetween.
b, 48c are provided. These are appropriately selected according to the length of the recording material P used for image formation in the transport direction. Here, with respect to the positions of the flappers 48a, 48b, and 48c, a position where the recording material P is transported further downstream of the second transport path 42 than the respective flappers is an open position (a position indicated by a solid line in FIG. 2). In contrast, the position at which the recording material P is carried into the recording material receiving table 46 by the respective flapper is determined as the closed position (the position indicated by the broken line in FIG. 2). Further, four types of recording materials P1 to P4 having different lengths in the transport direction are used as the recording materials P used for image formation. What is recording material P1?
A3 size transversal in S (420 m length in the transport direction)
m), the recording material P2 is also a B4 size transversal (length in the transport direction 362 mm), and the recording material P3 is also an A4 size transversal (297 mm in the transport direction). Is also an A4 size vertical thread (length in the transport direction 210 mm). That is, the length in the transport direction (hereinafter, appropriately referred to as “length”) is P1.
>P2>P3> P4.

When the recording material P conveyed to the second conveyance path 42 is the longest recording material P1, the flapper 48a on the most upstream side (uppermost portion) is arranged at the closed position. Then, the carry-in roller pair 47a is rotationally driven to guide the recording material P1 onto the recording material receiving table 46 by the flapper 48a. Similarly, in the case of the recording material P2 having the second longest length, the flapper 4
8a is placed in the open position, the flapper 48b is placed in the closed position, and the pair of carry-in rollers 47a, 47b is driven to rotate to cause the recording material P2 to move.
Is guided onto the recording material receiving table 46 by the flapper 48b.
Similarly, in the case of the recording material P3 having the third longest length, the flappers 48a and 48b are arranged at the open position and the flapper 48c is arranged at the closed position, and the carry-in roller pairs 47a, 47b and 47c are rotated to drive the recording material P3. Is guided onto the recording material receiving table 46 by the flapper 48c. In the case of the recording material P4 having the fourth longest length (the shortest), the flapper 48 is used.
a, 48b, and 48c are all arranged at the open position, and all the carry-in roller pairs 47a, 47b, 47c, and 48d are rotationally driven to transfer the recording material P4 along the second transport path 42 to the recording material receiving table 46. Guide up. As described above, the four types of recording materials P1 to P4 having different lengths in the transport direction are transported from the second transport path 42 onto the recording material receiving table 46 by appropriate flappers, respectively, so that they are loaded. Recording material P
Is the recording material P already placed on the recording material receiving table 46.
, The so-called undercut can be effectively prevented.

The recording material receiving table 46 is a flat plate member that is disposed to be inclined downward, and a predetermined number of recording materials P successively carried in through the second conveyance path 42 are received. It is temporarily stored as a recording material bundle. A hook-shaped receiving member 50 for receiving the end of the recording material P stocked by the recording material receiving table 46 from below is disposed near the lower end of the recording material receiving table 46. The receiving member 50 is fixed to an endless belt 53 which is stretched over a driving pulley 51 disposed near the upper end of the recording material receiving table 46 and a driven pulley 52 disposed near the lower end of the recording material receiving table 46. Have been. The receiving member 50 is moved upward along the recording material receiving base 46 by the counterclockwise rotation of the endless belt 53 in FIG. The recording material bundle stocked above can be moved upward. The receiving member 50 is configured to return to the home position shown in FIG. 2 by the clockwise rotation of the endless belt 53 in FIG.

On the back side of the recording material receiving table 46, the recording material P
Are provided. The aligning means 54 includes a pair of width shift plates 55 and a width shift plate 55 that face each other at an appropriate interval in a width direction (a direction perpendicular to the conveying direction) of the recording material P stocked on the recording material receiving table 46. A width shifting mechanism 56 that reciprocates in the width direction of the recording material P near the left and right ends of the recording material P is provided. The width shifting mechanism 56 can change the amount of reciprocating movement of the width shifting plate 55 in accordance with the width of the recording material P. Thus, the width shift plates 55 can be brought into contact with the left and right ends of the recording materials P having different widths, which are stocked on the recording material receiving table 46, and can be aligned.

In the vicinity of the lower end of the recording material receiving table 46, a stapler 57 is provided. The stapler 57 is for stapling a recording material bundle whose end is received from below by the above-described receiving member 50, is stocked on the recording material receiving table 46, and is aligned by the alignment means 54.

A discharge path 58 for the recording material P, which extends diagonally upward, is provided above the uppermost part of the recording material receiving table 46. A discharge roller pair 60 is disposed at the most downstream side of the discharge path 58.
Are arranged. The discharge roller pair 60 discharges the recording material bundle carried into the discharge path 58 by the above-described receiving member 50 onto the stacking surface 61a of the discharge tray 61 on the downstream side.

The discharge tray 61 is provided so as to be able to move up and down along a left side wall (a surface farther from the image forming apparatus main body 11) 33 b of the housing 33 by means of an elevating means 62. The lifting / lowering means 62 includes a driving pulley 63 and a driven pulley 64 provided at the upper end and the lower end of the left side wall 33b, respectively.
And a tray elevating belt 65 laid over these,
An electric motor 66 for rotating the driving pulley 63 forward and backward. The discharge tray 61 is provided with a tray elevating belt 65.
Attached to. The discharge tray 61 descends with the forward rotation of the electric motor 66 along with the driving pulley 63 and the tray lifting / lowering belt 65 in the counterclockwise direction in FIG. The belt 65 for raising and lowering the tray rises clockwise in FIG. Note that a recording material bundle detection sensor (not shown) is arranged near the recording material loading surface 61a of the paper discharge tray 61 in FIG. The recording material bundle detection sensor detects the height position of the recording material loading surface 61a of the discharge tray 61 in a state where the recording material bundle is not loaded, or the highest position of the recording material bundle in a state where the recording material bundle is loaded. Is to detect the height position of. That is, the above-described electric motor 66 is turned on / off based on the detection result of the recording material bundle sensor, whereby the height position of the recording material stacking surface 61a or the uppermost height position of the recording material bundle is set. Keep constant,
By keeping the falling height of the recording material bundle discharged from the paper discharge roller pair 60 constant, the recording material bundle can be received on the recording material stacking surface 61 or the already stacked recording material bundle in a good posture. Like that.

The finisher 12 having the above-described configuration is used to determine whether the recording material P on which an image has been formed by the above-described image forming apparatus main body 11 is subjected to punch processing (perforation processing) by the punch processing means 35 as follows. , And whether or not stapling is performed by the stapler 57 can be appropriately selected as needed.

The recording material P on which an image has been formed by the image forming apparatus main body 11 is transferred to a pair of discharge rollers 27 on the upper portion of the left side wall 11a.
Is discharged in the lateral direction (left direction) toward the finisher 12. The discharged recording material P is first placed in the finisher 1
It is carried into the carry-in entrance 34 above the right side wall 33a. Next, the recording material P requiring the punching process is temporarily stopped, and the punching process is performed by the punching unit 35. The curl of the lower and upper curls of the recording material P after the punch processing is corrected by the pair of curl removing rollers 36 and 37 of the curl correcting means 38. On the other hand, the recording material P that does not require punching is directly conveyed to the curl correcting means 38 without being temporarily stopped, and the curl in the lower and upper directions is similarly corrected.

The recording material P whose curl has been corrected in this way is
The sheet is conveyed to the branch by the conveying roller pair 40. Here, the recording material P that does not need to be stapled is conveyed along the first conveyance path 41 by the flapper 43 switching the path of the recording material P to the upper first conveyance path 41 side. The paper is discharged onto the paper discharge tray 45 by the pair 44.
On the other hand, the recording material P that requires stapling is the flapper 4
3 switches the path of the recording material P to the lower second conveying path 42 side. As a result, the recording material P is conveyed along the second conveyance path 42, and is transferred from the second conveyance path 42 to the recording material receiving table 4.
6, one end is received by the receiving member 50, and further aligned by the alignment means 54,
The recording material is temporarily stocked on the receiving tray 46. In addition,
The carry-in roller pair and the flapper used when the recording material P is carried in from the second conveyance path 42 onto the recording material receiving table 46 depend on the length of the recording material P in the conveyance direction, that is, the recording material P
Is selected from the carry-in rollers 47a, 47b, 47c, 47d and the flappers 48a, 48b, 48c according to which of the recording materials P1 to P4. The stock of the recording material P by the recording material receiving table 46 is continued until the number of the recording materials P reaches a predetermined number to be stapled.

When the number of recording materials P on the recording material receiving table 46 reaches a predetermined number and a desired bundle of recording materials is formed, a stapling process is performed by the stapler 57.

After the staple processing, the driving pulley 51 is rotated counterclockwise to rotate the endless belt 53 in the same direction, so that the receiving member 50 integrated with the endless belt 53 receives the recording material. By ascending along the table 46, it is moved upward and guided to the discharge path 58.
The recording material bundle moved along the discharge path 58 in this way is discharged by the discharge roller pair 60 to the stacking surface 61 of the discharge tray 61.
a.

Thus, the post-processing for the recording material P by the finisher 12 is completed.

The recording material conveyance speed of the recording material conveyance system including the curl correcting means 35 in the finisher 12 is as follows.
In the image forming apparatus main body 11. The speed is set to be higher than the recording material conveyance speed of the recording material conveyance system including the paper discharge roller pair 27.

<Shaft Member Support Structure and Its Operation> FIG.
The following shows a support structure for a shaft member according to the present invention. In the following, a case where the shaft member is a camshaft will be described as an example, but the present invention is not limited to this, and can be similarly applied to a wide and general shaft member.

The cam shaft 81 as a shaft member is rotatably and axially slidably supported by a bearing 82 disposed on the left end side and a bearing 83 disposed on the right end side. The bearings 82 and 83 are fixed to the housing 33 described above. A central portion in the longitudinal direction of the cam shaft 81,
That is, five cam members 84, 85, 86, 87, and 88 are fixed between the bearing 82 and the bearing 83 in order from the left. Each of the cam members 84 to 88 has a boss 84
a, 84b, 84c, 84d, 84e and eccentric cam surfaces 84a, 84b, 84c, formed at one end thereof.
84d and 84e. These cam members 84-
Below 88, punch members 90, 91, 9 on a cylinder are provided.
2, 93, 94 are supported by a guide member (not shown) so as to be able to ascend and descend with the blade portion facing downward. A pin hole 81 penetrating in the radial direction and long in the axial direction is formed in the cam shaft 81 near the bearing 83 described above. A large diameter portion 81b is formed at the right end of the cam shaft 81, and a sleeve 95 as a pipe member is loosely fitted inside the large diameter portion 81b.

The sleeve 95 has a left end portion having the bearing 83 described above.
, And the right end is rotatably supported by another bearing 96. Sleeve 95
The pin hole 81a of the cam shaft 81 is
Are penetrated at both ends of the pin 97. The camshaft 81 described above is formed by the pin holes 81a and the pins 97.
Are non-rotatable relative to the sleeve 95 and slidable in the axial direction. A large-diameter portion 95a is formed at the right end of the sleeve 95, and a compression spring 98 is interposed between the sleeve 95 and the large-diameter portion 81b of the cam shaft 81 described above. The cam spring 81 is urged rightward with respect to the sleeve 95 by the compression spring 98. FIG. 7 shows a state in which the cam shaft 81 is moved to the left against the spring force of the compression spring 98.

The outer peripheral surface of the sleeve 85 has a drive gear 10
0 is loosely fitted between the drive gear 100 and the above-mentioned pin 97.
Is interposed. The spring clutch 101 includes the boss member 1
02, a collar 103, a spring 104, a solenoid (not shown), and the like. When the solenoid is turned on while the driving drive gear 100 is rotating, the spring clutch 101 operates the collar 103 to reduce the diameter of the spring 104,
As a result, the drive gear 100 and the boss member 102 are connected via the spring, and the two rotate together. When the boss member 102 rotates, the cam shaft 81 rotates via the pin 97 engaged with the boss member 102. At this time, the sleeve 95 also rotates integrally with the cam shaft 81.

At the left end of the cam shaft 81, a solenoid 1 is provided.
05 are connected. When this solenoid is turned on, the cam shaft 81 moves to the left against the spring force of the compression spring 98 and is located at the position shown in FIG. At this time, the cam surfaces 85b and 87b of the cam members 85 and 87 correspond to the punch members 91 and 93, respectively. On the other hand, when the cam shaft 1 is urged by the compression spring 98 by the turning off of the solenoid 5 and moved to the right, the cam surfaces 84b, 86b, 88b of the cam members 84, 86, 88 are pressed by the punches 90, 9 respectively.
2,94.

The state shown in FIG.
Is turned on and the camshaft 1 is moved to the left, and when the spring clutch 101 is turned on, the rotation of the drive gear 100 becomes
The power is transmitted to the cam shaft 81 via the spring clutch 101 and the pin 97, and the five cam members 90 to 94 are rotated. By this rotation, the cam surfaces 85b, 87 of the cam members 85, 87
The punch members 91 and 93 are actuated by b, whereby two punch holes are punched in a recording material such as paper. On the other hand, when the solenoid 105 is turned off, the cam shaft 81 is moved rightward by the compression spring 98, so that the cam surfaces 84b, 86 of the cam members 84, 86, 88 are formed.
b, 88b, the punch members 90, 92, 94
Is activated, and three punch holes can be made. The sliding amount of the cam shaft 81 (the moving amount in the longitudinal direction) is
It is determined by the axial length of the pin hole 81a drilled in the cam shaft 81 described above.

According to the above-described configuration, by selectively sliding the cam shaft 81 to the left and right by turning on / off the solenoid 105, the set of punch members to be operated is changed to the set of punch members 91 and 93. And the punch member 9
0, 92, 94 can be selectively switched.

As described above, the two bearings that directly support the cam shaft 81 are the bearing 82 and the bearing 83, and the bearings 82 and 83 are compared with the case where three conventional bearings are used. Since the arrangement can be performed coaxially with high accuracy, the sliding operation of the camshaft 81 by the solenoid 105 can be made smoother, unlike the related art. At this time, the portion of the camshaft 81 located on the right side of the bearing 83 is
Since the bearing 96 is indirectly supported via the sleeve 95, even when the number of the bearings directly supporting the camshaft 81 is two as described above, the accuracy of the rotation of the camshaft 81 can be improved. There is no risk of lowering. The camshaft 81
Include three bearings (the bearings 82, 8
3, 96), but this bearing 9
In the case of No. 6, appropriate clearances are secured at a total of two places between the cam shaft 81 and the sleeve 95 and between the sleeve 95 and the bearing 96, so that the bearings 82, which directly support the cam shaft 81, Compared with 83, even if a particularly high positional accuracy is not ensured, the slide operation of the cam shaft 81 is not hindered. That is, whether or not the sliding operation of the camshaft 81 is smooth mainly depends on the bearings (the bearings 82 and 83 in the present embodiment) that directly support the camshaft 81. Then, as described above, since there are two such bearings, compared to the conventional three bearings,
The sliding operation of the cam shaft 81 can be performed smoothly.

[0048]

As described above, according to the shaft member supporting structure of the present invention, by using two bearings for directly supporting the shaft member, these two bearings are precisely arranged coaxially. Therefore, the sliding operation of the shaft member can be made smooth.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an image forming apparatus according to the present invention.

FIG. 2 is a schematic configuration diagram of a finisher according to the present invention.

FIG. 3 is a vertical cross-section along an axis for explaining the overall configuration of a shaft member support structure according to the present invention.

FIG. 4 is a diagram schematically showing the overall configuration of a conventional shaft member support structure.

[Explanation of symbols]

81 cam shaft (shaft member), 82, 83 bearing 95
... Sleeves (pipe members), 84, 85, 86, 8
7, 88 ... cam member, punch member ... 90, 91, 9
2,93,94

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yasunori Ueno 1-2-28 Tamazo, Chuo-ku, Osaka-shi, Osaka Inside Kyocera Mita Co., Ltd. (72) Inventor Sadahiro Matsuura 1-2-2 Tamatsuzo, Chuo-ku, Osaka-shi, Osaka No. 28 Kyocera Mita Corporation F term (reference) 3C060 BA01 BC06 BG11 3F108 GA02 GB07 3J104 AA43 DA13 EA02

Claims (2)

[Claims] 1. A supporting structure for a shaft member, one end of which is inserted into a pipe member on which an on-off mechanism is provided, and which is connected to the pipe member so as to be non-rotatable and slidable in the axial direction. The shaft member is rotatably supported by bearings disposed at two different positions in the longitudinal direction, and the shaft member is rotatably supported by bearings disposed at two different positions in the longitudinal direction on the other end side without the pipe member. A support structure for a shaft member, which is supported so as to be slidable in the axial direction. 2. The camshaft according to claim 1, wherein the shaft member is a camshaft to which a plurality of cam members for operating a plurality of punch members arranged along a longitudinal direction are fixed, and the camshaft slides in the axial direction of the camshaft. The support structure for a shaft member according to claim 1, wherein the selection of the punch member to be operated is switched by moving the plurality of cam members.