Patent Application
20240239621
The present invention relates to a feed roller mechanism and a printer.
JP2015-223704A discloses a printer provided with a liner sheet pulling roller that feeds a liner sheet of a label continuous body that is turned by a peeling plate rearward while nipping the liner sheet with an opposing roller.
In a mechanism that feeds a continuous paper using two rollers, such as the printer described above, it is required that the two rollers have an appropriate nipping force for nipping the continuous paper.
For example, when the nipping force between the two rollers becomes excessively high due to an assembly error or the like, it is considered that slippage between the two rollers and the continuous paper becomes difficult to occur, so that a large tension is applied to the continuous paper being fed and the continuous paper breaks. When the slippage between the two rollers and the continuous paper is difficult to occur, it is also considered that the continuous paper is likely to be distorted, and stress concentration may cause breakage of the continuous paper.
The present invention is made in view of such technical problems, and an object thereof is to make it possible to easily set the nipping force between the two rollers to an appropriate nipping force.
According to one aspect of the present invention, a feed roller mechanism that feeds a continuous paper while nipping the continuous paper between a first roller and a second roller that face each other, the feed roller mechanism comprising: a plate-shaped first support member that supports the first roller; and a plate-shaped second support member that supports the first support member, wherein the first roller nips the continuous paper with the second roller by a deflection reaction force of the first support member.
According to the above aspect, the nipping force between the first roller and the second roller is determined by the deflection reaction force of the first support member. Therefore, it is possible to suppress variation in the nipping force due to an assembly error or the like, and it is possible to easily set the nipping force between the first roller and the second roller to an appropriate nipping force.
Hereinafter, a printer 1 provided with a feed roller mechanism 70 according to an embodiment of the present invention will be described with reference to the accompanying drawings.
The printing unit cover 6 can be opened and closed around a printing unit cover opening and closing shaft 10 provided in a support case 9 of the central main body unit 2.
The control unit cover 7 can be opened and closed around a control unit cover opening and closing shaft (not shown) provided at one end portion of the central main body unit 2.
The power supply unit cover 8 can be opened and closed around a power unit cover opening and closing shaft 11 provided at the other end portion of the central main body unit 2.
A support link 12 is provided between the printing unit cover 6 and the support case 9 in a manner of bending as the printing unit cover 6 opens and closes. As a result, an open state of the printing unit cover 6 can be maintained. By providing a cover-side magnet 13 and a case-side magnet 14, a closed state of the printing unit cover 6 can also be maintained.
The central main body unit 2 is a rectangular plate-like unit having a predetermined mechanical strength. The central main body unit 2 is positioned at a central portion of the printer 1, and assembled with the printing unit 3, the drive unit (not shown), the control unit 4, and the power supply unit 5.
The central main body unit 2 is provided with a mounting portion 15 for mounting the printer 1 to a labeling machine (not shown).
The mounting portion 15 may have any configuration, and is provided at a peripheral portion of the central main body unit 2 in the example shown in
The printing unit 3 includes a printing section 16 that prints on a printing paper sheet (for example, a label or a label continuous body).
When the printing unit cover 6 is set to the open state, the printing section 16 of the printing unit 3 is exposed to the outside.
The printing unit 3 can print predetermined information on a label continuous body 17 in a feeding path 20 from an introduction port 18 to a discharge port 19 of the label continuous body 17 (printing paper sheet). As shown in an enlarged cross section in
As shown in
The printing section 16 includes a width regulating shaft 23, a pair of upper and lower auxiliary feed rollers 24, a position detection sensor 25, two guide rollers 26, a feed roller mechanism 70, a platen roller 28, a thermal head 29, and a peeling plate 30 in an order from an upstream side of the feeding path 20 (a rear side in
The printing section 16 includes a ribbon supply shaft 32 that supplies an unused thermal transfer ink ribbon 31 between the platen roller 28 and the thermal head 29, and a ribbon roll up shaft 33 that rolls up the used thermal transfer ink ribbon 31.
As shown in
Accordingly, a feeding posture of the label continuous body 17 is appropriately regulated along the feeding path 20.
The auxiliary feed roller 24 is driven in synchronization with the platen roller 28 and assists the platen roller 28 and the thermal head 29 in feeding the label continuous body 17 in forward and reverse directions. Forward feeding is downstream feeding, and reverse transport is upstream feeding.
The position detection sensor 25 can detect a relative positional relation between the label continuous body 17 and the platen roller 28 and the thermal head 29 by detecting the position detection mark of the liner sheet 21.
The feed roller mechanism 70 feeds the liner sheet 21 turned by the peeling plate 30 to the rear side of the printer 1 (left side in
The platen roller 28 nips the label continuous body 17 and the thermal transfer ink ribbon 31 with the thermal head 29 at a predetermined print pressure by a pressing spring 38. The printing unit 3 supplies print data to the thermal head 29 and rotates the platen roller 28 to print predetermined information on the label continuous body 17 (labels 22).
The thermal transfer ink ribbon 31 is supplied between the platen roller 28 and the thermal head 29 from the ribbon supply shaft 32 via a first ribbon guide roller 39, and is rolled up by the ribbon roll up shaft 33 via a second ribbon guide roller 40.
By pivoting an opening and closing lever 41 in a clockwise direction as shown in
When the opening and closing lever 41 is pivoted in a counterclockwise direction to engage a tip portion of the opening and closing lever 41 with a lever engagement pin 42 mounted on a frame 71, the platen roller 28 and the thermal head 29 are in a printing posture shown in
The peeling plate 30 turns only the liner sheet 21 of the label continuous body 17 at a tip portion thereof. Accordingly, the labels 22 are peeled off from the liner sheet 21 and discharged (issued) from the discharge port 19.
A power supply switch 43, an operation unit 44 including various operation keys, a display 45, and the like are provided above the support case 9 of the central main body unit 2 as shown in
As shown in
The non-volatile memory mounting structure 46 includes a USB connection port 48 on the front side of the support case 9 at an upper corner of a printing section space 47 formed between the printing unit cover 6 and the central main body unit 2. A USB memory 49 can be connected to the USB connection port 48.
The USB memory 49 can store print information. With the USB memory 49 connected to the USB connection port 48, the printer 1 can execute printing on the printing paper sheet by the printing section 16. The print information is, for example, print data supplied to the control unit 4. The USB memory 49 can store various software such as various commands, application software, and firmware.
The control unit 4 controls the drive unit, the printing unit 3, and the power supply unit 5. The control unit 4 exchanges the print information with the USB memory 49 connected to the USB connection port 48 as necessary.
As shown in
Next, the feed roller mechanism 70 will be described.
The second roller 82 is supported by the frame 71 of the printing unit 3 in a rotatable manner. The second roller 82 is driven by the drive unit via a drive gear (not shown) provided at an end portion on the central main body unit 2 side. That is, the second roller 82 is a drive roller and the first roller 81 is a driven roller. A roller surface of the second roller 82 is made of a rubber material.
The roller unit 80 is attached to the frame 71 of the printing unit 3 such that the first roller 81 is pressed against the second roller 82.
Specifically, the roller unit 80 is fixed to the frame 71 through a first step of fitting a hole 87e (see
The locking mechanism 90 is movable between a locking position where the two locking portions lock the pins 87f and 87i and an unlocked position where the two locking portions do not lock the pins 87f and 87i, and is always biased towards the locking position by a torsion spring 91.
In the third step, when the roller unit 80 is rotated around the pin 72 and the mounting screw 73 to press the pins 87f and 87i against the two locking portions of the locking mechanism 90, the locking mechanism 90 moves to the unlocked position against the biasing force of the torsion spring 91. Then, when the roller unit 80 rotates to a predetermined mounting position, the locking mechanism 90 returns to the locking position and the pins 87f and 87i are locked by the two locking portions. In this way, the roller unit 80 is fixed to the frame 71.
When the roller unit 80 is to be removed from the printer 1, first, a release lever 92 of the locking mechanism 90 is operated to set the locking mechanism 90 to the locked position, and the locking of the pins 87f and 87i by the two locking portions is released. Next, the mounting screw 73 is removed, and finally the roller unit 80 is pulled out from the pin 72.
When the roller unit 80 is attached to the frame 71, the first roller 81 is pressed against the roller surface of the second roller 82. As a result, a nipping force for nipping the liner sheet 21 between the first roller 81 and the second roller 82 is generated.
In a mechanism that feeds a continuous paper using two rollers such as the feed roller mechanism 70, it is required that the two rollers have an appropriate nipping force for nipping the continuous paper.
For example, when the nipping force between the two rollers becomes excessively high due to an assembly error or the like, it is considered that slippage between the two rollers and the continuous paper becomes difficult to occur, so that a large tension is applied to the continuous paper being fed and the continuous paper breaks. When the slippage between the two rollers and the continuous paper is difficult to occur, it is also considered that the continuous paper is likely to be distorted, and stress concentration may cause breakage of the continuous paper.
In this regard, in the feed roller mechanism 70 of the present embodiment, the roller unit 80 is configured so that the nipping force between the first roller 81 and the second roller 82 can be easily set to an appropriate nipping force. The roller unit 80 will be described in detail below.
The roller unit 80 can change between a first setting in which the nipping force is set to a predetermined first nipping force by changing an assembly state of component parts, and a second setting in which the nipping force is set to a predetermined second nipping force that is smaller than the predetermined first nipping force.
First, the roller unit 80 in the first setting will be described.
As shown in
The first support members 84 and 85 are plate-like members made of metal. As shown in
As shown in
The two holes 84c are positioned on the rear side of the first support member 84, and the hole 84e is positioned on the front side of the first support member 84.
Similarly, the first support member 85 includes a base portion 85a, a roller support portion 85b, two holes 85c, two notch portions 85d, and a hole 85e.
The second support member 86 is a flat plate-like member made of metal. The second support member 86 includes a protruding portion 86a provided at one end portion in the axial direction of the first roller 81 and protruding in the axial direction of the first roller 81; a protruding portion 86b provided at the other end portion in the axial direction of the first roller 81 and protruding in the axial direction of the first roller 81; four screw holes 86c into which the screws 88 are screwed; four notch portions 86d formed on the rear side edge, and three screw holes 86e into which the screws 89 are screwed.
The four screw holes 86c and the three screw holes 86e are aligned on a straight line L parallel to the axial direction of the first roller 81. Positions of the protruding portions 86a and 86b are offset from the straight line L toward the front side.
The mounting member 87 is a plate-like member made of metal. The mounting member 87 includes a base portion 87a; a mounting portion 87b formed at one end portion in the axial direction of the first roller 81 by bending in the direction perpendicular to the axial direction of the first roller 81; and a mounting portion 87c formed at the other end portion by bending in the direction perpendicular to the axial direction of the first roller 81.
The base portion 87a is provided with three holes 87d through which screws 89 are inserted. The mounting portion 87b is provided with a hole 87e into which the pin 72 attached to the frame 71 is fitted; a pin 87f locked to the locking portion of the locking mechanism 90; and a square hole 87g used for position adjustment of the first roller 81.
The mounting portion 87c is provided with a screw hole 87h into which the mounting screw 73 is screwed; a pin 87i locked to the locking portion of the locking mechanism 90; and a square hole 87j used for position adjustment of the first roller 81.
The first support members 84 and 85 are each fixed to the second support member 86 by the two screws 88 in a state where the hole 84e of the first support member 84 is retrofitted to one end portion of the first roller 81 via the bearing 83 and the hole 85e of the first support member 85 is retrofitted to the other end portion of the first roller 81 via the bearing 83.
When fastening the screws 88, by making the two notch portions 84d of the first support member 84 and the two notch portions 86d of the second support member 86 flush with each other using a jig or the like, assembly accuracy between the first support member 84 and the second support member 86 can be improved. The same applies to the first support member 85 as well.
The reason why the first support member 84 and the first support member 85 are provided as separate parts is to incorporate the first roller 81 into the roller unit 80 while achieving a configuration for restricting the movement of the first roller 81 in the axial direction by using the flanges of the bearing 83. That is, the bearing 83 is assembled to the roller unit 80 such that the flanges are positioned between the first support member 84 and the first support member 85.
However, various known structures can be adopted as the structure for restricting the movement of the first roller 81 in the axial direction. If the first roller 81 can be incorporated into the roller unit 80, the first support member 84 and the first support member 85 may be integrally formed.
The second support member 86 to which the first roller 81 and the like are attached is fixed to the mounting member 87 with three screws 89.
As shown in
As described above, the mounting portion 87b is provided with the square hole 87g, and the mounting portion 87c is provided with the square hole 87j. The square holes 87g and 87j have a square shape with a width in the front-rear direction larger than a diameter of the end portion of the first roller 81. Therefore, as shown in
Since the bearing 83 is retrofitted to the first roller 81, inner circumference and outer circumference of an inner ring 83a of the bearing 83 and inner circumference and outer circumference of an outer ring 83b of the bearing 83 are visually recognized as a quadruple circle coaxial with the first roller 81. Therefore, in the roller unit 80 of the present embodiment, when fastening the three screws 89, the position of the first roller 81 can be adjusted in the front-rear direction while confirming how the quadruple circle formed by the bearing 83 looks through the square holes 87g and 87j.
That is, the quadruple circle formed by the bearing 83 functions as an indicator (scale) when adjusting the position of the first roller 81.
As shown in
As described above, when the roller unit 80 is attached to the frame 71, the first roller 81 is pressed against the second roller 82. Therefore, when the roller unit 80 is attached to the frame 71, as indicated by a solid line arrow in
As a result, the nipping force between the first roller 81 and the second roller 82 is determined by the deflection reaction force of the first support members 84 and 85. Therefore, it is possible to suppress variation in the nipping force due to an assembly error or the like, and it is possible to easily set the nipping force between the first roller 81 and the second roller 82 to an appropriate nipping force.
Specifically, the smaller a spring constant of the first support members 84 and 85, the smaller the variation in the deflection reaction force of the first support members 84 and 85 due to an assembly error or the like. Therefore, by reducing the spring constant of the first support members 84 and 85 to such an extent that the variation in the deflection reaction force can be tolerated, the nipping force between the first roller 81 and the second roller 82 can be stably generated as intended.
Next, the roller unit 80 in the second setting will be described.
Specifically, in the second setting, the second support member 86 is assembled to the roller unit 80 so that the protruding portions 86a and 86b are positioned on the rear side.
In the roller unit 80 in the first setting, as shown in
Since the position of the first roller 81 does not change between the roller unit 80 in the first setting and the roller unit 80 in the second setting, there is no change in a load input point (position) to the free ends of the first support members 84 and 85 as cantilevers. On the other hand, in the roller unit 80 in the second setting, the fixed ends of the first support members 84 and 85 are positioned farther from the load input point than in the roller unit 80 in the first setting.
It means that the spring constant of the first support members 84 and 85 as leaf springs in the roller unit 80 in the second setting is smaller than the spring constant of the first support members 84 and 85 in the roller unit 80 in the first setting.
Therefore, in the feed roller mechanism 70 in the assembly state (second assembly state) in which the roller unit 80 is in the second setting, the nipping force between the first roller 81 and the second roller 82 can be set to a nipping force (predetermined second nipping force) smaller than the nipping force (predetermined first nipping force) of the feed roller mechanism 70 in the assembly state (first assembly state) in which the roller unit 80 is in the first setting. In the feed roller mechanism 70 in the second assembly state, similarly to the feed roller mechanism 70 in the first assembly state, the nipping force can be stably generated as intended.
The nipping force can also be changed by adjusting the position of the first roller 81. However, since a position adjustment range of the first roller 81 is limited by the holes 87d, the nipping force cannot be greatly changed. On the other hand, when the assembly state of the feed roller mechanism 70 is changed from the first assembly state to the second assembly state, the nipping force can be made smaller beyond the range of change in the nipping force due to position adjustment of the first roller 81.
As described above, the printer 1 of the present embodiment may print on the label continuous body 17 including the liner sheet 21 on which the perforations 17a are formed at a predetermined interval. When the liner sheet 21 is formed with the perforations 17a, it is more likely to break than when it is not formed with the perforations 17a. Therefore, by setting the feed roller mechanism 70 in the second assembly state to facilitate the occurrence of slippage between the first roller 81 and the second roller 82 and the liner sheet 21 to some extent, it is possible to suppress breakage due to a large tension applied to the liner sheet 21 being fed, and breakage due to stress concentration caused by distortion occurring in the liner sheet 21.
When the liner sheet 21 is not formed with the perforations 17a, by setting the feed roller mechanism 70 in the first assembly state and setting the nipping force between the first roller 81 and the second roller 82 to the predetermined first nipping force, more stable feeding can be achieved.
Whether the feed roller mechanism 70 is in the first assembly state or the second assembly state can be appropriately selected by the user according to the continuous paper to be fed. Therefore, when the continuous paper is formed with perforations, the feed roller mechanism 70 may be set in the first assembly state, and when the continuous paper is not formed with perforations, the feed roller mechanism 70 may be set in the second assembly state.
Main functions and effects of the feed roller mechanism 70 and the printer 1 configured as described above will be collectively described.
The feed roller mechanism 70 that feeds the liner sheet 21 while nipping the liner sheet 21 between the first roller 81 and the second roller 82 facing each other includes the plate-shaped first support members 84 and 85 that support the first roller 81; and the plate-shaped second support member 86 that supports the first support members 84 and 85. The first roller 81 and the second roller 82 nips the liner sheet 21 by the deflection reaction force of the first support members 84 and 85.
As a result, the nipping force between the first roller 81 and the second roller 82 is determined by the deflection reaction force of the first support members 84 and 85. Therefore, it is possible to suppress variation in the nipping force due to an assembly error or the like, and it is possible to easily set the nipping force between the first roller 81 and the second roller 82 to an appropriate nipping force.
The first support members 84 and 85 support the first roller 81 with the roller support portions 84b and 85b formed by bending in the direction perpendicular to the axial direction of the first roller 81.
Accordingly, the structure which supports the first roller 81 can be easily achieved by manufacturing the first support members 84 and 85 by press molding.
The feed roller mechanism 70 is capable of changing between the first assembly state in which the second support member 86 supports the roller support portions 84b and 85b of the first support members 84 and 85, and the second assembly state in which the second support member 86 does not support the roller support portions 84b and 85b of the first support members 84 and 85.
Accordingly, by setting the feed roller mechanism 70 to the second assembly state, the nipping force between the first roller 81 and the second roller 82 can be made smaller than when the feed roller mechanism 70 is set to the first assembly state. That is, the nipping force between the first roller 81 and the second roller 82 can be selected between the predetermined first nipping force and the predetermined second nipping force according to the continuous paper to be fed.
The second support member 86 includes the protruding portions 86a and 86b that are provided at the end portions in the axial direction of the first roller 81 and protrude in the axial direction of the first roller 81. In the first assembly state, the protruding portions 86a and 86b support the roller support portions 84b and 85b of the first support members 84 and 85, and in the second assembly state, the protruding portions 86a and 86b do not support the roller support portions 84b and 85b of the first support members 84 and 85.
Accordingly, it is possible to achieve a configuration of being capable of changing between the predetermined first nipping force and the predetermined second nipping force merely by providing the protruding portions 86a and 86b on the second support member 86. That is, it is possible to achieve a configuration of being capable of changing between the predetermined first nipping force and the predetermined second nipping force without increasing the number of component parts and cost.
The second support member 86 includes the plurality of screw holes 86c into which the screws 88 for fixing the first support members 84 and 85 to the second support member 86 are screwed, and the plurality of screw holes 86c are aligned on the straight line L, and the positions of the protruding portions 86a and 86b are offset with respect to the straight line L.
Accordingly, the first assembly state and the second assembly state can be changed by a simple operation of merely changing the inside and outside or front side and rear side of the second support member 86.
The first support members 84 and 85 are leaf springs.
Accordingly, strength and durability of the first support members 84 and 85 can be ensured.
The liner sheet 21 may include the perforations 17a formed at a predetermined interval.
Even when the liner sheet 21 includes the perforations 17a, by setting the feed roller mechanism 70 in the second assembly state to facilitate the occurrence of slippage between the first roller 81 and the second roller 82 and the liner sheet 21 to some extent, it is possible to suppress breakage due to a large tension applied to the liner sheet 21 being fed, and breakage due to stress concentration caused by distortion occurring in the liner sheet 21.
The printer 1 includes the feed roller mechanism 70.
Accordingly, in the printer 1, the nipping force between the two rollers that feed the continuous paper can be easily set to an appropriate nipping force.
While an embodiment of the invention has been described, the embodiment is merely one of application examples of the invention, and does not intend to limit a technical scope of the invention to a specific configuration according to the embodiment.
For example, in the above embodiment, the printer 1 including the feed roller mechanism 70 is described. However, the feed roller mechanism according to the present invention can be incorporated into various devices and facilities. Any configuration can be selected as appropriate for the configuration for attaching the feed roller mechanism to various devices and facilities.
In the above-described embodiment, the notch portion 86d of the second support member 86 is provided on one side edge (the side edge on the rear side in
In the above-described embodiment, the quadruple circle formed by the bearing 83 is used as an indicator when adjusting the position of the first roller 81. However, a component functioning as an indicator may be provided separately, or an indicator may be formed on an end surface of the first roller 81. The number of multiple circles as an indicator may be three or less, or may be five or more.
Further, in the above embodiment, the first support members 84 and 85, the second support member 86, and the mounting member 87 are made of metal. However, the first support members 84 and 85, the second support member 86, and the mounting member 87 may be made of materials other than metal, and may be made of synthetic resin, for example.
In the above embodiment, when the roller unit 80 is set to the first setting, the protruding portions 86a and 86b are positioned to support the roller support portions 84b and 85b of the first support members 84 and 85. However, the shape of the second support member 86 and the position at which the second support member 86 supports the first support members 84 and 85 are not limited to the above aspect. For example, the second support member 86 may not support the roller support portions 84b and 85b regardless of whether the roller unit 80 is set to the first setting or the second setting. That is, the second support member 86 can adopt various shapes that can change the spring constant of the first support members 84 and 85 as leaf springs by changing the assembly state.
In the above embodiment, the first support members 84 and 85 are each fixed to the second support member 86 by the two screws 88, and the second support member 86 is fixed to the mounting member 87 by the three screws 89. However, the number of the screws 88 and 89 can be changed as appropriate.
The present application makes a priority claim based on Japanese Patent Application No. 2021-91670 filed in the Japan Patent Office on May 31, 2021, and the entire disclosure of this application is incorporated herein by reference.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2021-091670 | May 2021 | JP | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/JP2022/021775 | 5/27/2022 | WO |
