JPH074454U - Clutch device for paper feeding - Google Patents

Abstract

(57) [Summary] [Purpose] In the paper feeding device loaded in the paper processing device,
It is an object of the present invention to reduce the size of a clutch device body used in a driving force transmission mechanism. [Structure] A clutch disc 30 is arranged adjacent to a drive disc 15 to which a driving force from a drive source 86 is input,
On the surface of the clutch disc 30 facing the drive disc 15, the clutch guide passage 31 for clutch on / off,
33 is provided. Further, the clutch disc 3 of the drive disc 15 is set so that the diameter of the drive disc 15 falls within the range of the diameter of the clutch disc 30.
A ratchet pawl 21 which is guided in sliding contact with the pawl guide passages 31 and 33 is provided on the side opposite to 0 so as to rotate in the axial direction.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a paper feeding clutch device used in a paper feeding device loaded in a paper processing device such as a printer and transmitting a driving force in only one direction to a paper feeding shaft to which a paper feeding roller is fixed.

[0002]

[Prior art]

 Generally, a printer, which is a paper processing device, is equipped with a paper feeding device that feeds paper to a printing unit so that printing can be performed on paper of various sizes. This paper feeding device is provided with a drive force transmission mechanism that transmits the drive force from the drive source on the printer side to the paper feed shaft to which the paper feed roller is fixed, and the stacked sheets stored in the stacker section are The paper feed roller is driven via the driving force transmission mechanism, and is separated one by one and conveyed to the printer side.

In this case, the paper feed roller is rotated in only one direction (hereinafter referred to as forward rotation) so that the paper is continuously fed to the printer side, and the rotation is stopped. Must be configured to. The rotation / stop of the paper feed roller is performed by a paper feed clutch device provided in a driving force transmission mechanism as disclosed in, for example, Japanese Utility Model Publication No. 3-17065. The configuration of the paper feed clutch device disclosed in this publication will be briefly described below.

The paper feed shaft to which the paper feed roller is fixed is provided with a drive disk for inputting a driving force from a drive source provided on the printer side for driving the platen, and a claw guide groove on the outer peripheral surface adjacent to the drive disk. Each formed clutch disc is rotatably mounted. A pin is provided on the circumference of the drive disk so as to project, and the pin is provided with a ratchet pawl that is pressed into sliding contact with a pawl guide groove formed on the outer peripheral surface of the clutch disk. .

The pawl guide groove includes a clutch-on pawl guide passage and a clutch-off pawl guide passage that are formed in parallel with the outer peripheral surface of the clutch disc. The clutch-on pawl inner passage has a window. A hole is formed. Both of these claw guide passages are partitioned by a partition wall extending along the claw guide groove. One end of this partition wall has a guide surface for guiding the ratchet pawl to the clutch-on pawl guide passage, and the other end thereof has a ratchet. Guide surfaces are formed to guide the pawls to the clutch-off pawl guide passages.

A drive gear, which is disposed inside the clutch disc and is engaged with the ratchet pawl through a window hole, is fixed to the paper feed shaft. When the drive disc rotates forward, the ratchet pawl is driven. It is designed to mesh with gears. That is, the drive force from the drive source is configured to be transmitted only when the ratchet pawl is guided to the clutch-on pawl guide passage to engage with the drive gear through the window hole and the drive disk rotates forward. Has been done.

[0007]

[Problems to be solved by the device]

 However, since the paper feed clutch device disclosed in the above publication is configured such that the ratchet pawl is in sliding contact with the pawl guide groove formed on the outer peripheral surface of the clutch disc, a drive to which the ratchet pawl is attached is attached. The outer diameter of the disc must be larger than the outer diameter of the clutch disc. Therefore, there is a problem that the outer diameter of the clutch device body is increased.

The present invention has been made to solve the above-mentioned problems, and reduces the outer diameter of the drive disk to which the ratchet pawl is attached, thereby reducing the size of the clutch device body used in the paper feeding device. The purpose is to

[0009]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, a paper feeding clutch device of the present invention comprises a drive disk rotatably mounted on a paper feeding shaft of a paper feeding unit and a rotation of the drive disk adjacent to the drive disk on the paper feeding shaft. A clutch disc that is movably attached and has a pawl guide formed on a surface facing the drive disc; and a drive gear that is fixed to the paper feed shaft adjacent to the clutch disc. On the drive disc, a ratchet pawl that is in sliding contact with the pawl guide portion of the clutch disc and is locked to the drive gear during normal rotation of the drive disc through a window hole formed in the pawl guide portion rotates in the axial direction. The pawl guide is provided with a clutch-on pawl guide passage in a portion that passes through the window hole and a clutch-off pawl guide passage in a portion that does not pass through the window hole. These pawl guide passages are defined by a partition wall projecting in the axial direction, and guide the ratchet pawl to the clutch-on pawl guide passage at one end and the ratchet pawl at the other end. Clutch off claw It is characterized by having a guide surface that guides to the guide passage.

[0010]

[Action]

 A clutch disc is arranged adjacent to the drive disc to which the driving force from the drive source is input, and a clutch on / off pawl guide portion is provided on a surface of the clutch disc facing the drive disc. On the other hand, a ratchet pawl that is slidably guided by the pawl guide is provided on the side of the drive disc facing the clutch disc so as to rotate in the axial direction. As a result, the diameter of the drive disk is controlled within the range of the diameter of the clutch disk, and the size of the paper feeding clutch device is reduced.

[0011]

【Example】

 FIG. 1 is a partially cutaway plan view showing a state in which a sheet feeding device having a sheet feeding clutch device according to an embodiment of the present invention is loaded in a printer, and FIG. FIG. 3 is a perspective view showing a driving force transmission mechanism with respect to a computer.

In the figure, reference numeral 1 indicates a sheet feeding device. The paper feeding device 1 is loaded in the printer 80 by a connecting means (not shown). A paper feed shaft 3 is rotatably supported by the left and right plates 2a and 2b of the frame body 2 of the paper feed device 1, and a pair of paper feed rollers 5 is attached to the paper feed shaft 3. . One end of the paper feed shaft 3 projects from the side plate 2a, and a drive force transmission mechanism 12 including a paper feed clutch device 10 is arranged on the projected portion. Further, the sheet feeding device 1 has a stacker section 6 for accommodating stacked sheets, and this stacker section 6 is rotatably supported between the left and right side plates 2a and 2b, and stacks the stacked sheets. A pressing plate 7 for urging toward the sheet feeding roller 5 and a pair of guide plates 8 (only one of which is shown) provided on the surface of the pressing plate 7 and defining both sides of the laminated paper are provided. There is.

The driving force transmission mechanism 12 has gear trains 13 a to 13 c rotatably supported by the frame body 2, and when the paper feeding device 1 is loaded into the printer 80, the input gear 13 a of the gear train. Is in a state of meshing with the platen gear 85 attached to the platen shaft 82a of the platen 82. Further, the platen gear 85 is meshed with the output gear 87 of the drive source 86 provided on the printer side. As a result, the platen 82 is driven by the drive source 86 in the normal / reverse rotation direction, and The driving force is transmitted to the paper feed shaft 3 via the gear trains 13a to 13c and the paper feed clutch device 10.

Next, the configuration of the paper feed clutch device 10 provided in the driving force transmission mechanism 12 will be described with reference to FIGS. 1 to 3. The paper feed clutch device 10 is rotatably supported on the outermost side of the paper feed shaft 3 and is rotatably arranged inside the drive disc 15 and a drive disc 15 that meshes with the output gear 13c of the gear train. A clutch disk 30, a drive gear 50 disposed inside the clutch disk 30 and fitted into a D-shaped cross-section protruding portion 3a formed on the paper feed shaft 3, a drive gear 50 and the paper feed shaft 3 And a one-way bearing 60 disposed between the two. In the figure, arrow A indicates the forward rotation direction in which the paper is sent out.

A support member 17 is provided on the boss 16 of the drive disk 15 along the radial direction, and a pin 18 is projectingly provided on the support member 17. The pin 18 has a ratchet pawl 21 directed toward the clutch disc 30 rotatably supported in the axial direction. The ratchet pawl 21 is biased toward the clutch disc 30 by an urging member 20. Energized.

A pawl guide portion for the ratchet pawl 21 is formed on the surface of the clutch disc 30 on the drive disc 15 side, and the ratchet pawl 21 is attached to the pawl guide portion as the drive disc 15 rotates. Be guided along. The structure of the claw guide portion of the clutch disk 30 will be described below.

The claw guide portion includes a clutch-on guide surface 31 for transmitting a driving force and a clutch-off guide surface 33. As shown in FIG. 3, the clutch-on guide surface 31 is composed of a surface 31a and a surface 31b formed so as to continuously rise from the surface 31a in the reverse rotation direction of the outer circumferential ring portion. A window hole 32 is formed between the surface 31a and the surface 31b. On the other hand, the clutch-off guide surface 33 is formed on the inner peripheral side of the clutch-on guide surface 31, and has a surface 33a lower than the end region of the above-mentioned surface 31b and a circumferential inner ring portion from this surface 33a. And a surface 33b formed so as to continuously rise in the normal rotation direction. The end region of the surface 33b is higher than the surface 31a.

A partition wall 35 projecting in the axial direction is formed between the clutch-on guide surface 31 and the clutch-off guide surface 33. The partition wall 35 divides the surface 31b and the surface 33b so that the ratchet pawl 21 does not move from the surface 33b to the surface 31b or fall into the window hole 32.

As a result, when the drive disk 15 is rotated in the reverse direction when the ratchet pawl 21 is in the area of the surface 31a, the ratchet pawl 21 is guided in the order of the surface 31a-the window hole 32-the surface 31b-the surface 33a. Then, when the ratchet pawl 21 is in the area of the surface 33a, the ratchet pawl 21 is surely guided in the order of the surface 33a-the surface 33b-the surface 31a when the drive disk 15 is normally rotated.

A first origin indexing stopper 37 is formed on the clutch disk 30 between the surface 31a and the surface 33a in the radial direction, and when the drive disk 15 is rotated in the normal direction, the ratchet pawl is provided. The front end side of 21 can be engaged with the first origin indexing stopper 37. Further, the outer peripheral portion of the clutch disc 30 is configured in a spiral shape, and at the first origin indexing stopper 37 portion, a second origin indexing stopper protruding toward the drive disk 15 side. 39 is formed. Then, when the drive disk 15 is reversely rotated, the rear end side of the ratchet pawl 21 can be engaged with the second origin indexing stopper 39. As described above, by providing the origin indexing stoppers 37 and 39, the initial position of the paper feed clutch device 10 can be reliably set.

The drive gear 50 has an engagement surface 55 formed on the outer circumferential ring portion facing the clutch disc 30 side. Then, in the state where the center hole 40 of the clutch disc 30 is fitted into the boss 51 of the drive gear 50, the window hole 32 of the clutch disc and the engagement surface 55 have a corresponding relationship. As a result, the ratchet pawl 21 can be engaged with the engagement surface 55 of the drive gear 50 through the window hole 32. The engagement surface 55 is formed so as to rotate the drive gear 50 forward when the drive disk 15, that is, the ratchet pawl 21 rotates forward. That is, when the drive disk 15 rotates in the reverse direction, the ratchet pawl 21 is disengaged from the engagement surface 55.

As described above, the driving force from the driving source 86 provided in the printer is transmitted to the drive disk 15 via the gear trains 13a to 13c, but by the operation of the paper feeding clutch device 10 described above, Only the driving force necessary for the paper feeding operation is transmitted to the paper feed shaft 3. In this case, the excessive rotation of the clutch disc 30 due to the inertia is prevented by the brake device 14 provided on the frame side plate 2a. In the operation of the paper feed clutch device 10 described above, for setting the initial position of the paper feed clutch device 10, guiding the ratchet pawl 21 to the clutch-on guide surface 31 and the clutch-off guide surface 33, and the like, The drive source 86 on the printer side is rotated in the forward and reverse directions. The drive of the drive source 86 in the normal and reverse directions is performed by the control means 90 having a predetermined program.

Next, the operations of the sheet feeding device 1 and the printer 80 including the sheet feeding clutch device 10 configured as described above will be described. (1) First, when the switch of the printer 80 is turned on, the control means 90 causes the drive source 86 to print, for example, 15 print lines, that is, the drive disk 15 is operated via the gear trains 13a to 13c. A reverse rotation command is given so that it can be rotated 360 degrees in the reverse direction. As a result, the rear end side of the ratchet pawl 21 is securely engaged with the second origin indexing stopper 39 of the clutch disc 30. The state of the ratchet pawl 21 at this time is shown by the line B in FIG. That is, even if the ratchet pawl 21 is located at the position indicated by (a) in FIG. 4A, the drive disk 15 is rotated in the reverse direction by about 360 °, so that the ratchet pawl 21 has the surfaces 31a to 31b to 33a. It is guided by sliding contact with and finally comes to the position shown by B.

If the rear end side of the ratchet pawl 21 engages with the second origin indexing stopper 39 by the time the drive disk 15 rotates in the reverse direction of about 360 °, the clutch disk 30 and the drive disk 15 will be separated from each other. The reverse rotation is performed as a unit, and then, the rear end side of the ratchet pawl 21 stops with the second origin indexing stopper 39 still engaged. Further, the ratchet pawl 21 may fall into the window hole 32 of the clutch disc 30 before the drive disc 15 reversely rotates by about 360 °, but the engagement surface 55 of the drive gear 50 is shown in FIG. 5 (b). Since the ratchet pawl 21 is formed as described above, the ratchet pawl 21 is disengaged from the window hole 32 without being caught by the engagement surface 55. (2) Next, the control means 90 causes the drive source 86 to rotate, for example, 15 print lines, that is, the drive disk 15 is positively rotated about 360 ° through the gear trains 13a to 13c. Give a forward rotation command. Then, in the above step (1), the ratchet pawl 21 located at the position indicated by (b) in FIG. 4 (a) is guided by sliding contact from the surface 33a to the surface 33b, as shown in FIG. 4 (b). It In this case, the ratchet pawl 21 is surely brought into sliding contact with the surface 33b by the shapes of the clutch-on guide surface and the clutch-off guide surface and the partition wall 35 formed between them, as shown in FIG. 4 (c). Be guided. Then, the ratchet pawl 21 finally stops at a position shown by a in FIG. 4A, that is, in a state where the tip end side of the ratchet pawl 21 is engaged with the first origin indexing stopper 37. .

As described above, when the switch of the printer 80 is turned on by the steps (1) and (2), the initial position of the paper feed clutch device 10 is reliably set. (3) When the initial position of the paper feed clutch device 10 is set, the control means 90 gives the drive source 86 a reverse rotation command corresponding to, for example, seven print lines. As a result, the drive disk 15 is reversely rotated via the gear trains 13a to 13c. The seven print lines correspond to the angle from the position of the first origin indexing stopper 37 to the position of the window hole 32 of the ratchet pawl 21. That is, the reverse rotation of the drive source 86 causes the ratchet pawl 21 to slide on the surface 31a from the position indicated by a in FIG. 4A in the reverse rotation direction to reach the position indicated by C. At this time, the ratchet pawl 21 is in a state of being engaged with the engagement surface 55 of the drive gear 50 through the window hole 32, that is, in a clutch-on state, as shown in FIG. (4) Next, the control means 90 gives a normal rotation instruction to the drive source 86. As a result, the drive disk 15 is normally rotated via the gear trains 13a to 13c. In the step (3), the ratchet pawl 21 is engaged with the engaging surface 55 of the drive gear 50, and the forward rotation of the drive disk 15 causes the drive gear 50 to move as shown in FIG. Is also rotated integrally. That is, the driving force is transmitted to the paper feed shaft 3 and the paper feed roller 5 rotates forward. As a result, the laminated sheets placed on the pressing plate 7 are separated into one sheet and fed out, and conveyed to the printer 80 side.

The normal rotation command from the control means 90 to the drive source 86 is stopped when a sensor (not shown) arranged immediately in front of the platen 82 detects the leading edge of the sheet and a predetermined time elapses. . At this time, the leading edge of the sheet is held between the platen 82 and a pinch roller (not shown) that abuts against the platen 82, and the trailing edge of the sheet is the sheet feeding roller of the sheet feeding device 1 side. 5 is in contact with (5) After the drive source 86 is stopped, the control unit 90 gives the drive source 86 a reverse rotation command corresponding to, for example, four print lines. As a result, the drive disk 15 is rotated in the reverse direction via the gear trains 13a to 13c. At this time, the ratchet pawl 21 is disengaged from the window hole 32 of the clutch disc 30, guided by sliding contact from the surface 31b to the surface 33a, and comes to the position shown in FIG. 5 (c). Of course, when the ratchet pawl 21 is disengaged from the window hole 32, the clutch is turned off, and the driving force of the driving source 86 is not transmitted to the paper feeding shaft 3.

When the drive source 86 is driven in the reverse direction, the platen 82 is rotated in the reverse direction. Therefore, the leading edge side of the paper gripped between the platen 82 and the pinch roller (not shown) that abuts on the platen 82. Are returned to the side of the sheet feeding device 1. At this time, since the trailing edge of the sheet is in contact with the sheet feeding roller 5, the sheet is bent. As a result, the leading edge of the sheet is aligned with the tangent line between the platen 82 and the pinch roller that contacts the platen 82, and the skew is removed. (6) When the skew removal operation is completed, the control means 90 gives the drive source 86 a forward rotation command until the paper reaches the printing position, and the drive disk 15 is forwarded via the gear trains 13a to 13c. Rotate. At this time, as shown in FIGS. 4B to 4C, the ratchet pawl 21 is guided by sliding contact from the surface 33a, which is the guide surface for clutch-off, to the surface 33b, and finally through the surface 31a. It is in a state of being engaged with the origin index stopper 37. Of course, in this operation, the driving force of the driving source 86 is not transmitted to the paper feed shaft 3.

At this time, the sheet is conveyed by the normal rotation of the platen 82, and the sheet feeding roller 5 abutting on the trailing edge side of the sheet is in a state of being rotated together with the sheet conveying operation. When the paper feed roller 5 is rotated together, the one-way bearing 60 is arranged between the drive gear 50 and the paper feed shaft 3 as described above, so that no load is applied from the paper feed clutch device side. No paper is added, and the paper is stably conveyed. (7) After the paper is conveyed to the printing position, the control means 90 gives the drive source 86 a forward rotation command of the paper feeding operation synchronized with the printing operation. Then, after the printing on the paper is completed, the paper is discharged to a stacker (not shown), and one step of printing the paper is completed. Even after the ratchet pawl 21 is engaged with the first origin indexing stopper 37 in the step (6), the drive source 86 is normally driven by the steps (6) and (7). ing. In this case, since the tip end side of the ratchet pawl 21 remains engaged with the first origin indexing stopper 37, the clutch disc 30 is idling together with the drive disc 15.

At the end of one step of printing the paper, the tip end side of the ratchet pawl 21 is in the initial setting position in the state of being engaged with the first origin indexing stopper 37, and therefore, the above (3) to (7) By repeating the above process, it is possible to continuously feed the paper and perform continuous printing.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-mentioned embodiments and can be variously modified. For example, the shape of the guide portion of the ratchet pawl formed on the clutch disc is not limited to the above-described embodiment, but can be variously modified. Further, in the embodiment of the present invention, the origin index stoppers are formed on the clutch disk so that the initial position of the paper feeding clutch device can be set with certainty. Also, it is possible to appropriately change.

[0031]

[Effect of device]

 As described above, according to the present invention, the diameter of the drive disc to which the driving force from the drive source is input can be controlled within the range of the diameter of the clutch disc. Can be achieved.

[Brief description of drawings]

FIG. 1 is a partially cutaway plan view showing a state in which a paper feeding device having a paper feeding clutch device according to the present invention is loaded in a printer.

FIG. 2 is a perspective view showing a driving force transmission mechanism between a sheet feeding device and a printer.

FIG. 3 is an exploded perspective view of a paper feeding clutch device according to the present invention.

4A to 4C are front views showing the relationship between a pawl guide portion formed on the clutch disc and a ratchet pawl that is slidably guided by the pawl guide portion.

5A and 5B are side views of a paper feed clutch device, and FIG. 5C is a front view thereof.

[Explanation of symbols]

1 ... Paper feeding device, 3 ... Paper feeding shaft, 5 ... Paper feeding roller, 10 ...
Clutch device for paper feed, 15 ... Drive disk, 30
... clutch disk, 21 ... ratchet pawl, 31 ... clutch-on guide surface, 32 ... window hole, 33 ... clutch-off guide surface, 35 ... partition wall, 37 ... first origin indexing stopper, 39 ... second Origin indexing stopper, 50 ... Drive gear, 55 ... Engaging surface, 60 ... Unidirectional bearing, 80 ...
Printer, 82 ... Platen, 86 ... Driving source.

Claims (2)

[Scope of utility model registration request] 1. A drive disc rotatably attached to a paper feed shaft of a paper feeding unit, and a rotatably attached to the paper feed shaft adjacent to the drive disc,
And a clutch disc having a claw guide portion formed on a surface facing the drive disc, and a drive gear fixed to the paper feed shaft adjacent to the clutch disc. A ratchet pawl that is in sliding contact with the pawl guide portion of the disc and is locked to the drive gear at the forward rotation of the drive disc through a window hole formed in the pawl guide portion is provided so as to rotate in the axial direction. The pawl guide portion includes a clutch-on pawl guide passage in a portion that passes through the window hole and a clutch-off pawl guide passage in a portion that does not pass through the window hole, and these both pawl guide passages project in the axial direction. The ratchet pawl is guided to the clutch-on pawl guide passage at one end, and the ratchet pawl is clutch-off at the other end. And a guide surface for guiding the nail guide path, the paper feed clutch unit, characterized in that. 2. The claw guide portion of the clutch disc includes:
A first origin indexing stopper with which the tip side of the ratchet pawl comes into contact when the drive disk rotates in the forward direction is provided on the outer peripheral portion of the clutch disc. 2. The paper feed clutch device according to claim 1, wherein two origin indexing stoppers are formed respectively.