JPH06100201A - Sheet transport device - Google Patents

Abstract

(57) [Summary] [Purpose] The detection terminal of the jam sensor is elastically positioned on the sheet conveyance path, the jam monitoring time is counted according to the detection output of the jam sensor, and the detection output of the jam sensor continues until this count is completed. In the sheet conveying device that determines the occurrence of the jam, the sensitivity difference of the jam detection due to a product error or a change with time is compensated. [Constitution] Time changing means 47, 48, 53 for variably setting the jam monitoring time are provided, and when the elastic force of the detection terminal of the jam sensor is insufficient, the jam monitoring time is extended to detect the jam sensor detection terminal. If the resilience of is excessive, shorten the jam monitoring time.

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 in printers, cutters and the like.

[0002]

2. Description of the Related Art In printers and cutters that perform printing and cutting on a sheet body, a structure is provided in which a sheet conveying device for carrying in a sheet body such as printing paper or film is provided in a functional portion such as a printing portion and a cutting portion. Has become. Such a sheet conveying apparatus is provided with sheet guides facing each other to form a sheet conveying path communicating with a functional portion, and a sheet conveying mechanism for sequentially conveying a sheet body by rollers or endless belts located on the sheet conveying path. The structure has been formed.

However, since a jam may occur in a sheet member mechanically conveyed by such a sheet conveying device, it is necessary to detect the jam and execute driving stop or notification of each part. For example, in a large sheet conveying device used in a copying machine or the like, there is one that detects an increase in load on the sheet conveying mechanism or a non-arrival of a sheet body at a predetermined position to detect a jam. Such a complicated detection mechanism hinders downsizing and weight reduction of equipment and productivity.

Therefore, as a prior art of the sheet conveying apparatus which has solved the above-mentioned problems, the 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, the sheet conveying apparatus 1 which is the sheet conveying apparatus exemplified here is formed as a part of the receipt printer 2 as illustrated in FIGS. 7 and 8. For example, such a receipt printer 2 has a journal. It is built in an electronic cash register (not shown) together with a printer (not shown).

First, in the receipt printer 2, as shown in FIG.
2, a pair of paper guides 4, 5 arranged at a position communicating with the paper insertion opening 3 are fixedly attached to the main frame 6 and formed by the paper guides 4, 5 facing each other. The paper transport path 7, which is the created sheet transport path, communicates with the printer unit 8. Here, in the printer unit 8, a thermal head 10 is attached to a bracket 9 which is pivotally supported by the main frame 6 so as to be openable and closable, and the thermal head 10 is a platen which is a sheet conveying mechanism positioned on the paper guide 5. It has a structure facing the roller 11 so that it can come into contact with and separate from the roller 11. Then, in the receipt printer 2, the sheet conveying path 13 which is a sheet conveying path communicating from the printer unit 8 to the auto cutter 12 is
It is formed by a pair of paper guides 14 and 15 facing each other.

Here, these paper guides 14, 15
The lower paper guide 14 is fixedly attached to the main frame 6, while the upper paper guide 15 is provided with a bearing portion 16 projecting upward from the rear portion thereof.
The rotating shaft 1 is attached to the bearing portion 17 formed on the bracket 9.
It is pivotally supported by being connected by 8.

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 portion of the bracket 9, and the jam sensor 19 has an elastically slidable detection terminal 20. Since the paper guide 15 is pressed and positioned from above, the paper guide 15 also functions as a detection terminal of the jam sensor 19. Further, in the receipt printer 2, the paper guide 15 faces the auto cutter 12 through a predetermined gap 22 set in advance corresponding to the amount of bending of the continuous paper 21 which is a jammed sheet. At the front edge of the paper guide 15 that faces the auto cutter 12, a bent portion 23 that extends upward is formed.

In the receipt printer 2 having such a structure, when the continuous paper 21 is inserted into the paper transport path 7 from the paper insertion port 3, the continuous paper 21 rotates the platen roller 11 as illustrated in FIG. According to the above, a predetermined image is printed when sequentially conveyed under the thermal head 10, and is conveyed from the sheet conveyance path 13 to the auto cutter 12 and cut into a predetermined length. In addition, this receipt printer 2
Then, normally, the paper guide 15 is positioned by the pressing force of the detection terminal 20 of the jam sensor 19, so that the paper conveyance path 13 reaching the auto cutter 12 is formed. Here, in the receipt printer 2, since the continuous paper 21 is cut by the auto cutter 12 as described above, the front edge portion of the cut continuous paper 21 collides with the insertion portion of the auto cutter 12 and the paper transport path. Jam may be generated within 13.

In the sheet conveying device 1 of the receipt printer 2, as shown in FIG. 9A, when the continuous paper 21 is jammed immediately before the automatic cutter 12, the continuous paper 21 is automatically cut by the automatic cutter 12. The gap 22 between the sheet guide 15 and the sheet guide 15 is curved. Then, the paper guide 15 is pressed upward by the continuous paper 21 that is curved by the jam, and as illustrated in FIG. It will rotate upwards against the elastic force of. In this case, since the detection terminal 20 that elastically positions the paper guide 15 is press-fitted into the jam sensor 19 to detect a jam, for example, a warning is given to the user by a buzzer, the printer unit 8 or the auto mode. The drive of the cutter 12 and the like is automatically stopped.

Incidentally, in the above-described sheet conveying device 1,
Since the jam sensor 19 may operate due to the bending of the continuous paper 21 even when the jam does not actually occur, such a temporary detection output of the jam sensor 19 is canceled. . That is, in the electronic cash register incorporating the receipt printer 2 as described above, the time counting means (not shown) such as a timer circuit (not shown) actually counts the jam monitoring time according to the detection output of the jam sensor 19. If the detection output of the jam sensor 19 continues until the count of the clocking means is completed, the information output means such as a CPU (Central Processing Unit) outputs jam information to a buzzer or a printer driver (both not shown). It is designed to output.

[0011]

In the above-described paper conveying apparatus 1, the occurrence of jam is detected by the presence or absence of displacement of the paper guide 15, and the paper guide 15 is detected by the detection terminal 20 of the jam sensor 19. Since it is elastically positioned at the normal position, its structure is extremely simple and can contribute to the reduction in size and weight of the device.

In other words, in the above-described sheet conveying device 1, the withstand pressure of the sheet guide 15 which is the detection sensitivity of the jam is defined by the elastic force of the slidable detection terminal 20 of the jam sensor 19, but this is the jam sensor. The product error of 19 affects the sensitivity of jam detection. Therefore, in the sheet transporting device 1 having the above-described structure, a support spring (not shown) for the detection terminal 20 of the jam sensor 19 is provided.
If the paper guide 15 is flexible, the paper guide 15 will not have sufficient withstand pressure, and malfunctions will frequently occur in jam detection. If the support spring of the detection terminal 20 of the jam sensor 19 is strong, the paper guide 15 will have no withstand pressure. Jam detection tends to be delayed due to excess.

[0013]

A sheet conveying mechanism for sequentially conveying sheet members located on a sheet conveying path is provided, and a jam sensor having detection terminals elastically positioned on the sheet conveying path is provided. A sheet provided with a time measuring means for counting a preset jam monitoring time according to the detection output of the above, and an information outputting means for outputting a jam information when the detection output of the jam sensor continues until the counting of the time measuring means is completed. The carrier device is provided with time changing means for variably setting the jam monitoring time counted by the time measuring means.

[0014]

[Function] When the elastic force of the detection terminal of the jam sensor is insufficient, the jam detection malfunction can be prevented by extending the jam monitoring time, and the elastic force of the detection terminal of the jam sensor is increased. In the case of excess, it is possible to prevent jam detection delay by shortening the jam monitoring time, so it is possible to very easily compensate for the difference in jam detection sensitivity due to product errors or changes over time. .

[0015]

Embodiments of the present invention will be described with reference to FIGS. The sheet transporting device 24, which is the sheet transporting device of this embodiment, is formed as a part of the journal printer 25 as illustrated in FIGS. 2 and 3, and the journal printer 25 is electronically coupled with the receipt printer 2. It is built in the cash register 26.

First, in this journal printer 25,
A pair of paper guides 4 and 5 arranged at a position communicating with the paper insertion opening 3 are fixedly attached to the main frame 6, and a sheet conveying path formed by these paper guides 4 and 5 facing each other is provided. A certain paper transport path 7 communicates with the printer unit 8. Here, in the printer unit 8, the thermal head 10 is attached to a bracket 27 that is rotatably supported by the main frame 6, and the thermal head 10 is located on the sheet guide 5 and is a platen roller 11 which is a sheet conveying mechanism. It has a structure that can be freely contacted and separated from. In the journal printer 25, the sheet conveying path 13 that is a sheet conveying path that communicates from the printer unit 8 to the writing table 28 is formed by a pair of sheet guides 14 and 15 facing each other.

Here, these paper guides 14 and 15
The paper guide 14 located below is the main frame 6
The paper guide 15 located above is fixedly mounted on the bearing guide 16. The bearing guide 16 projecting upward from the rear of the paper guide 15 is attached to the bearing 17 formed on the bracket 27.
Are connected to each other so that they are pivotally supported by a movable support mechanism including these members 16 to 18. Further, in the journal printer 25, the jam sensor 1 including a ready-made pressure switch or the like is provided at the front end portion of the bracket 27.
9 is attached, and the elastically slidable detection terminal 20 of the jam sensor 19 presses the paper guide 15 from above and positions it on the paper transport path 13.

Further, in the journal printer 25, the writing table 28 is rotatably supported by a support arm 29 and can be separated from the take-up reel 30, and the take-up reel 30 can be attached / detached or the journal paper can be used. 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 integrally formed support arm 29, and the support pin 31 at the lower end portion is rotatable. The side frame 35 is formed with a shaft hole 33 that axially supports the side frame 35 and an arcuate elongated hole 34 that slidably supports the support pin 32 in the central portion. The side frame 35 has a paper guide 36 elastically protruding from the upper edge of the rear part thereof. The paper guide 36 extends from the space between the paper guides 14 and 15 onto the writing table 28. 21
Is held from below.

Further, in the electronic cash register 26 of the present embodiment, as shown in FIG. 4 in appearance, the front left side of the upper surface of the main body housing 37 is the printer 2, 2.
Detachable printer cover 38 that shields 5 freely
A receipt issuing port 39 and a journal confirmation window 40 are formed on the printer cover 38.
In this electronic cash register 26, a drawer 41 is integrally formed at the bottom of the main body housing 37, and a keyboard 42, a mode key 43, a display 44 and the like are integrally provided on the upper surface thereof and a touch scanner 45. The handset 46 is held.

The electronic cash register 26
In terms of a circuit, as illustrated in FIG. 1, a CPU 47 that executes various types of information processing, a ROM (Read Only Memory) 48 in which various types of information are fixedly stored in advance, and various types of information are variably temporarily stored. RAM (Random Access Me
mory) 49, the printers 2, 25, the drawer 41,
The keyboard 42 for inputting various information, the mode key 43 for setting the operation mode to be switchable, the display 44 for displaying and outputting various information, the touch for reading and scanning various information from a bar code (not shown) A scanner 45, a buzzer 50 that outputs various information as voice, a telephone circuit 51 connected to the handset 46, a clock circuit 52 that measures the current time, a dip switch 53 that variably sets various conditions, It has a structure connected by a bus 54 for transmission.

The electronic cash register 26
In the same manner as in the conventional device, the CPU 47, the RAM 49, and the clock circuit 52 form a timer for counting the preset jam monitoring time according to the detection output of the jam sensor 19. If the detection output of the jam sensor 19 continues until the completion of counting, the CPU 47 forms an information output means for outputting jam information to the display 44, the buzzer 50, the printers 2, 25 and the like. Further, in the electronic cash register 26, the dip switch 53 is formed by n analog switches (not shown) that can be turned on and off manually.
The DIP switch 53, the CPU 47, and the RAM 49 form a time changing unit that variably sets the jam monitoring time counted by the time measuring unit as described above.

In the electronic cash register 26 having such a structure, when business information is input by the keyboard 42, the touch scanner 45, etc., the business information is edited by the central processing unit and displayed on the display 44.
Further, the edited business information is transferred to the receipt printer 2
Is printed on the continuous paper 21 by the printer, is issued as a receipt from the receipt issuing port 39, 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 the platen roller 1
The work information and the like are printed when sequentially conveyed under the thermal head 10 in accordance with the rotation of 1, and the receipt printer 2 is conveyed from the sheet conveyance path 7 to the auto cutter 12 and automatically cut, and the journal printer 25. It passes over the writing table 28 and is successively wound on the winding reel 30. In these printers 2 and 25, the paper guide 15 is normally positioned by the pressing force of the detection terminal 20 of the jam sensor 19, so that the paper conveyance path 13 reaching the auto cutter 12 and the writing table 28 is formed. There is.

Here, the electronic cash register 26
In the journal printer 25 of
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 38 as desired.

In the electronic cash register 26 of this embodiment, when the continuous paper 21 is set in the journal printer 25, the writing table 28 is separated from the take-up reel 30 by rotating the writing table 28 upward. At 28, the continuous paper 21 can be easily set on the take-up reel 30 without hindering the work. Moreover, in this journal printer 25, the writing table 28 is provided with the support arm 29 projecting downward.
Since it is pivotally supported at the lower end of the
Even if 8 is moved away from the vicinity of the take-up reel 30, it does not project upward, etc., and the occupied volume during its operation is reduced, and the operability is good.

Since the journal printer 25 has a structure in which the continuous paper 21 is conveyed without being cut and is wound by the take-up reel 30, the continuous paper 2 is generally used.
The possibility that a jam will occur in 1 is extremely low, but in reality, a jam may occur due to the continuous paper 21 being cut on the paper transport path 13. Then, in the paper transport device 24 of the journal printer 25 or the receipt printer 2,
When the continuous paper 21 is jammed on the paper transport path 13 as described above, the continuous paper 21 curved by the jam pushes the paper guide 15 upward, and when the pressing force exceeds the operating pressure, the paper guide 15 is The jam sensor 19 is rotated upward against the elastic force of the detection terminal 20.

In the paper transporting device 24, the clock circuit 52 starts counting the jam monitoring time read by the CPU 47 from the RAM 49 in accordance with the detection output of the jam sensor 19, as in the conventional paper transporting device 1. If the detection output of the jam sensor 19 continues until completion, the CPU 47 outputs jam information. Therefore,
In the electronic cash register 26, when the CPU 47 determines the occurrence of the jam and outputs the jam information as described above, the sound output of the buzzer 50 or the display output of the display 44 notifies the occurrence of the jam, and the printers 2, 25
The driving of etc. is automatically stopped.

Here, in the paper transporting device 24, as in the conventional paper transporting device 1, the operating pressure of the paper guide 15 which is the detection sensitivity of the jam is the elastic force of the slidable detection terminal 20 of the jam sensor 19. However, since there is a product error in the jam sensor 19 as described above, a difference occurs in the operating pressure of the paper guide 15. Therefore, in the sheet conveying device 24, the jam monitoring time counted according to the detection output of the jam sensor 19 is variably set by the dip switch 53, so that the difference in the jam detection sensitivity due to the product error of the jam sensor 19 is compensated. It has become. In the electronic cash register 26, the elastic force of the detection terminal 20 of the jam sensor 19 is measured at the time of product production, and the dip switch 53 is manually set.

Therefore, the processing operation in the case where the jam monitoring time is initialized from the setting state of the dip switch 53 as described above in the paper transporting apparatus 24 will be described in detail below with reference to the flowchart of FIG. . First,
If a predetermined numerical value is set in advance in the ON / OFF state of the n analog switches connected to the DIP switch 53 as described above, the set numerical value of the DIP switch 53 is read when the electronic cash register 26 is activated. Are initially set in the RAM 49. Then, in the electronic cash register 26, the ON / OFF states of the n analog switches connected to the DIP switch 53 are sequentially read, and the maximum number of the analog switches which are ON is set to the coefficient X, An error is output when all the analog switches are off. Then, when a predetermined numerical value is read from the DIP switch 53 as described above, this numerical value is set to the coefficient x of the arithmetic expression “cnt = x + 1” preset in the RAM 49, whereby the jam monitoring time is set. The initial setting of is completed.

Therefore, the processing operation when a jam occurs in the sheet conveying device 24 for which the jam monitoring time is initialized as described above will be described in detail below with reference to the flowchart of FIG. First, the paper guide 15 is pressed by the jammed continuous paper 21 on the paper transport path 13, and when the pressing force exceeds the operating pressure, the paper guide 15 and the detection terminal 20 are displaced, and the jam sensor 19 detects the jam. Will be output. Then, in the paper transport device 24, when the jam sensor 19 outputs the jam detection as described above, the CPU 47 subtracts "1" from "cnt" set in the RAM 49 and becomes "0". If the confirmation is confirmed, the jam information is immediately output, and if not confirmed, the clock circuit 52 counts the minimum unit time. Next, after the minimum unit time is counted, it is confirmed that the detection output of the jam sensor 19 continues. If this is not confirmed, the initial state is restored,
If it is confirmed, "1" is subtracted from "cnt" to confirm that it becomes "0". If this is confirmed, the jam information is immediately output, and if it is not confirmed, the count returns to the minimum unit time.

By doing so, in the paper transporting device 24, the product value of the numerical value set by the dip switch 53 and the minimum unit time becomes the jam monitoring time. Therefore, for example, the detection terminal 20 of the jam sensor 19 is detected. If the support springs are flexible and the operating pressure of the paper guide 15 is insufficient, the jam detection time can be set to three times the minimum unit time or the like to prevent jam detection malfunctions. When the support spring of the detection terminal 20 of 19 is strong and the operating pressure of the paper guide 15 becomes excessive, the jam detection time can be set to "0" to prevent the jam detection delay. That is, in the paper transporting device 24, even when the operating pressure of the detection terminal 20 is different due to the product error of the jam sensor 19, the detection monitoring time can be variably set by the dip switch 53 correspondingly. Therefore, it is possible to equivalently compensate for the jam detection sensitivity.

The journal printer 25 of this embodiment is used.
Then, when 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, the jammed continuous paper 21 is removed from the paper guide 14, and the platen roller is removed. The continuous paper 21 on 11 is pulled out and inserted into the writing table 28 from above the paper guide 14. In this state, the bracket 27 is closed and the paper guide 15 is pressed by the pressing force of the detection terminal 20 of the jam sensor 19.
Will be returned to the initial position.

Further, in the paper transport device 24 of this embodiment,
It was illustrated that the product error of the jam sensor 19 is compensated by measuring the elastic force of the detection terminal 20 of the jam sensor 19 at the time of production and setting a predetermined numerical value in the DIP switch 53. However, the present invention is not limited to the above, but can be applied to correction of a change with time of the jam sensor 19 of a product after shipping. Further, here, the detection monitoring time is set by the multiplication value of the numerical value set by the dip switch 53 and the minimum unit time, but the present invention is not limited to the above-mentioned form, and for example, a dip switch is used. It is also possible to select the detection monitoring time by dividing the maximum unit time by a fraction of the set value, or to select one of the preset multiple detection monitoring times by manual operation of the keyboard. Is.

Further, in the electronic cash register 26 of this embodiment, the paper transporting device 24 built in the printers 2 and 25 will be described as a sheet transporting device, and the CPU 47 and the clock circuit 52 which form a time measuring means, a time changing means and the like. The DIP switch 53 and the like are located outside the printers 2 and 25, which are a part of the sheet conveying device of the present invention.
Here, it is assumed that the circuit components are provided outside the main body of the apparatus and are connected.

[0035]

As described above, the present invention is provided with the sheet transport mechanism for sequentially transporting the sheet members located on the sheet transport path, and the jam sensor having the detection terminals elastically positioned on the sheet transport path. An information output means for outputting jam information when a detection output of the jam sensor is continued until counting of the jam monitoring time set in advance according to the detection output of the jam sensor is completed. In the sheet conveying apparatus provided with, by providing the time changing means for variably setting the jam monitoring time counted by the time measuring means, for example, when the elastic force of the detection terminal of the jam sensor is insufficient. Can prevent the malfunction of jam detection by extending the jam monitoring time, and the resilience of the detection terminal of the jam sensor is excessive. In such a case, the jam detection delay can be prevented by shortening the jam monitoring time, so that the sensitivity difference of the jam detection due to a product error or a change with time can be compensated very easily. It has an effect.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a vertical side view showing a journal printer.

FIG. 3 is a perspective view showing an R / J printer.

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

FIG. 5 is a flowchart showing a processing operation of initial setting of jam monitoring time.

FIG. 6 is a flowchart showing a jam detection processing operation.

FIG. 7 is a perspective view showing a prior art disclosed in Japanese Patent Application No. 3-145918 by the applicant.

FIG. 8 is a vertical sectional side view showing the receipt printer.

FIG. 9 is a vertical sectional side view showing a jam detecting operation.

[Explanation of symbols]

 7, 13 Sheet Conveying Path 11 Sheet Conveying Mechanism 15, 20 Detection Terminal 19 Jam Sensor 21 Sheet Body 24 Sheet Conveying Device 47 Information Output Means 47, 49, 52 Clocking Means 47, 49, 53 Time Changing Means

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kimio Nakamura 6-78 Minamimachi, Mishima City, Shizuoka Prefecture Tokyo Electric Co., Ltd. Mishima Plant (72) Inventor Katsune Hayashi 6-78 Minamimachi, Mishima City, Shizuoka Prefecture Tokyo Electric Co., Ltd. Company Mishima factory

Claims (1)

[Claims] 1. A sheet transport mechanism for sequentially transporting sheet members located on a sheet transport path, a jam sensor having detection terminals elastically positioned on the sheet transport path, and a jam sensor according to a detection output of the jam sensor. In a sheet conveying device provided with a time counting means for counting a preset jam monitoring time, and provided with an information output means for outputting jam information when the detection output of the jam sensor continues until the counting of the time counting means is completed, A sheet conveying apparatus comprising a time changing unit for variably setting a jam monitoring time counted by the time measuring unit.