JPS60101326A - Clutch mechanism - Google Patents

Abstract

PURPOSE:To improve controllability, by a method wherein, in a unidirectional clutch mechanism, clutch coupling between a drive disc clutch and a clutch disc is properly effected by means of timing setting of the vibration position of a latch ball mounted to the one disc. CONSTITUTION:A drive disc 3, having a drive gear 5, a latch ball 6, and a positioning pin 7, and a clutch disc 4 are loosely engaged with a driven shaft 2, and a forward end 6a of the latch ball 6 is energized by a spring 9 so that it is forced into slide contact with an idling allowable zone I in the slide contact surface 4a of the disc 4. A pole deflecting part 10 is mounted in the said zone I of the disc 4. Said part 10 is formed with a slanted deflecting surface 10a by means of which a forward end 6a of a pole is vibrated toward a rotary transmission zone II side when the disc 3 is turned in a direction X. After the forward end 6a of the pole is engaged with a claw hole 11 in the zone II, when the disc 3 is in a direction Y, a driven shaft 2 is rotated through a one-way clutch.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a unidirectional clutch mechanism used as a rotation transmission mechanism.

A one-way clutch is usually used to apply rotation in only one direction to the driven shaft.

However, in this one-way clutch, in order to rotate the driven shaft intermittently forward only in one direction,
It is sufficient to use a commonly used ratchet mechanism, but when the clutch mechanism is reversely rotated and then rotated forward again, it is a problem if the driven shaft is rotated from the reverse rotation position to the forward rotation direction again. There are cases.

That is, this means that, for example, an office machine with a platen (
When feeding the next print paper to the automatic paper feeder of a printer (such as a printer) by rotating the platen in the opposite direction, after the print paper has been fed to a predetermined position, the platen must be rotated in the forward direction to feed the next print sheet. The paper must be pulled into the platen to the printing start position. If the rotation direction of the platen is forward rotation, it will be a problem if the next printing paper is sent out for printing, so in this case, the paper feed roller is kept non-rotating. .

However, since the clutch mechanism used for the purpose mentioned above rotates forward and reverse depending on the number of printed lines (the number of horizontal lines) in the printer, it is relatively large considering the accuracy of the clutch mechanism. However, it has the disadvantage that it is not compatible with the miniaturization of office machines such as printers.

On the other hand, as a conventional example, for example, Japanese Patent Publication No. 58-6633
As shown in the above publication, the clutch mechanism in this case is configured by simply switching the rotational direction of the transmission wheel, either reversely or forwardly, so the clutch can be engaged even when not necessary. The problem is that it is not fulfilled.

For example, in backline printing of a printer, when printing is performed at a preceding print position that exceeds the tolerance of a certain category of separate lines (such as the fan-shaped notch of the entraining disk), the printing cylinder (platen) is There is an inconvenience that when the rotation is reversed to the desired position, the clutch is engaged for the next sheet feeding and the sheet feeding starts.

■--This invention was made in view of the above, and its purpose is to provide a transmission mechanism that rotates a driven shaft intermittently in only one direction, in which the rotation of the drive side that rotates the driven shaft is It is an object of the present invention to provide a clutch having a mechanism for canceling unnecessary transmission of rotation on the driving side to the driven shaft side even if the clutch rotates in the clutch engagement direction.

Next, the present invention will be explained based on an embodiment shown in the drawings.

1 to 5, the clutch mechanism (1) consists of a drive disk (3) and a clutch disk (4) that are loosely mounted on a driven shaft (2).
) is provided with an l-live gear (5), a latch ball (6), and a positioning pin (7).

The latch ball (6) has a support shaft (8) that protrudes from the side of the drive disk (3) so that its tip (6a) is along the sliding surface (4a) of the clutch disk (4). shaft(
8) is held rotatably about the fulcrum.

A spring (9) is wound around the support shaft (8), and due to the elasticity of the spring (9), the tip (6a) side of the latch ball (6) is attached to the drive disk.
3) is biased toward the rotation center direction.

On the other hand, the latch ball (6) due to this spring (9)
In addition to the above, as is clear from Figure 2, elasticity is added to
The spring ( 9) is tilted in an oscillating manner.

This zone (1) is provided with a protruding ball turning portion (10) that the tip (6a) of the latch ball (6) can ride over without engaging.
) has an inclined turning surface (1) that allows the tip (6a) of the latch ball (6) to swing toward the rotation transmission zone (II) when the drive disk (3) rotates in the direction of the arrow (X).
0a) is provided.

In the above, the pole turning section (1
The tip (6a) of the latch ball (6) is located on the side of the latch ball (6).
) can fall along the turning surface (10a) (1
1) is bored (see Figure 3), and when the tip of the ball (6a) falls into the hook (11) due to the above rotation, the drive disk (3) moves in the direction of the arrow (
It does not have a shape that allows the latch ball (6) to engage with the clutch disc (4) by reversing it in the y direction. Also, due to the above, the latch ball (6) is
11) If the drive disk (3) continues to rotate in the direction of the arrow (X) even if the latch ball (6) falls inside, the latch ball (6) can be pulled out from inside the latch (11), and in this state, the spring (9) As a result, the latch ball (6) is brought to the band (1) side again. Therefore, when the drive disk (3) continues to rotate in the arrow (x) direction,
Even if the latch ball (6) once falls into the claw tree (11), the latch pole (6) passes through the side of the ball turning section (10) and then returns to the idling side zone (1) to drive the drive disc. (3) Idling is allowed.

The clutch disc (4) is further equipped with a one-way clutch (12) at its rotation center, and the clutch disc (4) is connected to the driven shaft (2) via this one-way clutch (12). It is mounted on a shaft. Therefore,
When the clutch disc (4) rotates in the direction of the arrow (x) via the drive disc (3), the one-way clutch (12) becomes idling relative to the driven shaft (2).
If the clutch disc (4) rotates synchronously with the drive disc (3) in the direction of the arrow (y) while the latch pole (6) is engaged with the latch (11), the rotation of the clutch disc (4) It is transmitted to the driven shaft (2) via the one-way clutch (12).

The clutch disc (4) is also provided with a built-in stopper (13) corresponding to the pin (7) of the drive disc (3), with the tip (13a) as a free end. If the disk (3) rotates in the direction of the arrow (x), the pin (7) will prevent it from passing (see Figure 4) and catch it, and in this state the drive disk (3) will rotate in the direction of the arrow (x). When the rotation continues, the pin (7)
- When the stopper (13) is engaged, the clutch disc (4) and the drive disc (3) rotate idly relative to the driven shaft (2), and are coupled and rotated in the same direction.

Therefore, the idle rotation of the disks in this state is as follows:
Since the positioning pin (7) is engaged with one of the stoppers (13), the space angle (θ
1) is maintained and the drive disk (3) is indicated by the arrow (x)
The home position is kept constant even if you rotate an appropriate number of times in the direction.

In the above, when the drive disk (3) rotates in the direction of the arrow (y), the bin (7) is rotated by the stopper (13).
) while bending inward, and also pass through the latch pole (6
) simply overcomes the ball turning section (lO).

Only the drive disk (3) rotates idly relative to the driven shaft (2). Note that the clutch disk (4) for the above-mentioned rotational direction maintains a non-rotating state due to the load that rotates the driven shaft (2) because the one-way clutch (12) is in the connected direction. disk(
4) is provided with a brake drum (14), and as shown in Fig. 5, a brake (15) is attached to this so that the clutch disc (4) is kept in a stable stopped state. . In addition, the brake (15) in the illustrated case is shown for the case where two sets of clutch mechanisms (1) are provided, but if the clutch mechanism (1) is - set, the brake for - set is Of course, it is sufficient to add this to the drum. This allows the clutch disc (4
) (or 4') is constantly prevented from rotating obscenely.

In addition, a drive disk (
3) and the clutch disc (4), although not shown in the drawings, are equipped with an E-ring attached to the shaft end so that a series of play can be maintained.

Therefore, this clutch mechanism (1) does not simply rotate the drive disk (3) in the illustrated X direction or the However, it maintains non-rotation. and,
The drive disk (3), which is normally rotated in the X direction in relation to the interlocking mechanism, is reversed by the interlocking mechanism by an operating rotation angle (02) (02=01+θ': where θ' is the operating space angle, (See Figure 4.) When rotated in the opposite direction, the latch pole (
The tip (6a) of 6) passes over the ball turning portion (1o) of the clutch disc (4). Next, when this state is reached, the rotation direction of the drive side is reversed again and the drive disk (3)
When the latch pole (6) is reversed by the operating space angle (θ') in the X direction shown in the figure, the latch pole (6) retreats due to the rotation, and the tip (6)
a) is in contact with the turning surface (10a) of the ball turning part (10) and is re-guided to swing toward the claw tree (11), and the latch pole (
6) falls into the Tsumegi (11). Therefore, on the drive side, if the drive disk (3) is reversely rotated again (in the X direction in the figure) in response to the swinging operation of the latch pole (6), the latch pole (6) in this state will be rotated in the direction of the latch ( 11), and the clutch disk (4) can be connected and rotated in the same direction (y direction) as the drive disk (3). Of course, this rotation can be performed continuously, and thereby the driven shaft (2) can be simultaneously rotated in the y direction in the drawing via the one-way clutch (12).

FIG. 6 shows an example in which when a plurality of clutch mechanisms (1) are used together, a timing difference is maintained between the operating points of each clutch mechanism in order to operate each clutch mechanism separately. show.

In this case, while the space angle between the latch pole (6) and the latch (11) is shown above (θ1), the positioning for setting the home position of the latch pole (6) with respect to the latch (11) The position of the pin (7) for
) is shown by moving back by an angle (α) on the rotation locus of (7
’) position, thereby setting this pin (
The space angle, which is the home position of the latch pole (6') when the latch pole (6') engages with the stopper (13), opens to the illustrated (03) position with respect to the so-called pawl (11).

Therefore, this means that the selection of operating the clutch mechanisms (1) and (1') depends on the operating rotation angles (02) and (θ4) of the latch poles (6) and (6') that engage with the pawls (11). ) can be selected accurately.

Next, an example of the use of the clutch mechanism (1) according to the present invention is as follows.
This will be explained using FIG.

One figure shows a case in which a paper feeding device for automatically feeding paper (cut paper) is linked to an office machine (for example, a printer) having a platen (20), and the clutch mechanism (1) is driven by a clutch mechanism (1). A rubber paper feed roller (21) is attached to the shaft (2).
) is the installation. The platen (20) has a drive gear (
The platen gear (23) is rotated by the intermediate gear (24) which is in mesh with the intermediate gear (22).
- It meshes with the drive gear (5) of the drive disk (3) via (25). Further, the paper feed roller (21) of the driven shaft (2) is provided opposite to a paper feed cassette (27) in which paper (coat 1 - paper) (26) is stored.

In addition, when two sets of paper feeding cassettes (27) are used, as shown by the dashed line in the figure, the rubber rollers (21
A clutch mechanism (1'') that can be driven and controlled by the paper feeder (27') is provided alongside the paper feeding power center (27').

On the other hand, the intermediate gear (24) is provided with a paper discharge roller (29) for taking out the paper (26) after printing from the platen (20).
) are engaged with the gears (3θ) for rotating them.

-, the intermediate gears (24) and (25) are the platen (20), the Ji paper roller (29), and the paper feed roller (2).
The number may be any number as long as the direction of rotation in 1) is in the direction of the arrow shown in the figure. Further, the arrows in the drawings indicate the state in which the platen (20) rotates in the forward direction, and only the gear (5) of the drive disk rotates in the reverse direction.

As described above, the rotation of the paper feed roller (21) causes the cassette (2
When drawing out a sheet of paper (26) from 7), first, the platen (20) is reversely rotated by, for example, "7 lines". Note that the rotation of the platen (20) is performed by a program, and 7 lines indicates the number of 7 horizontal lines printed on the platen (20).

In the above example, if the platen (20) rotates backwards by 7 lines, in this usage example, the clutch mechanism (1) and (1'
)'s drive gears (5) and (5') rotate the CC drive disk 3 in the normal clutch rotation direction (y direction) by the operating rotation angle (θ2), respectively. In addition, the reverse rotation of the drive gears (5) and (5') in this case is due to the rotation of the pin (7) when the platen (20) was rotating normally when the platen (20) was rotating in the forward direction. ) and the stopper (13), the so-called latch pole (6
) and the set home position of Tsumegi (11).

Therefore, when the drive disk (3) reversely rotates by the above-mentioned seven lines, the tip of the latch pole (6) advances to the position "02 = θl + θ'" as shown in FIG. ). However, since the other latch pole (6') has a wide space angle (θ3), it does not go beyond the ball turning part (10). Next, the platen (20) rotated backwards by 7 lines, and then rotated forward by 2 lines to move the tip (6a) of the latch pole (6) backward by the working space angle (θ'), and the clutch mechanism (1 ) only the latch pole (6) falls into the claw tree (11).

Thus, when the platen (20) is rotated in the reverse direction again in this state, the latch pole (6) can engage with the latch (11) and the drive disc (3) and clutch disc (
4) is clutched, and the driven shaft (2
) in one direction (y direction). Therefore, the paper from the paper feed cassette (27) is fed toward the platen (20). In addition, this paper feed is such that the leading edge of the paper (26) reaches the paper feed opening to the platen (20) and is slightly deflected, and in this state, the platen (20)
) is returned to normal rotation, the above paper can be transferred directly to the platen (2).
In addition, the clutch mechanism (1) allows the drive disk (3) to rotate in reverse and the latch ball (6)
The clutch engagement of is automatically released. Note that the paper feed roller (21) for drawing out the paper (26) by the platen (20) can simply rotate idly without being influenced by the clutch mechanism (1).

Therefore, by using this clutch mechanism (1), automatic paper feeding and selection of the paper to be fed can be performed easily and accurately.
In order to select the clutch mechanism (1') side, the platen (20) may be rotated reversely for nine lines and forwardly rotated for two lines according to a program.

The clutch mechanism of the present invention is configured as described above, and the clutch engagement between the drive disk and the clutch disk is as follows.
This can be done accurately by setting the timing of the swing position of the latch ball provided on one of the discs. Furthermore, the structure is extremely simple and robust, and the durability can be significantly improved for use in fields where precision is required. Furthermore, since the clutch can be reliably engaged and disengaged by swinging the latch ball, it is possible to easily downsize both disks, or the so-called clutch mechanism.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view showing the clutch mechanism of the present invention, Fig. 2 is an enlarged plan view of the same as above, Fig. 3 is a cross-sectional explanatory view of the clutch disc as seen from the right side, and Fig. 4 is a pin and stopper. Fig. 5 is an explanatory diagram of the correspondence between the latch ball and clutch disc showing the engaged state of the
The figure is an explanatory diagram of the correspondence between the latch ball and the clutch disc when the home position is slid, and FIG. 7 is an explanatory diagram of an example of use of the clutch mechanism. (1) Clutch mechanism (2) Driven shaft (3) Drive disk (4)
・・・・・・Clutch disc (5)・・・・・・・・・
・Drive gear (6)...Latch ball (6a)...Latch pole tip (7)・
......Pin (10)...Pole conversion section (11)...
......Tsumeki (12)...One-way clutch (13)
)... Stopper patent applicant Ricoh Co., Ltd. Agent Patent attorney Shunsuke Nakao Figure 1 Figure 3 Figure 4 Figure 5 Figure 7

Claims (1)

[Claims] In a one-way clutch, a drive disk and a clutch disk are installed together on the driven shaft, one drive disk is provided with a drive gear, a latch ball, and a positioning pin, and the other clutch disk is provided with the above-mentioned A stopper that can engage the pin when the drive disk rotates in reverse (idle rotation), a one-way clutch that is mounted between the driven shaft, and a ball turning portion and a pawl that can be accommodated by the latch pole, The latch pole presses the clutch disc toward the pawl of the clutch disc, and is configured to be able to swing in a direction away from the pawl of the clutch disc. The latch pole is energized, and the latch pole can be swung to a position where it can engage with the pawl hole via the ball turning portion when its tip passes the side of the pawl tree in a reverse rotation direction. A clutch mechanism characterized in that it is configured as follows.