JPS61149378A - Clutch for automatic paper-supplying device in printer - Google Patents

Abstract

PURPOSE:To prevent a paper form being needlessly supplied, by a construction wherein the distance from a turning point of a pawl-turning part to a pawl hole is set to be larger than a pawl displacement corresponding to an allowable reverse rotation quantity at the time of printing which is determined in the reverse rotating direction, and a guide means for guiding a latch pawl from the turning point to the pawl hole is provided. CONSTITUTION:In the process of printing on a paper brought to a printing position, when back line feeding by a predetermined allowable amount is performed under the condition where a home position of a clutch is not maintained, for example, where the tip 6a of the latch pawl is located on the immediate downstream of a turning part 10 in the forward rotating direction, the tip 6a of the pawl is turned into a zone II by a turning surface 10a, but since the distance from the turning point to the pawl hole 11 (the circumferential length corresponding to a rotating angle theta) is larger than the length corresponding to the predetermined back line feed quantity, a clutch is not engaged by engagement of the tip 6a of the pawl into the pawl hole 11.

Description

TECHNICAL FIELD This invention relates to a one-way clutch for driving a paper feed roller of an automatic paper feed device of a printer by a platen drive shaft.

Prior Art As a device that automatically feeds stacked sheets of paper stacked in a cassette to a platen of a printer one by one, the present inventors first developed a device that automatically feeds a stack of paper sheets stacked in a cassette to a platen of a printer. The paper roller is driven in the paper feeding direction from the platen drive shaft via a clutch mechanism, and after the front edge of the paper is slightly drawn into the platen, the platen is rotated in the opposite direction by a predetermined amount.
A paper feeding device has been proposed in which the leading end of the paper that has been drawn into the platen is retreated and discharged from the platen, and the clutch is disengaged by reversing the platen.

By configuring the paper feed device in this way, it is possible to avoid overfeeding or underfeeding the leading edge of the paper that is pulled out due to friction with the paper feeding roller relative to the platen, avoid damage to the leading edge of the paper, and correct skew feeding, etc. benefits.

Clutches used for the above purpose include:
For example, by rotating the printer's platen by a predetermined amount in the paper feed direction (forward rotation direction) and then rotating it by a predetermined amount in the reverse direction, the drive-side rotating part rotates in the normal direction as the platen rotates in the normal direction. After advancing the provided engagement claw a certain amount from the home position along the circumferential path provided on the driven shaft side, the provided engaging claw is moved along a guide (turning portion) provided diagonally with respect to this path. The clutch is engaged by engaging an engagement hole provided in that path that engages only in the forward direction of rotation, and in this state, when the platen rotates in the normal direction, the driven shaft is Adopt a mechanism configured such that when the platen rotates integrally with the drive-side rotating member and the platen is reversed by more than a certain value, it escapes from the engagement hole and returns to its original path, releasing the coupling of the clutch. I can do it.

By the way, it is necessary to perform backline feed during printing by the printer. If the amount of reversal of the platen in the reservoir matches or slightly exceeds the predetermined amount of reversal in the clutch engagement reservoir described above, the clutch will engage and the paper will be fed unwillingly, so the printer will ,
The allowable backline feed amount is determined in advance. Therefore, if the clutch always maintains the home position during printing, the clutch will never engage for the above-mentioned predetermined allowable backline feed.

In the above-mentioned normal rotation paper feed system in which the paper feed roller is driven by the normal rotation of the platen, the home position of the clutch is determined by pressing the platen immediately before performing bin select (if there are two bins in the paper feed device). The home position is not necessarily maintained during normal printer print line feeding. Therefore, if backline feed is performed during printing, depending on the position of the engaging claw,
The clutch may be engaged even when the backline feed is at or below a predetermined allowable backline feed amount.

Purpose This invention has been made in view of the above, and provides a clutch for use in a printer automatic paper feeding device of a normal rotation paper feeding system, in which a permissible backline feed is performed when the clutch is not in the home position. An object of the present invention is to provide a clutch that is never connected.

Structure In order to achieve this object, the one-way clutch according to the present invention has a drive disk and a clutch disk loosely mounted on the driven shaft, and one drive disk has a drive gear, a latch pole, and a positioning pin. The other clutch disc is provided with a stopper that can engage with the pin when the drive disc begins to rotate in reverse (idling), a one-way clutch that is mounted between the driven shaft and the latch pole. A corresponding pawl turning portion and a pawl hole are provided, and the latch pawl presses the clutch disc toward the pawl hole of the clutch disc, and normally presses the latch pawl against the pawl hole of the clutch disc. The latch pole is biased so as to be able to swing in a direction away from the pawl hole path, and when the tip of the latch pole passes through the pole turning portion in the opposite rotation direction, the latch pawl passes through the pole turning portion It is configured to be able to swing to a position where it enters the hole path, and the distance from the turning point of the pole turning section to the nail hole is a goal movement amount corresponding to the allowable reverse rotation amount of the platen during printing, which is predetermined in the reverse rotation direction. The latch pole is set larger than the above, and is characterized by being provided with a guide means for guiding the latch pole from the turning point to the pawl hole.

The present invention will be explained below based on an embodiment shown in the drawings.

1 to 5, a clutch mechanism 1 consists of a drive disk 3 and a clutch disk 4, which are loosely mounted on a driven shaft 2, and a drive gear 5 on the drive disk 6.
・Latch pole 6th place! A deciding bottle 7 is provided.

The latch pole 6 is protruded from the side of the drive disk 6 by a spindle 8 so that the tip 6a is along the sliding surface 4a of the clutch disk 4, and is held rotatably about the spindle 8 as a fulcrum. . A spring 9 is wound around the support shaft 8, and the tip 6a of the latch pole 6 is biased toward the center of rotation of the drive disk 3 by the elasticity of the spring 9.

On the other hand, in addition to the above-mentioned elasticity applied to the latch pawl 6 by the spring 9, as is clear from FIG. It is tilted in an oscillating manner via a spring 9 so as to follow an idling permissible zone (I) which is a section of the contact position.

For this zone (1), the tip 6a of the latch pole 6
A protruding pole turning part 1 that can be climbed over without engaging the pole.
0, and this pole turning section 10 has an inclined turning section that allows the tip 6a of the latch pole 6 to swing toward the rotation transmission band (U) side when the drive disk 6 rotates in the direction of the arrow (X). Surface 10a is provided.

In the above, on the band (n) side, the tip 6a of the latch pole 6 is located on the side of the pole turning section 10, and the tip 6a of the latch pole 6 is located on the turning surface 10.
After turning to the band (■) along a, the goal turning part 10
There is a claw hole 11 that can be moved in the X direction on the side and fall into it (see Figure 6). Band (II) of turning surface 10a
The rotation angle θ corresponding to the distance from the side end, that is, the turning point to the pawl hole 11, is set larger than the rotation angle corresponding to a predetermined backline feed amount allowed during printing. A guide 11' is formed by the side surface of the turning portion 10 between the turning point and the pawl hole 11. This claw hole is located at the tip of the pole 6a.
When the drive disk 3 falls into the pawl hole 11 due to the above rotation, the latch pole 6 and the clutch disk 4 are not in a shape that can be engaged with each other by inverting the drive disk 3 in the direction of the arrow CI). Further, as described above, even if the latch pole 6 falls into the claw hole 11, if the drive disk 6 continues to rotate in the arrow (X) direction, the latch pole 6 can be pulled out from the claw hole 11, and in this state, The latch pole 6 is brought to the band (1) side again by the spring 9. Therefore, when the drive disk 6 continues to rotate in the direction of the arrow (x), even if the latch pawl 6 partially falls into the pawl hole 1'+, the latch pawl 6 passes through the side of the pawl turning part 13. , returns to the idling side band (1) again and allows the drive disk 6 to idle.

A one-way clutch 12 is further attached to the rotation center of the clutch disc 4, and the clutch disc 4 is rotatably attached to the driven shaft 2 via the one-way clutch 12. Therefore, when the clutch disc 4 rotates in the direction of the arrow (X) via the drive disc 6, the one-way clutch 12 becomes idling relative to the driven shaft 2, and the latch pawl 6 engages with the pawl hole 1'1. When the clutch disc 4 rotates synchronously with the drive disc 6 in the arrow (y) direction in this state, the rotation of the clutch disc 4 is transmitted to the driven shaft 2 via the one-way clutch 12.

The clutch disk 4 is also provided with a built-in stopper 13 corresponding to the pin 7 of the drive disk 3, with the tip 15a as a free end. prevents the pin 7 from passing (see Fig. 4) and stops the pin 7 from passing, and when the drive disk 3 continues to rotate in the direction of the arrow (x) in this state, the clutch disk 4 is engaged by the engagement of the pin 7 and the stopper 13.
is driven together with drive disk 6! 11t Rotates idly relative to 2, and connects and rotates 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 (θ1) between the latch pole 6 and the claw hole 11, which is the so-called home position, is maintained.
Even if the drive disk 6 rotates an appropriate number of times in the arrow (X) direction, the home position is kept constant.

In the above, when the drive disk 6 rotates in the direction of the arrow (y), the pin 7 passes through the stopper 13 while being bent inward, and the latch pawl 6 simply climbs over the pole turning portion 10 and rotates in the direction of the arrow (y). 3 rotates idly with respect to the driven shaft 2. In addition, since the one-way clutch 12 is connected in the direction of rotation, the clutch disc 4 is kept in a non-rotating state due to the load that rotates the driven shaft 2, but the clutch disc 4 has a brake drum. 14, and as shown in FIG. 5, a brake 15 is added to this to ensure that the clutch disc 4 is kept in a stable state.

In addition, the brakes 15 in the illustrated case are shown for the case where two sets of clutch mechanisms are provided, but if the clutch mechanism 1 is one set, a brake for the - set is added to the drum. Of course, it is fine. This prevents the clutch disk 4 (or 4') from rotating unnecessarily at all times.

Further, a drive disk 6 freely mounted on the driven shaft 2,
Although the clutch disc 4 is omitted in the illustration, the E
The IJ song is attached to the end of the shaft so that a series of play equipment can be maintained.

Therefore, in this clutch mechanism 1, when the drive disk 3 simply rotates in the X direction or the Y direction in the drawing, the clutch disk 4, which is responsible for driving and rotating the driven shaft 2 in only one direction, remains non-rotating.

The drive disk 3, which is normally rotated in the X direction in relation to the interlocking mechanism, is rotated by the operating rotation angle (θ2) (θ2 = θ1 + θl: where θ' is the operating space angle, and the fourth (See figure.) When the latch pole 6 is rotated in the opposite direction, the tip 6a of the latch pole 6 moves to the pole turning portion 10 of the clutch disc 4.
exceed. Next, when this state is reached, the direction of rotation on the drive side is reversed again and the drive disk 6 is reversed by the working space angle (θ') in the X direction shown in the figure. The latch pole 6 contacts the turning surface 101L of the turning section 10 and is oscillatedly guided toward the band (2) side, and the latch pole 6 moves toward the guide surface 11' by a distance corresponding to the angle θ.
, and falls into the claw hole 11. Therefore, on the drive side, if the drive disk 6 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 can engage with the claw hole 11.
The clutch disc 4 is in the same direction as the drive disc 6 (y
direction) and can be rotated. Of course, this rotation can be performed continuously, so that the driven shaft 2 can simultaneously rotate in the X direction in the drawing via the one-way clutch 12.

FIG. 6 shows an embodiment 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.

In this case, while the space angle between the latch pole 6 and the pawl hole 11 is shown above (θ1), the position of the positioning pin 7 for setting the home position of the latch pole B with respect to the pawl hole 11 is The pin is moved back by an angle @ ) on the rotation locus of 7 and set at the 7' position shown in the figure, thereby setting the space that is the home position of the latch pole 6' when this pin 7' engages with the stopper 13. The corner opens at the position shown (θ6) with respect to the so-called claw hole 11.

Therefore, this means that the selection for operating the clutch mechanism 1, 1' is based on the latch pole 6, 6' that engages with the pawl hole 1'.
This can be done accurately by selecting the operating rotation angles (θ2) and (θ4).

Next, a seventh example of the use of the clutch mechanism 1 according to the present invention will be described.
This will be explained using figures.

The figure shows a case in which a paper feeder for automatically feeding paper (cut paper) is linked to an office machine (for example, a printer) having a platen 20, and the driven shaft 2 of the clutch mechanism 1 has a rubber The paper feed roller 21 made by the manufacturer is attached. The platen 20 is rotated by a platen gear 26 that meshes with the drive gear 22, and the platen gear 25 is rotated by a
It meshes with the drive gear 5 of the drive disk 6 via intermediate gears 24 and 25. Further, the paper feed roller 21 of the driven shaft 2 is provided opposite to a paper feed cassette 27 in which paper (cut paper) 26 is stored.

In addition, when two sets of paper feeding cassettes 27 are used, as shown by the dashed line in the drawing, a clutch mechanism 1' having the same configuration as the clutch mechanism 1 and capable of controlling the drive of the rubber roller 21' is connected to the clutch mechanism 1 via the intermediate gear 28. The paper feed cassette 27' is disposed opposite to the paper feed cassette 27'.

On the other hand, the intermediate gear 24 meshes with a gear 30 for rotating a paper discharge roller 29 that takes out the printed paper 26 from the platen 20.

In the above, the intermediate gears 24, 25-1, 25-2 are
The number of platen 20, paper discharge roller 29, and paper feed roller 21 may be any number as long as the rotation directions are in the direction of the arrow shown in the figure. Moreover, the arrow in the illustration indicates the state of the platen 2o in the forward rotation direction, and indicates the case where only the gear 5 of the drive disk is rotating in the forward direction.

As described above, when drawing out one sheet of paper 26 from the cassette 27 by rotation of the paper feed roller 21, the platen 20 is first rotated in the forward direction by, for example, 12 lines. In addition, platen 2
Rotation of 0 is performed by a program. The 12 lines indicate the number of 12 rows of horizontal printing on the platen 20.

In the above, when the platen 20 rotates forward by 12 lines, in this usage example, each drive disk 6 is rotated forward by the operating rotation angle (θ2) via the drive gears 5 and 5' of the clutch mechanisms 1 and 1'. rotate in the rotation direction (y direction). In addition, drive gear 5.5 in this case
The forward rotation of ' is caused by the pin 7 being rotated idly when the platen 20 was previously rotating in the reverse direction with respect to the clutch disc 4.
The engagement position between the stopper 13 and the so-called latch pole 6
and the set home position of the claw hole 11.

Therefore, when the drive disk 6 rotates in the forward direction by the above seven lines, the tip of the latch pole O becomes "
Proceed to the position of θ2=01+θ' and turn the pole turning section 10.
exceed. However, since the other latch pole 6' has a wide space angle (θ3), it does not go beyond the pole turning portion 10 and remains there. Next, when the platen 20 rotates forward by 12 lines and then rotates backward by 7 lines to move the tip 6a of the latch pole 6 backward by the working space angle (θ'), only the latch pole 6 on the clutch mechanism 1 side is rotated. It falls into the claw hole 11.

Thus, when the platen 20 is rotated forward again in this state, the latch pole 6 can engage with the claw hole 11, the drive disk 3 and the clutch disk 4 are clutched, and the clutch mechanism 1 rotates forward (rotation in the y direction). The driven shaft 2 of the paper feed roller 21 is rotated forward in one direction (y direction). In this case, the paper on the paper feed cassette 27 side is on the platen 2.
Paper is fed toward 0. Further, this paper feeding is performed until the leading edge of the paper 26 reaches the paper feeding port for the platen 20 and is slightly pulled into the platen 20. In this state, if the platen 20 is returned to reverse rotation, the above-mentioned The leading edge of the paper is returned to the paper feed port of the platen 20 and is deflected, and the drive disk 3 of the clutch mechanism 1 rotates in the reverse direction, and the clutch engagement of the latch pole B is automatically released. Note that the paper feed roller 21 for drawing out the paper 26 by the platen 20 is controlled by the clutch mechanism 1.
You can simply spin around. In this way, the platen can be rotated in the normal direction and the paper can be wound around the platen to the printing position.

Therefore, if this clutch mechanism 1 is used, 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 must be moved by a program, for example, in the correct direction. Rotation 14 lines・
Just do 7 lines of reverse rotation.

Now, in the process of printing on the paper brought to the printing position, if the home position of the clutch is not maintained, for example, when the latch pole tip 6a is just behind the deflection section 10 in the normal rotation direction, the printing If the backline feed is performed within the specified allowable amount, the tip of the pole 6
a is turned to band (2) by a turning surface of 10 m, but the distance from the turning point to the claw hole 11 (the length corresponding to the rotation angle θ) is longer than the length corresponding to the above-mentioned predetermined backline feed amount, so the pole tip 6a The clutch is not engaged with the pawl hole 11 to engage the clutch.

Effects As described above, the clutch mechanism of the present invention not only satisfies the conditions as a clutch for a normal rotation paper feeding device of a printer, but also prevents errors due to the allowable amount of backline feed during printing. It is possible to prevent unnecessary paper feeding due to the clutch being engaged as intended.

[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 pawl hole as seen from the right side of the clutch disc, and Fig. 4 is a pin and stopper. Fig. 5 is an explanatory diagram of the correspondence between the latch pole and clutch disc showing the engaged state of the
The figure is an explanatory diagram of the correspondence between the latch pole and the clutch disc when the home position is shifted, and FIG. 7 is an explanatory diagram of an example of use of the clutch mechanism. 1... Clutch mechanism 2... Driven shaft 3... Drive disc 4... Clutch disc 5... Drive gear 6... Latch pole 6a... Latch pole tip 7... Pin 10 ... Pole turning section 11 ... Claw hole 11' ... Guide means 12 ... One-way clutch 13 ... Stopper substitute" August - 17th, 2016 Manabu Shiga, Commissioner of the Japan Patent Office 1 Display of the case 1982 Patent Application No. 272050 2 Name of the invention Clutch for printer automatic paper feeder 3 Relationship with the amended person case Patent application Name (Name') (674) Ricoh Co., Ltd. 4 Agent address 5 Kaji Kogyo Building, 2-32-4 Nishi-Shimbashi, Minato-ku, Tokyo Date of amendment order (voluntary) v-T-- 1-1 6. Detailed description of the invention in the specification to be amended and drawing 7, contents of the amendment (℃ Changed "close reading" to "continuation" on line 11 of page 9 of specification 1/E)
I am corrected. (Replace Figures 4 and 6 with the attached ones.

Claims (1)

[Claims] Rotate the printer platen a specified amount in the paper retraction direction,
Then, by rotating a predetermined amount in the opposite direction, the clutch is engaged, and as the platen rotates in the paper retraction direction, the paper feed roller of the automatic paper feeder is driven from the platen drive shaft in the paper feed direction via the clutch. In the clutch of an automatic printer paper feeder, the clutch is disengaged by reversing the platen after the leading edge of the paper is slightly drawn into the platen, and a drive disk and a clutch disk are attached to the driven shaft and are idle. One drive disk is provided with a drive gear, a latch pole, and a positioning pin, and the other clutch disk is provided with a stopper that can engage with the pin when the drive disk rotates in reverse (idle rotation), and a stopper that can engage with the pin when the drive disk rotates in reverse (idling). A one-way clutch is mounted between the drive shaft and the latch pole is provided with a pole turning portion and a pawl hole that can accommodate the latch pawl, and the latch pawl is directed toward the pawl hole of the clutch disc with respect to the clutch disc. At the same time, the latch pawl is biased so that it can swing in a direction away from the path of the pawl hole in the clutch disc, and the tip of the latch pawl is attached to the pawl turning section. When passing through the pole in the reverse rotation direction, the pole can be swung to a position where it enters the pawl hole path via the pole turning section, and the distance from the turning point of the pole turning section to the pawl hole is set in advance in the reverse rotation direction. The clutch is set to be larger than a pole movement amount corresponding to a permissible reverse rotation amount of the platen during predetermined printing, and is further provided with a guide means for guiding the latch pole from the turning point to the pawl hole.