JP2009119802A - Printer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a printer which can be used in a working place where an explosion protection is needed for safety, and enables a user to easily change a printing sheet of paper. <P>SOLUTION: In the present invention, a printing sheet storing case 3 is attached to a frame 2 of an inner pressure explosion protection structure, while a printing unit 5 is arranged in the frame 2, a first and second openings 2b and 2c are arranged on the printing sheet insertion and discharge sides of the frame 2, respectively, and a pair of sealing rollers 6d, 6d, 7d and 7d elastically held so as to close the openings 2b and 2c. The printing unit 5 can be thereby arranged in the frame 2 of the inner pressure explosion protection structure while a printing sheet 3a is arranged outside the frame of the explosion protection structure, and even the change of the printing sheet 3a is easily performed. Air is hardly leaked from the first and second openings 2b and 2c, and the air consumption is reduced thereby. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a printer that can be used in a work place that requires explosion-proof for safety and that can easily replace printing paper.

  2. Description of the Related Art Conventionally, in work places that handle flammable liquefied gas such as LPG and LNG, a printer that prints the type of liquefied gas, mixing ratio, measured value, etc. on printing paper such as slip paper is used. In this type of printer, since the control unit for instructing the printing contents to the printing unit is composed of an electronic circuit board, it is obliged to adopt an explosion-proof structure in order to avoid ignition from the electronic circuit board. . For this reason, not only the printing unit but also the printing paper is usually housed in the frame of the internal pressure explosion-proof structure. However, when replacing the printing paper, the frame body is released, so the internal pressure of the frame body is After rising, the printing operation must be stopped until scavenging for the specified time is completed. In order to avoid this, it is necessary to take out the printing paper out of the frame. However, in this type of printer, the printing unit has a marking body with marking characters and a slide shaft that presses the printing paper against the printing paper. A mechanical structure provided is widely used.

JP-A-9-174978

  In this printer, the engraved body can be placed outside the explosion-proof frame together with the printing paper, and the drive unit that controls the forward and backward movement of the slide shaft can be placed inside the explosion-proof frame, so it is easy to replace the printing paper while maintaining the explosion-proof function. it can. However, since the printing unit has a mechanical structure having a stamped body, the number of stamped characters is limited, and there are disadvantages such that an arbitrary character cannot be printed.

  The present invention has been created in view of the above-mentioned problems, while attaching a printing paper storage case to a frame having an internal pressure explosion-proof structure, while arranging a printing unit in the frame, the printing paper insertion side of the frame, Openings are provided on the printing paper discharge side, respectively, and a pair of seal rollers that are elastically held so as to close the openings are disposed.

  The frame body has a roller block that communicates with the opening and has a gap through which printing paper can pass, and the roller block includes a roller accommodation hole that communicates with the gap from above and below. Each of the seal rollers may be rotatably arranged.

  Further, one of the seal rollers on the printing paper discharge side may be configured to rotate by receiving rotation from a rotation drive source. The rotation driving source may be a paper roller driving motor that drives a paper roller for feeding printing paper, and the paper roller driving motor may rotate the sealing roller on the printing paper discharge side.

  In addition, a front door that can be freely opened and closed is provided on the printing paper discharge side of the frame body, and a seal roller is attached to the front door, and a main driving gear that rotates integrally with the paper roller is provided. The driven gear may be attached to the front door side, and the seal roller may be rotated by the rotation of the driven gear.

  In addition, one of the seal rollers on the printing paper insertion side rotates by receiving the rotation of the drive motor via the one-way clutch and feeds the printing paper to the paper roller. After that, the rotation stops and the sealing roller can rotate freely. You may comprise so that it may become.

  According to the printer of the present invention, since the printing unit can be arranged inside the frame of the internal pressure explosion-proof structure even though the printing paper is arranged outside the frame of the explosion-proof structure, the printing unit capable of printing arbitrary characters is used. In addition, the printing paper can be easily replaced. In addition, there is little air leakage from the opening of the frame, and the air consumption can be suppressed.

  Further, when the seal roller is attached to the roller block, air leakage from the opening is limited to the gap between the roller case and the seal roller, and the air consumption can be further suppressed.

  Furthermore, when the seal roller on the print paper discharge side rotates in response to the rotation of the rotation drive source, the print paper after printing can be reliably discharged. In this case, the rotation drive source can be a paper roller drive motor that feeds printing paper to the printing unit, and an inexpensive printer can be provided.

  In addition, when the seal roller on the print paper discharge side is attached to the front door, not only can the print paper be discharged reliably, but it can be used even if there is a paper jam or other problem on the print paper discharge side of the print unit. Can be solved easily. Further, when the front door is closed, the gears can be smoothly engaged and the printing operation can be resumed quickly.

  In addition, when the seal roller on the printing paper insertion side is driven by a drive motor, not only can the printing paper be surely sent to the paper roller, but also when the paper roller rotates, the sealing roller rotates freely as the printing paper moves. Therefore, the printing paper can be smoothly fed out.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 denotes a printer attached to a liquefied gas filling device (not shown) such as LPG, LNG, etc., and an internal pressure explosion-proof frame 2 having a front door 2a that can be opened and closed by key operation. And a non-explosion-proof printing paper storage case 3 attached to the printer. A printing unit 5 having a control unit 4 for instructing printing contents is arranged in the frame 2, and this control unit is composed of an electronic circuit board. The printing unit 5 has a heating element 5a corresponding to the printing paper 3a made of heat-sensitive paper. The heating unit 5a is heated according to the printing content from the control unit 4, and the heating surface is described later. It is configured to transfer to the paper 3a. Further, the printing unit 5 has a paper roller 5b and a paper roller driving motor (not shown) positioned on the printing paper supply side with respect to the heating element 5a. The paper roller 5b is rotated by the operation of the paper roller driving motor. The printing paper 3a is fed along the paper guide 5c, the positioning guide 5d, and the heating element 5a to second seal rollers 7d and 7d described later. In addition, the printing unit 5 is provided with a cutter 10 positioned on the printing paper discharge side from the heating element 5a and corresponding to the width of the printing paper 3a, so that a predetermined printing content is transferred to the printing paper 3a. When the fixed amount is discharged, the cutter 10 is configured to reciprocate up and down to cut the printing paper 3a.

  A printing paper supply unit 6 and a printing paper discharge unit 7 are arranged in the frame 2 in front of and behind the printing unit 5, and the printing paper supply unit 6 has a first opening 2 b provided in the frame 2. Further, the printing paper rejection unit 7 is configured to face the second opening 2c provided in the front door 2a. As shown in FIG. 2, the printing paper supply unit 6 has first roller blocks 6a and 6b at positions facing the first opening 2b, and the first roller blocks 6a and 6b include the first opening 2b. There are provided a gap through which the printing paper 3a can pass and first roller storage holes 6c, 6c communicating with the gap from above and below. A pair of first seal rollers 6d and 6d are arranged in the first roller storage holes 6c and 6c so as to contact each other, and the first seal rollers 6d and 6d are connected to the first roller blocks 6a and 6b. A side plate (not shown) to be fixed is rotatably held. Further, the lower side of the first seal roller 6d is configured to be slightly movable up and down, and both ends thereof are urged by a spring 6e from below through a bearing (not shown) and retracted downward. It is configured to be possible. Further, the gap between the first seal rollers 6d, 6d and the first roller blocks 6a, 6b is the upper surface side of the upper first seal roller 6d and the lower side of the lower first seal roller 6d and The first seal rollers 6d, 6d are configured so as to be slightly on the side surfaces thereof, and are configured to suppress air leakage from the first opening 2b.

  As shown in FIG. 3, the print paper discharge unit 7 has second roller blocks 7a and 7b at positions facing the second opening 2c, and these are fixed by side plates 7f and 7f so as to cover the side surfaces. . The second roller blocks 7a and 7b are provided with a gap that allows the printing paper 3a to pass through and communicates with the second opening 2c and second roller storage holes 7c and 7c that communicate with the gap from above and below. Yes. A pair of second seal rollers 7d and 7d are disposed in the second roller storage holes 7c and 7c so as to contact each other, and the upper side of the second seal rollers 7d and 7d can be slightly moved up and down. It is configured. Further, the second seal roller 7d on the upper side is urged by a spring 7e from above via a bearing 7g near both ends, and is configured to be retractable upward. Moreover, the gap between the second seal rollers 7d, 7d and the second roller blocks 7a, 7b is above the upper side of the upper second seal roller 7d, below the lower side second seal roller 7d, and both. The second seal rollers 7d and 7d are configured so as to be slightly on the side surfaces thereof, and are configured to suppress air leakage from the second opening 2c.

  The lower second seal roller 7d is configured to receive the rotation of the paper roller drive motor via the transmission mechanism 8, and reliably discharges the printing paper 3a cut by the cutter 10 from the second opening 2c. It is configured as follows. As shown in FIG. 4, the transmission mechanism 8 includes a main driving gear 5e that rotates integrally with the paper roller 5b, a first intermediate gear 8a that meshes with the first driving gear 5e and a pulley portion 8g, and a side plate 7f. And a second intermediate gear 8c rotatably held on the gear shaft 8b. The first intermediate gear 8a is rotatably attached to a rotating arm 8d that rotates about a gear shaft 8b, and the rotating arm 8d is always urged by a coil spring 8e, and the first intermediate gear 8a is rotated. 8a is configured to mesh with the main drive gear 5e. Further, as shown in FIG. 5, the rotating arm 8d is configured to move together with the front door 2a when the front door 2a is opened and to be detached from the main driving gear 5e. Further, the second intermediate gear 8c meshes with a driven gear 8f attached to one end of the second seal roller 7d so that the rotation of the paper roller drive motor is transmitted to the second seal roller 7d. It is configured. Moreover, the number of teeth of the second intermediate gear 8c is sufficiently larger than that of the driven gear 8f, and the second seal rollers 7d and 7d can be rotated at a higher speed than the paper roller 5b.

  On the other hand, the printing paper storage case 3 is provided with a pair of bearing bases 3b each having a U-shaped groove. A roll-like printing paper 3a is inserted into the hollow core from both ends of the bearing base 3b. It is placed via the roll shaft 3c. The roll shaft 3c has a shaft portion (not shown) and a pulley portion 3e, and the pulley portion 3e is guided by the bearing base 3b so that the printing paper 3a can be rotated.

  Further, a guide block 9 is attached to the printing paper storage case 3 so as to face the first opening 2b on the outer surface of the printing paper storage case 3, and the guide block 9 is attached to the printing paper 3a inserted into the printing paper supply unit 6. A guide roller 9a for guiding the upper surface and a guide plate 9b for guiding the end of the printing paper 3a to the first opening 2b are provided.

  Further, a tension roller 9c is disposed in the printing paper storage case 3 and is held by a bearing stand 3b to urge the upper surface of the printing paper 3a, and is configured to absorb an impact at the start of printing paper feeding. ing. In addition, the printing paper storage case 3 has an opening / closing lid 3d that can be opened on the upper side, and the printing paper 3a held on the roll shaft 3c can be easily exchanged by opening the opening / closing lid 3d. Yes.

  In the printer, when the printing paper 3a is supplied to the printing paper storage case 3, the shaft portion of the roll shaft 3c is inserted into the hollow core material of the printing paper 3a, and then the opening / closing lid 3d is opened to support the roll shaft 3c. Place on the table 3b. In this state, one end of the printing paper 3 a is inserted from the guide block 9 and pushed between the first seal rollers 6 d and 6 d of the printing paper supply unit 6. When the printing paper is further pushed in, one end thereof is guided by the paper guide 5c and the positioning guide 5d, and reaches the paper roller 5b of the printing unit 5. This is detected by a paper sensor (not shown), and the paper roller drive motor is driven. Accordingly, the printing paper 3a on the paper roller 5b is sent to a position between the second seal rollers 7d and 7d, and is cut at a predetermined position by the cutter 10, and the setting of the printing paper 3a is completed. Thereafter, the tension roller 9c is disposed on the upper surface of the printing paper 3a, and an appropriate tension is applied to the printing paper 3a to prepare for the printing operation of the printing unit 5.

  When the printing paper 3a runs out during printing and the printing paper 3a is replaced, the opening / closing lid 3d of the printing paper storage case 3 is opened, the roll shaft 3c holding the printing paper is taken out from the bearing base 3b, and again It is only necessary to set the printing paper 3a on the bearing stand 3b. Therefore, it is not necessary to open the inside of the frame 2 of the internal pressure explosion-proof structure, and not only can the printing work be started immediately, but also the printing unit is in the frame 2 so that various characters can be printed, Arbitrary characters can be printed.

  Further, since the first opening 2b and the second opening 2c are always closed by the paired first seal rollers 6d and 6d and the second seal rollers 7d and 7d, the amount of air consumed to increase the internal pressure of the frame 2 is reduced. Less is enough.

  Furthermore, even if a problem such as a paper jam occurs on the printing paper discharge side of the printing unit 5, if the front door 2a is opened, the main driving gear 5e and the first intermediate gear 8a are separated, and the trouble location is immediately found. can do. In addition, after the trouble is solved, the main drive gear 5e and the first intermediate gear 8a can be engaged with each other simply by closing the front door 2a, so that the time required for resuming the printing operation can be shortened.

In the present embodiment, the second seal rollers 7d and 7d are attached to the front door 2a. However, they may be provided at positions fixed away from the front door 2a. In this case, the rotation of the paper roller 5b can be directly transmitted to the second seal rollers 7d and 7d by a pulley mechanism (not shown). Further, the second seal rollers 7d and 7d can be directly rotated by a drive motor (not shown). Further, the first seal motors 6d, 6d can be rotated by a drive motor (not shown) to feed the printing paper 3a to the paper roller 5b. In this case, the first seal roller 6d that receives the rotation of the drive motor is configured to receive the rotation via a one-way clutch (not shown). With this configuration, when the first seal roller 6d receives a rotational force from the printing paper side, the first sealing roller 6d can rotate freely, and can be smoothly fed to a predetermined position even if the printing paper 3a is thin. Further, the printing unit 5 may be an inkjet type for plain paper.

FIG. 3 is an explanatory diagram illustrating an internal mechanism of the printer according to the invention. The expanded sectional view of the printing paper supply part which concerns on this invention. FIG. 3 is a partially cutaway enlarged cross-sectional view illustrating a printing paper discharge unit according to the present invention. The principal part expanded sectional view along the AA line of FIG. Explanatory drawing of the state which opened the front door concerning the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Printer 2 Frame 2a Front door 2b 1st opening 2c 2nd opening 3 Printing paper storage case 3a Printing paper 3b Bearing base 3c Roll shaft 3d Opening / closing lid 3e Pulley part 4 Control part 5 Printing unit 5a Heating element 5b Paper roller 5c Paper guide 5d Positioning guide 5e Main drive gear 6 Printing paper supply unit 6a, 6b First roller block 6c, 6c First roller storage hole 6d, 6d First seal roller 6e Spring 7 Printing paper discharge unit 7a, 7b Second roller block 7c, 7c Second roller storage holes 7d, 7d Second seal roller 7e Spring 7f, 7f Side plate
7g Bearing 8 Transmission mechanism 8a First intermediate gear 8b Gear shaft 8c Second intermediate gear 8d Rotating arm 8e Coil spring 8f Driven gear 8g Pulley portion 8h Pulley portion 9 Guide block 9a Guide roller 9b Guide plate 9c Tension roller 10 Cutter

Claims (6)

  A printing paper storage case is attached to the internal pressure explosion-proof frame, while a printing unit is arranged in the frame, and openings are provided on the printing paper insertion side and printing paper discharge side of the frame, respectively. A printer characterized in that a pair of sealing rollers that are elastically held are arranged.   The frame has a roller block that communicates with the opening and has a gap through which printing paper can pass, and the roller block has a roller accommodation hole that communicates with the gap from above and below, and each of these roller accommodation holes has a seal roller. The printer according to claim 1, wherein the printer is rotatably arranged.   3. The printer according to claim 1, wherein one of the seal rollers on the printing paper discharge side rotates in response to rotation from a rotation drive source.   4. The printing unit includes a paper roller drive motor that drives a paper roller for feeding printing paper, and is configured to rotate a seal roller on a printing paper discharge side by the paper roller drive motor. Printer.   A front door that can be opened and closed is provided on the print paper discharge side of the frame, and a seal roller is attached to the front door, while a main drive gear that rotates integrally with the paper roller that feeds the print paper is provided, and this main drive gear is elastically meshed. 5. The printer according to claim 4, wherein a biased driven gear is attached to the front door side, and the seal roller is rotated by the rotation of the driven gear. One of the seal rollers on the printing paper insertion side rotates by receiving the rotation of the drive motor via the one-way clutch, and feeds the printing paper to the paper roller. Thereafter, the rotation is stopped and the sealing roller can be rotated freely. The printer according to claim 1, 2, 3, 4 or 5.

Images