JP2639839B2 - Cut sheet feeder and printer using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Summary] The present invention relates to a cut sheet feeder having first, second, and third bin cut sheet feeders and a printer using the same, and relates to first, second, and third bin cut sheet feeders. A first bin provided with a first pickup roller for selectively applying a rotational driving force from one driving source to selectively feed out a sheet and facilitating attachment and detachment of a cut sheet feeder A second sheet having a cut sheet feeder and a second pickup roller;
A bin / cut sheet feeder, a third bin / cut sheet feeder including a third pickup roller, a first transmission member for transmitting a rotational driving force from a drive source to the first pickup roller, and a second and third member A second transmission member for transmitting the rotational driving force to the pickup roller;
And a connection switching means for selectively switching and transmitting to either one of the transmission member and the second transmission member. The first to third pickup rollers are provided with rotation of these pickup rollers in the paper feeding direction. The one-way clutch provided for each of the second and third pickup rollers is provided so that when one of the second and third pickup rollers rotates in the sheet feeding direction, the other one-way clutch is provided. A cut sheet feeder whose rotation transmission direction is selected so as not to rotate is configured.

Also includes a first bin cut sheet feeder with a first pickup roller, a second bin cut sheet feeder with a second pickup roller, and a third bin cut sheet feeder with a third pickup roller. In the printer using the cut sheet feeder having the above configuration, a driving source, a first transmission member for transmitting a rotational driving force from the driving source to the first pickup roller, and a rotational driving from the driving source to the second and third pickup rollers. A second transmission member for transmitting the force, and connection switching means for selectively switching and transmitting the rotational driving force to one of the first transmission member and the second transmission member. Each of the three pickup rollers is provided with a one-way clutch that enables only the rotation of the pickup rollers in the paper feeding direction. The one-way clutch provided on the second and third pickup rollers has a configuration in which the rotation transmission direction is selected so that when one of the second and third pickup rollers rotates in the sheet feeding direction, the other does not rotate. A printer using the cut sheet feeder having the printer.

[Industrial applications]

The present invention relates to a cut sheet feeder and a printer using the same.

[Conventional technology]

FIG. 5 is a side view schematically showing the structure of a drive mechanism of a conventional cut sheet feeder of this type. In the drawing, reference numeral 1 denotes a platen provided on the printer main body, and 2 denotes a three-bin type provided on the cut sheet feeder side. Is a drive mechanism of the cut sheet feeder. Cut sheet feeder for the first bin (hereinafter C.
The first pickup roller (hereinafter referred to as P.F.
UR abbreviated) 3 _1, the driving system for transmitting the driving force from the platen 1 to the first PUR 3 ₁ (gear system) and 4, and the gear 6 to gear 5 meshes of PUR 3 ₁ coaxially are provided, C. in the second bin
The SF, a second PUR 3 _2, and a gear 7 for transmitting a driving force from the gear 6 to PUR 3 ₂ coaxial gears 10 are mounted on the CSF of the third bin, a third PUR 3 ₃ When the gear 8 and 9 for transmitting the driving force from PUR 3 ₂ coaxial gear 10 to PUR 3 ₃ coaxial gear 11 is provided. Each PUR _{3 1} ~3 3, on the driving force transmission to the PUR 3 ₁ ~3 _2, the electromagnetic clutch for turning off is provided. The operation of the driving mechanism 2 is as follows.

When using the CSF of the first bottle, check the PUR 3 ₁ of the electromagnetic clutch, to turn off the PUR 3 _2, 3 ₃ of the electromagnetic clutch. When driven by a driving source not shown platen 1 is rotated forward in the arrow direction in this state, PUR 3 ₁ is forward in the direction of the arrow is driven via a drive system 4, thereby the first bin in CSF Cut paper is fed out. In this case, PUR _{3 2,} 3 3 is not rotated, CSF of the second and third bottle does not operate.

When using the CSF of the second bottle, check the PUR 3 ₂ electromagnetic clutch, to turn off the PUR 3 _1, 3 ₃ of the electromagnetic clutch. When platen 1 is reversed in this state, PU
Only R 3 ₂ is rotated forward, cut paper in CSF of the second bin is extended.

When using the CSF of the third bin, to turn on only the electromagnetic clutch of PUR 3 _3. When the normal rotation of the platen 1 in this state, only the PUR 3 ₃ rotates clockwise, the third bin CSF
The cut paper inside is fed out.

In any of the above cases, when the leading edge of the fed cut sheet reaches the platen 1, a signal from a sensor (not shown) for detecting the cut sheet is received, the PUR is turned off (the electromagnetic clutch is turned off), and the cut sheet is thereafter rotated forward. The platen 1 is conveyed and set to a printing start state. Printing on the set cut sheet is performed while the cut sheet is line-feeded by the platen 1, and the cut sheet on which printing has been completed is
A platen 1 and a first bin that rotates synchronously with the platen 1
With the ejection roller 12 on the CSF side, the first bin
It is discharged to the discharge part of CSF.

[Problems to be solved by the invention]

When driving a CSF PUR with a normal motor, it is possible to drive up to one or two bins (for example, one bin with forward rotation of the motor,
Although two bins are driven by the reverse rotation of the motor), in the case of FIG. 5 described above, by providing an electromagnetic clutch for each PUR, up to three bins can be driven by one drive source.

However, in this case, when attaching / detaching the CSF to / from each bin, in addition to mechanical attachment / detachment, electrical disengagement (disengagement of the cable connected to the electromagnetic clutch of each bin) is also required, making the operation extremely troublesome. Met.

The present invention selectively applies a rotational driving force from a single drive source to the first, second, and third bin / cut sheet feeders to enable the paper to be selectively fed out, and to facilitate the attachment / detachment of the cut sheet feeder. It is intended to be.

[Means for solving the problem]

A cut sheet feeder according to the present invention includes a first bin cut sheet feeder having a first pickup roller, a second bin cut sheet feeder having a second pickup roller, and a third bin having a third pickup roller. A cut sheet feeder, a first transmission member for transmitting a rotational driving force from a driving source to the first pickup roller,
A second transmission member for transmitting the rotational driving force to the second and third pickup rollers, and a connection for selectively switching and transmitting the rotational driving force to one of the first transmission member and the second transmission member; Switching means, wherein the first to third pickup rollers are provided with one-way clutches respectively enabling only rotation of these pickup rollers in the paper feeding direction, and provided on the second and third pickup rollers. The one-way clutch has a configuration in which the rotation transmission direction is selected so that when one of the second and third pickup rollers rotates in the paper feeding direction, the other does not rotate.

The printer of the present invention also includes a first bin cut sheet feeder having a first pickup roller, a second bin cut sheet feeder having a second pickup roller, and a third bin cut sheet feeder having a third pickup roller. A printer using a cut sheet feeder having a configuration including a cut sheet feeder, a drive source, a first transmission member for transmitting a rotational driving force from the drive source to a first pickup roller, and second and third pickups A second transmission member for transmitting the rotational driving force from the driving source to the roller, and a connection switching unit for selectively switching and transmitting the rotational driving force to one of the first transmission member and the second transmission member And the first
The third to third pickup rollers are respectively provided with one-way clutches that enable only the rotation of the pickup rollers in the paper feeding direction.
The one-way clutch provided on the pickup roller has a cut sheet feeder having a configuration in which the rotation transmission direction is selected so that when one of the second and third pickup rollers rotates in the paper feeding direction, the other does not rotate. The configuration is used.

(Operation)

When using the cut sheet feeder of the first bin,
The first drive member is connected to the drive source by the connection switching means. At this time, the second drive member is disconnected from the drive source. In this state, when the drive source is rotated in a predetermined direction, for example, is rotated forward, the pickup roller of the first bin is rotated forward by the action of the one-way clutch, and the paper is fed by the pickup roller. In this case, the second and third bins do not operate.

When using the cut sheet feeders of the second and third bins, the second drive member is connected to the drive source by the connection switching means. At this time, the first driving member is separated from the driving source. In this state, when the drive source is rotated in a predetermined direction, for example, in the reverse direction, the pickup roller of the second bin rotates forward by the action of the one-way clutch, and the pickup roller of the third bin does not rotate because the one-way clutch slides in the reverse direction. . That is, only the cut sheet feeder of the second bin operates. When the drive source is rotated forward, the second
The pickup roller of the bin does not rotate, and only the pickup roller of the third bin rotates forward. That is, only the cut sheet feeder of the third bin operates.

In any case, the fed-out sheet is set to a printing start state by the normal rotation of the platen.

As described above, by switching the connection of the driving sources by the connection switching unit and appropriately selecting the rotation direction of the driving source, it is possible to selectively use the three-bin cut sheet feeder.

As a driving source, a platen may be used, or a driving source may be separately provided in the cut sheet feeder of the first bin. In the former case, continuous printing is not performed (so that the next sheet is not fed during printing of one sheet), and the sheet fed by the pickup roller of the second bin is then placed on the platen. In order to prevent the cut sheet feeder of the third bin from operating when setting by forward rotation, an electromagnetic clutch is provided in the drive system before the first drive member to detect that the leading edge of the sheet has reached the platen. It is better to turn off the electromagnetic clutch according to the signal of the sensor that performs the operation. On the other hand, in the latter case, although another drive source is required, there is an advantage that the electromagnetic clutch as described above is not required and the load on the platen can be reduced.

By using the drive mechanism of the cut sheet feeder of the present invention, electrical connection by a cable or the like is only required for the first bin even when an electromagnet or the like is used for the connection switching means, and is unnecessary for the second and third bins. Therefore, attachment and detachment of the cut sheet feeder becomes easy.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

FIG. 1 is a side view showing an outline of the structure of a drive mechanism of the cut sheet feeder of the present embodiment, FIG. 2 is a plan view showing details of a main part of FIG. 1, and FIG. FIG. In the drawings, 1 is a platen (drive source), 21 is a driving mechanism of the cut sheet feeder, 100 _1, 100 _2, 100 ₃ a
1, 2nd, 3rd bin cut sheet feeder (In the drawing, this is shown as "1st bin cut sheet feeder", "2nd bin cut sheet feeder", "3rd bin cut sheet feeder". 1, second and third CSFs). 22 ₁ , 22 ₂ , 22 ₃ are first, second, third pickup rollers (hereinafter abbreviated as PUR), 23, 24 are first and second transmission members, 25 is connection switching means, 26 ₁ , 26 ₂ and 26 ₃ are one-way clutches.

The drive mechanism 21 is provided with a gear (first
Transmission member) 23 and the PU 23
R 22 _2, gears for transmitting the driving force to the 22 ₃ (second transmission member) 2
4 and a connection switching means 25 for selectively transmitting the rotation of the platen 1 as a drive source to the gears 23 and 24. Each P.
The URs 22 ₁ , 22 ₂ , 22 ₃ have a one-way clutch 26 ₁ that allows only rotation of the PURs 22 ₁ , 22 ₂ , 22 _{3 in} the paper feeding direction (clockwise normal rotation direction in FIG. 1). , 26 _2, 26 ₃ are respectively provided. As shown in detail in FIG. 2, the connection switching means 25 includes a gear 28, which is automatically and slidably supported by the rotating shaft 27 and is locked in the circumferential direction, and the gear 28 in the direction of the arrow in FIG. It comprises a spring 29 for biasing, and a cam plate 31 connected to the magnet cylinder 30 and engaged with the end face of the gear 28. Gears 33-36 which mesh with each other between the platen 1 and the coaxial gear 32 and the gear 28 is provided, the gear 38, 39 between the PUR 22 ₂ coaxial gear 37 and the gear 24 is provided,
Gear 41, 42 between the PUR 22 ₃ coaxial gear 40 and the gear 37 is provided. Each one-way clutch 26 ₁ , 26 ₂ ,
26 ₃ is, specifically, between PUR 22 ₁ and gear 23, PUR 22
Between ₂ and the gear 37 are respectively provided between the PUR 22 ₃ and the gear 40. As shown in FIG. 1, the components up to the gear 38 are stored in the first bin, the components up to the gear 37 are stored in the second bin, and the components up to the gear 40 are stored in the third bin.
The gear 34 is fixed coaxially with the ejection roller 12.

The drive mechanism of the cut sheet feeder of the present invention is configured as described above. Next, the operation thereof will be described.

When using CSF100 ₁ of the first bin, to turn off the magnet cylinder 30 of the connection switching means 25. As a result, the cam plate 31 retreats in the direction of arrow A in FIGS. 1 and 2, and the gear 28 biased by the spring 29 is positioned at the position indicated by the chain line in FIG. The gear 36 has a sufficient length so that the gear 28 meshes with the gear 28 regardless of the position of the chain line or the solid line. In this state, the gear 28 is disengaged from the gear 24, and the second and third bins are disconnected from the drive source. When the platen 1 is rotated forward in this state, the gear 23 is driven via the gears 32, 33, 34, 35, 36, and 28 to rotate forward. Therefore, PUR 22 ₁ by the action of the one-way clutch 26 ₁ rotates forward, housed sheets CSF 100 ₁ of the first bin is fed. Subsequent sheet setting, printing, and sheet discharging are performed in the same manner as in the related art, and thus description thereof is omitted.

When using the CSF 100 ₂ and 100 ₃ of the _second and third bins, the magnet cylinder 30 is turned on. Thereby, the cam plate 31
Is driven to advance in the direction of arrow A ', and the inclined surface of the cam plate 31 is
The engagement of the gear 31a with the conical surface 28a on the side of the gear 28 causes the gear 28 to move to the position shown by the solid line in FIG. That is, the gear 24 is connected to the drive source. At this time, the gear 23 is disconnected from the drive source, CSF 100 ₁ of the first bin will not operate. If the platen 1 is reversed in this state, the gear 37 will rotate
Is driven through the gears 38 and 39 rotating forward by 24, the paper of CSF 100 within ₂ is drawn out PUR 22 ₂ of the second bin is forward by the action of the one-way clutch 26 _2. In this case, the gear 40 for reverse, in the same direction of sliding one-way clutch 26 _3, PUR 22 ₃ does not rotate. That is, CSF
100 ₃ does not work. When the platen 1 is rotated in the normal direction, the gear 37 rotates in the reverse direction and the gear 40 rotates in the normal direction.
100 ₃ paper feeding by PUR 22 ₃ operated is performed.

As described above, by switching the connection of the driving sources by the connection switching unit 25 and appropriately selecting the rotation direction of the driving source (platen 1), the CSF of each bin is changed as shown in the following table.
Can be selectively used as shown by a circle.

Make sure that continuous printing is not performed and that PUR 22
_In order to prevent the CSF 100 ₃ from operating when the sheet fed by ₂ is subsequently set by the normal rotation of the platen 1, an electromagnetic clutch is provided on a gear between the gears 23 and 34, for example, the gear 35, The electromagnetic clutch may be turned off by a signal from a sensor that detects that the leading end of the sheet has reached the platen 1. This electromagnetic clutch is turned on at the time of the next sheet setting.

FIG. 4 is a time chart showing the drive control procedure of each bin CSF. FIG. 4 (a) shows the first bin, FIG. 4 (b) shows the second bin, and FIG. 4 (c) shows the third bin. Each bin is shown. The timing of the operation of each of the above-described members is apparent from this drawing.

Further, in the present embodiment described an example in which the platen 1 and the drive source may be provided another driving source into CSF 100 _1. Specifically, providing the step motor with a gear which meshes with eg a gear 36 in CSF 100 ₁ to the output shaft. In this case, the gear 35 is omitted. Also, no electromagnetic clutch is required. By providing such a drive source, each of the PURs 22 ₁ , 22 ₂ , 22 is independent of the rotation of the platen 1.
₃ can be selectively driven, and the ejection roller 12 rotates in synchronization with the platen 1, so that the sheet can be discharged without any trouble.

By using the drive mechanism of the cut sheet feeder of this embodiment, only the first bin needs to be electrically connected by a cable or the like (connection to the magnet cylinder 30 and connection to the electromagnetic clutch when the electromagnetic clutch is used). 2,3
No need for bins. Therefore, CSF 100 ₂ in the _second and third bins,
The attachment / detachment of 100 ₃ is only required by mechanical operation, and the attachment / detachment work becomes easy. The cable 43 shown in FIG.
0 Connection cable to ₁ . In addition, each PU
This is advantageous in cost compared to the case where an electromagnetic clutch is required for R.

〔The invention's effect〕

As described above, according to the present invention, the CSF of each bin is selected by appropriately selecting the combination of the drive system connection switching by the connection switching unit and the rotation direction of the drive source.
Can be used selectively. Further, even when an electromagnet is used for the connection switching means as in this example, the connection by a cable or the like is sufficient only for the CSF of the first bin, and the work of attaching and detaching the CSF becomes easy. Furthermore, since each PUR is provided with a one-way clutch and does not use a conventional electromagnetic clutch, costs are reduced.

[Brief description of the drawings]

FIG. 1 is a side view showing an outline of the structure of a drive mechanism of a cut sheet feeder according to an embodiment of the present invention, FIG. 2 is a plan view showing details of a main part of FIG. 1, and FIG. 3 is an embodiment of the present invention. 4 (a), 4 (b) and 4 (c) are time charts showing driving control procedures for each bin CSF, and FIG. 5 is a conventional cut sheet feeder. a side view showing a structure outline of the driving mechanism, in FIG, 1 is a platen (drive source), 21 is a cut sheet feeder driving mechanism, 22 _1, 22 _2, 22 ₃ pickup roller, 23 is a gear (first of the drive member), 24 a gear (second driven member), 25 is connected switching means, 26 _1, 26 _2, 26 ₃ is one-way clutch, 100 _1, 100 _2, 100 ₃ are cut sheet feeder.

Claims (2)

(57) [Claims] 1. A first bin cut sheet feeder having a first pick-up roller (22 ₁₎ (100 _1), second bin cut sheet feeder having a second pick-up roller (22 ₂₎ (100 ₂ ) And the third pickup roller (2
3rd Bin Cut Sheet Feeder with 2 ₃ ) (100 ₃ )
When the first and the transmission member (23) for transmitting a rotational driving force from the driving source to the first pick-up roller (22 _1), the second, the drive in the third pick-up roller (22 _2, 22 ₃₎ A second transmission member for transmitting the rotational driving force from the source (24)
And transmitting the rotational driving force to the first transmission member (23) and the second transmission member (23).
Connection switching means for transmission selectively switching to either one of the transmission member (24) (25) and a said first to third pickup roller (22 _1, 22 _2, 22 ₃₎
, The respective pickup roller (22 _1, 22 _2, 22 ₃₎ Paper feeding one-way clutch to allow only the rotation in the direction of (26 _1, 26 _2, 26 ₃₎ are respectively provided, and the second The one-way clutch (26 ₂ , 26 ₃ ) provided on the third pickup roller (22 ₂ , 22 ₃ ) is configured such that one of the second and third pickup rollers (22 ₂ , 22 ₃ ) feeds out the paper. The cut sheet feeder is characterized in that the rotation transmitting direction is selected so that the other does not rotate when rotated in the direction. Wherein the first bin cut sheet feeder having a first pick-up roller (22 ₁₎ (100 _1), second bin cut sheet feeder having a second pick-up roller (22 ₂₎ (100 ₂ ) And the third pickup roller (2
3rd Bin Cut Sheet Feeder with 2 ₃ ) (100 ₃ )
In printers using cut sheet feeder structure including bets, driving source (1), a first transmission member for transmitting the rotational driving force from said first pick-up roller (22 ₁₎ to the driving source (1) (2
3); a second transmission member (24) for transmitting the rotational driving force from the driving source (1) to the second and third pickup rollers (22 ₂ , 22 ₃ ); A first transmission member (23) and the second transmission member (23);
Connection switching means for transmission selectively switching to either one of the transmission member (24) (25) and a said first to third pickup roller (22 _1, 22 _2, 22 ₃₎
, The respective pickup roller (22 _1, 22 _2, 22 ₃₎ Paper feeding one-way clutch to allow only the rotation in the direction of (26 _1, 26 _2, 26 ₃₎ are respectively provided, and the second The one-way clutch (26 ₂ , 26 ₃ ) provided on the third pickup roller (22 ₂ , 22 ₃ ) is configured such that one of the second and third pickup rollers (22 ₂ , 22 ₃ ) feeds out the paper. A printer having a configuration in which a rotation transmission direction is selected so that the other does not rotate when rotated in the direction.