JP2922725B2 - Sheet transport device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet conveying device used for a printer or a cutter.

[0002]

2. Description of the Related Art Some printers and cutters for performing various printing and cutting are provided with a sheet conveying device for carrying in a long sheet such as printing paper or film in a functional unit such as a printing unit or a cutting unit. . Such a sheet conveying device includes a sheet conveying path that communicates with a functional unit by providing opposing sheet guides, and includes a conveying mechanism that sequentially conveys a long sheet by a roller or an endless belt positioned on the sheet conveying path. It is a formed structure.

However, a jam may occur in a long sheet mechanically conveyed by such a sheet conveying apparatus. Therefore, it is necessary to detect the jam and stop driving or informing each unit. For example, in a large sheet conveying apparatus used in a copying machine or the like, there is a large sheet conveying apparatus that detects an increase in a load of a conveying mechanism or non-arrival of a long sheet to a predetermined position to detect occurrence of a jam. The complicated structure of the detection mechanism hinders downsizing and weight reduction of the equipment and productivity.

Therefore, as a prior art of a sheet conveying apparatus which has solved the above-mentioned problems, a sheet conveying apparatus disclosed in Japanese Patent Application No. 3-145918 by the present applicant is shown in FIGS.
It will be described based on. First, as illustrated in FIGS. 6 and 7, the sheet conveying device 1, which is a sheet conveying device illustrated here, is formed as a part of a receipt printer 2. It is built in an electronic cash register (not shown) together with a printer (not shown).

First, in this receipt printer 2, FIG.
As shown in FIG. 1, a pair of sheet guides 4 and 5 arranged at positions communicating with the sheet insertion slot 3 are fixedly attached to the main frame 6, and are formed by the opposed sheet guides 4 and 5. The paper transport path 7 which is the selected sheet transport path communicates with the printer unit 8 which is one of the functional units. Here, the printer unit 8 includes a platen roller as a transport mechanism in which a thermal head 10 is mounted on a bracket 9 pivotally supported on the main frame 6 so as to be openable and closable, and the thermal head 10 is located on the sheet guide 5. 11 so as to freely contact and separate. In the receipt printer 2, the printer unit 8
A paper transport path 13 which is a sheet transport path communicating with a rotary cutter 12 which is another functional unit is formed by a pair of sheet guides 14 and 15 facing each other.

Here, these sheet guides 14, 15
The lower seat guide 14 is fixedly attached to the main frame 6, but the upper seat guide 15 is formed on the bracket 9 by a bearing 16 projecting upward from the rear. Is connected to the bearing portion 17 by a rotating shaft 18, and is rotatably supported by a movable support mechanism including these members 16 to 18.

In the receipt printer 2, a jam sensor 19 composed of a ready-made pressure switch or the like is attached to the front end of the bracket 9, and the jam sensor 19 is resiliently slidable by a positioning mechanism. A certain detection terminal 20 presses and positions the sheet guide 15 from above. Furthermore, this receipt printer 2
Then, the continuous paper 2 which is a long sheet with a jam
The sheet guide 15 is opposed to the rotary cutter 12 via a predetermined gap 22 set corresponding to the amount of bending of 1. The front edge of the sheet guide 15 opposed to the rotary cutter 12 has Upward bending part 2
3 are formed.

In such a configuration, in the receipt printer 2, when the continuous paper 21 is inserted into the paper transport path 7 from the paper insertion port 3, the continuous paper 21 is rotated by the platen roller 11 as illustrated in FIG. When the paper is sequentially conveyed under the thermal head 10 according to the above, a predetermined image printing is performed, the paper is conveyed from the paper conveyance path 13 to the rotary cutter 12, and cut into a predetermined length. In the receipt printer 2, the sheet guide 15 is normally positioned by the pressing force of the detection terminal 20 of the jam sensor 19, so that the paper transport path 13 reaching the rotary cutter 12 is formed. Here, in the receipt printer 2, since the continuous paper 21 is cut by the rotary cutter 12 as described above,
The leading edge of the cut continuous paper 21 may collide with the insertion portion of the rotary cutter 12 and cause a jam in the paper conveyance path 13.

In the paper transport device 1 of the receipt printer 2, when a jam occurs in the continuous paper 21 immediately before the rotary cutter 12, as illustrated in FIG. And the sheet guide 15 is curved at the gap 22. Then
The sheet guide 15 is pressed upward by the continuous paper 21 curved by the jam, and as illustrated in FIG.
When the pressing force exceeds a predetermined value, the sheet guide 15 rotates upward against the elastic force of the detection terminal 20 of the jam sensor 19. In this case, the detection terminal 20 that has resiliently positioned the sheet guide 15 is replaced with the jam sensor 1.
Since the jam is detected by being pressed into the inside of the printer 9, for example, a warning to the user by a buzzer, an automatic stop of the printer unit 8, the rotary cutter 12, and the like are executed.

[0010]

In the above-described paper transport apparatus 1, the occurrence of a jam can be detected by the presence or absence of the displacement of the sheet guide 15, and the mechanism for positioning the sheet guide 15 at the normal position detects the jam. Jam sensor 1
9, the structure is extremely simple, which can contribute to reduction in size and weight of the device.

Here, in the case where the above-described receipt printer 2 performs jam processing, for example, the bracket 9 is opened upward and the jammed continuous paper 21 is fed to the sheet guide 1.
4, the continuous paper 21 on the platen roller 11 is pulled out, and the rotary cutter 12 is removed from the sheet guide 14.
The bracket 9 is closed in this state, and the sheet guide 1 is pressed by the pressing force of the detection terminal 20 of the jam sensor 19.
5 will be returned to the initial position. By doing so, in the receipt printer 2, it is possible to easily set the continuous paper 21 after the jam processing, and even if the newly set continuous paper 21 is pulled out from the rotary cutter 12 upward. Since the sheet guide 15 is not displaced, erroneous detection of the jam sensor 19 does not occur.

Here, the receipt printer 2 as described above is used.
An electronic cash register (not shown) having a built-in printer generally has a built-in journal printer (not shown).
A writing table and a take-up reel (both not shown) are sequentially provided at the position 2. Therefore,
When such a journal printer is provided with the sheet guide 15 and the jam sensor 19 as described above, the jam of the continuous paper 21 can also be detected satisfactorily.
In this case, erroneous detection is likely to occur in the jam sensor 19 when the continuous paper 21 is set after the jam processing.

That is, in the journal printer having a structure in which a writing table is provided at the position of the rotary cutter 12 of the receipt printer 2, the continuous paper 21 newly set after the jam processing is set on the writing table from between the sheet guides 14 and 15. Therefore, for example, when the continuous paper 21 on the writing table is pulled upward when the leading end of the continuous paper 21 is set on the take-up reel,
The sheet guide 15 is displaced upward, and erroneous detection of the jam sensor 19 occurs.

Since such a problem is common to the sheet conveying device in which the front of the movable sheet guide 15 is opened upward, for example, a receipt printer having a different form and position of a cutter mechanism (see FIG. (Not shown).

[0015]

To form a sheet conveying path in the sheet guide which faces SUMMARY OF THE INVENTION, provided the transport mechanism for transporting the long sheet located in the sheet conveying path sequentially less
The leading edge on the downstream side of one of the sheet guides undulates
So that the movable support mechanism for movably supporting provided, the sheet this support sheets guide movable support mechanism is provided a positioning mechanism for positioning the elastically to the sheet conveying path, which is positioned in the positioning mechanism A jam sensor for detecting a displacement of the guide is provided, and the jam sensor is adjacent to the downstream front edge of the sheet guide for detecting the displacement and the edge is brought close to the other sheet guide that is not displaced. A sheet stopper is provided.

[0016]

The sheet stopper located on the sheet conveyance path is adjacent to the front edge on the downstream side of the sheet guide, so that the long sheet inserted between the sheet guides passes through the sheet stopper when pulled out from under the sheet stopper. Even if the free end side of the long sheet is pulled upward, the displacement of the movable sheet guide is limited by the sheet stopper holding the long sheet, thereby preventing erroneous detection of the jam sensor.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. The sheet conveying device 24 as the sheet conveying device of the present embodiment is formed as a part of a journal printer 25 as illustrated in FIGS. It is incorporated in the cash register 26.

First, in this journal printer 25,
A pair of sheet guides 4, 5 arranged at positions communicating with the paper insertion slot 3 are fixedly attached to the main frame 6, and a sheet conveying path formed by the opposed sheet guides 4, 5 is provided. A certain paper transport path 7 communicates with a printer unit 8 which is one of the functional units. The printer unit 8 has a thermal head 10 mounted on a bracket 27 pivotally supported on the main frame 6 so as to be openable and closable. The thermal head 10 is mounted on a platen roller 11 which is a transport mechanism positioned on the sheet guide 5. It has a structure that can be freely approached and separated. In the journal printer 25, the paper transport path 13 which is a sheet transport path communicating from the printer unit 8 to the writing table 28 is provided.
It is formed by a pair of sheet guides 14 and 15 facing each other.

Here, these sheet guides 14, 15
The seat guide 14 located below is fixedly attached to the main frame 6, while the seat guide 15 located above is provided with a bearing 16 projecting upward from the rear thereof.
Is connected to a bearing portion 17 formed on the bracket 27 by a rotating shaft 18, and is rotatably supported by a movable support mechanism including these members 16 to 18. In this journal printer 25, a jam sensor 19 composed of a ready-made pressure switch or the like is attached to the front end of the bracket 27, and a detection terminal, which is a positioning mechanism that allows the jam sensor 19 to resiliently slide. 2
0 presses the sheet guide 15 from above and presses the sheet guide path 1
3 above.

Further, in the journal printer 25, the writing table 28 is rotatably supported by a support arm 29 so as to be detachable from the take-up reel 30. Is easy to set. More specifically, the writing table 28 has support pins 31 and 32 projecting from a lower end portion and a central portion of the support arm 29 integrally formed, and the support pin 31 at the lower end portion is rotatable. The side frame 35 is formed with a shaft hole 33 pivotally supported on the side frame 35 and an arc-shaped long hole 34 slidably supporting the center support pin 32. The side frame 35 has a seat guide 36 resiliently projecting from the upper edge of the rear portion.
The continuous paper 21 extending from the space 5 to the writing table 28 is held from below.

In the journal printer 25, a convex portion 37 formed on the front edge of the bracket 27 is provided.
The lower end of the sheet stopper 38 is located on the sheet transport path 13 adjacent to the front edge of the sheet guide 15. The sheet stopper 38 is formed of, for example, a molded product of a resilient plastic, and here, as illustrated in FIG. 3, a locking claw 39 that engages with the bracket 27 here.
And a slit 40 in which the convex portion 37 is fitted is formed at the upper part.

In the electronic cash register 26, as shown in FIG. 4, a detachable printer cover 42 for blocking the printers 2 and 25 so that the front left side of the upper surface of the main body housing 41 can come and go. The printer cover 42 has a receipt issuing port 43 and a journal confirmation window 44 formed therein. In this electronic cash register 26, a drawer 45 is integrally formed at the bottom of the main body housing 41, and a keyboard 46, a display 47 and the like are integrally provided on the upper surface thereof, and a touch scanner 48 and a handset 49 are provided. Is held.

In the electronic cash register 26 having such a configuration, when business information is inputted by the keyboard 46 or the touch scanner 48, the business information is displayed on the display 47 by being edited by the central processing unit, and the like.
Further, the edited business information is transmitted to the receipt printer 2.
Is printed on the continuous paper 21 and is issued as a receipt from the receipt issuing port 43, and the journal printer 25
Is printed on the continuous paper 21 and stored as a journal.

In the printers 2 and 25 of the electronic cash register 26, the continuous paper 21 is
When sequentially transported under the thermal head 10 according to the rotation of 1, the printing of business information and the like is performed, and the receipt printer 2 is transported from the paper transport path 7 to the rotary cutter 12 and automatically cut into a predetermined length. In the journal printer 25, the paper is passed over the writing table 28 and is sequentially taken up on a take-up reel 30. In these printers 2 and 25, the detection terminal 20 of the jam sensor 19 is normally used.
The sheet guide 15 is positioned by the pressing force of
A paper transport path 13 extending to the rotary cutter 12 and the writing table 28 is formed.

Here, the electronic cash register 26
In the journal printer 25 of FIG.
Since the continuous paper 21 is supported flat by the writing table 28 positioned below, the continuous paper 21 on the writing table 28 can be written by opening the printer cover 42 as desired.

In the electronic cash register 26 of this embodiment, when the continuous paper 21 is set on the journal printer 25, the writing table 28 is separated from the take-up reel 30 by rotating upward. At 28, the continuous paper 21 can be easily set on the take-up reel 30 without hindering the operation. In addition, in this journal printer 25, the writing table 28 has a support arm 29 projecting downward.
Writing table 2
Even when 8 is moved away from the vicinity of the take-up reel 30, it does not protrude upward, etc., and the occupied volume at the time of its operation is reduced, resulting in good operability.

The journal printer 25 has a structure in which the continuous paper 21 is conveyed without being cut and wound up by the take-up reel 30.
Although the possibility that a jam occurs in the sheet 1 is extremely low, the jam may occur in practice because the continuous paper 21 is cut on the paper transport path 13. In the paper transport device 24 of the journal printer 25, when the continuous paper 21 is jammed on the paper transport path 13 as described above, the sheet guide 15 is pressed upward by the continuous paper 21 curved by the jam, When the pressing force exceeds a predetermined value, the sheet guide 15 rotates upward against the elastic force of the detection terminal 20 of the jam sensor 19. In this case, the detection terminal 20 that has resiliently positioned the sheet guide 15 is pressed into the jam sensor 19 to detect a jam. Automatic drive stop and the like are executed.

In this manner, in the paper transport device 24, the occurrence of a jam can be detected by the presence or absence of displacement of the sheet guide 15, and the mechanism for positioning the sheet guide 15 at the normal position detects the jam. Since the jam sensor 19 has a very simple structure, it can contribute to reducing the size and weight of the device.

Note that the journal printer 25 of the present embodiment
In the case where a jam occurs in the continuous paper 21 on the paper transport path 13 as described above, for example, the bracket 27 is opened upward to remove the jammed continuous paper 21 to the sheet guide 14.
Then, the continuous paper 21 on the platen roller 11 is pulled out, and the writing table 2 is removed from the sheet guide 14.
8, the bracket 27 is closed in this state, and the sheet guide 15 is returned to the initial position by the pressing force of the detection terminal 20 of the jam sensor 19.

In the journal printer 25, the continuous paper 21 newly set after the jam is cleared is set on the writing table 28 from between the sheet guides 14 and 15, so that, for example, when the user is unfamiliar, When the leading end of the continuous paper 21 is set on the take-up reel 30, the continuous paper 21 on the writing table 28 may be pulled upward. In this case, in a conventional journal printer (not shown), the continuous paper 2 pulled upward
1, the erroneous detection of the jam sensor 19 occurs because the sheet guide 15 is displaced upward. However, as illustrated in FIG. 5, in the journal printer 25 of the present invention, the newly set continuous paper 21 is placed on the writing table 28. Even if the sheet stopper 38 is pulled out from the
Since the sheet guide 15 is not displaced upward by holding 1, the erroneous detection of the jam sensor 19 does not occur.

Note that the journal printer 25 of the present embodiment
In the above, the mounting of the separate sheet stopper 38 on the bracket 27 that rotatably supports the thermal head 10 is exemplified. However, the present invention is not limited to the above-described structure. May be integrally formed, or a sheet stopper may be fixedly provided on the sheet guide 14. In the present embodiment, the erroneous detection of the jam sensor 19 is
Paper transport device 24 to be prevented by
However, since the present invention is common to a sheet conveying apparatus in which a region in front of a movable sheet guide 15 is opened upward, for example, a receipt mechanism having a different form or position of a cutter mechanism is used. The present invention is also applicable to a printer (not shown).

[0032]

According to the present invention, as described above, a sheet transport path is formed by sheet guides facing each other, and a transport mechanism for sequentially transporting long sheets located on the sheet transport path is provided, and at least one of the sheet guides is provided. Downstream leading edge of
A movable support mechanism for movably supporting the portion so as to be undulated, a positioning mechanism for resiliently positioning a sheet guide supported by the movable support mechanism on the sheet conveying path, and being positioned by the positioning mechanism. A jam sensor for detecting the displacement of the sheet guide, and the jam sensor detects a displacement of the sheet guide downstream of the sheet guide for detecting the displacement .
By providing the sheet stopper with the edge close to the other sheet guide that is adjacent to the front edge and does not displace, the long sheet inserted between the sheet guides passes through the sheet stopper when pulled out from under the sheet stopper Even if the free end side of the long sheet is pulled upward, the sheet stopper holds the long sheet, which limits the displacement of the movable sheet guide and prevents erroneous detection of the jam sensor. It has an effect.

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing an R / J printer.

FIG. 3 is a perspective view showing a sheet stopper.

FIG. 4 is a perspective view showing an electronic cash register.

FIG. 5 is a vertical sectional side view showing an enlarged main part of the journal printer.

FIG. 6 is a perspective view showing a prior art disclosed by the present applicant in Japanese Patent Application No. 3-145918.

FIG. 7 is a vertical sectional side view showing the receipt printer.

FIG. 8 is a vertical sectional side view showing a jam detecting operation.

[Explanation of symbols]

 4, 5, 14, 15 Sheet guide 7, 13 Sheet transport path 16-18 Movable support mechanism 19 Jam sensor 20 Positioning mechanism 21 Long sheet 24 Sheet transport device 38 Sheet stopper

Continued on the front page (72) Inventor Kimio Nakamura 6-78, Minamicho, Mishima-shi, Shizuoka Prefecture Inside the Tokyo Electric Co., Ltd. Mishima Plant (72) Inventor Tomoaki Arakawa 6-78, Minamicho, Mishima-shi, Shizuoka Prefecture Inside the factory (72) Inventor Katsune Hayashi 6-78, Minamimachi, Mishima-shi, Shizuoka Prefecture Inside the Mishima factory of Tokyo Electric Co., Ltd. (56) References JP-A-4-116047 (JP, A) JP, U) (58) Field surveyed (Int.Cl. ⁶ , DB name) B65H 7/06

Claims (1)

(57) [Claims] 1. A sheet conveyance path is formed by sheet guides facing each other, and a conveyance mechanism for sequentially conveying long sheets located on the sheet conveyance path is provided, and at least one of the sheet guides has a downstream leading edge. A movable support mechanism for movably supporting the undulation is provided, and a positioning mechanism for resiliently positioning a sheet guide supported by the movable support mechanism on the sheet conveying path is provided, and the positioning mechanism is positioned by the positioning mechanism. A jam sensor for detecting the displacement of the sheet guide is provided, and the jam sensor is disposed adjacent to the front edge on the downstream side of the sheet guide for detecting the displacement and the edge is brought close to the other sheet guide that is not displaced, and the sheet stopper is moved. A sheet conveying device, comprising: