JPH04298366A - Sheet feeding device for printer - Google Patents

Abstract

PURPOSE:To prevent transmission of the rotation force of a platen gear to a sheet sucking roller for a cutform even when a line feed in an opposite direction is executed during the use of a continuous sheet by bringing a planetary gear into contact with a second gear mechanism. CONSTITUTION:First, when a continuous sheet is used, by moving a switching lever 2, which switches a cutform and the continuous sheet, in the direction of an arrow mark Y, an arm part 1 is rotated in the direction of an arrow mark W through a link mechanism 3. In which case, an end part 1A of the arm part 1 causes a planetary gear 61 of a planetary gear mechanism 90 to engage with an idle gear 60B through a support member 63. Thereby, since the planetary gear 61 of a planetary gear mechanism 90 is not brought into a state to separate from the idle gear 60B even when a platen gear 52 is rotated in the direction of an arrow mark B, the planetary gear is not engaged with an idle gear 55. Thus, no rotation force of the platen gear 52 is transmitted to a sheet sucking roller 53 for a cutform. Namely, even when a line feed in an opposite direction is carried out during the use of a continuous sheet, a cut sheet 64 is prevented from being sucked.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper feed device for printers, and more particularly to a paper feed device for printers that sucks up or ejects cut paper or continuous paper using the driving force of a platen. .

0002

2. Description of the Related Art Conventional examples of this type of printer paper feeding device are shown in FIGS. 4 and 5.

The conventional example shown in FIG. 4 includes a cylindrical platen 51 that is rotationally driven by a drive source (not shown), and a platen gear 52 that has the same axis on the axis of this platen 51 and rotates in synchronization with this platen 51. It is equipped with Further, by the rotation of the platen gear 52 in the direction of the arrow B as a temporary reverse rotation and the subsequent rotation in the direction of the arrow A as a forward rotation, the paper absorption rollers 53, 53 for cut paper In addition to transmitting the driving force, when the cut paper is absorbed to a predetermined position, the platen gear 52
The first gear mechanism 70 is provided to stop transmission of the driving force. This first gear mechanism 70 has two idle gears 54 and 55 as main parts. These idle gears 54, 55 are integrally mounted on the same shaft 56, and have missing portions 54A, 55A in a part of the gears on each outer circumference.
are formed respectively.

Idle gear 55 has a somewhat larger diameter than idle gear 54. The same shaft 56 that supports these idle gears 54 and 55 is configured to slide slightly when the idle gear 55 rotates in the opposite direction to the rotation of the idle gear 54. The missing portion 54A and the missing portion 55A of each gear are provided on opposite sides of the same axis 56. Further, the idle gear 55 connects the other idle gear 5 to the paper suction roller gear 57 which is fixed to the paper suction roller 53 so as to have the same axis.
6B so that they can be engaged with each other.

Further, in the conventional example shown in FIG. 4, the platen gear 52
It has a paper ejection roller gear 60 as a second gear mechanism 80 that transmits the driving force of the platen gear 52 to paper ejection rollers 58 and 59 that are pre-equipped for both cut paper and continuous paper only when rotating in the A direction of the platen gear. There is. This paper ejection roller gear 60
is fixed on the same axis as the paper ejection roller 59. Further, the paper ejection roller 58 is in pressure contact with the paper ejection roller 59 and rotates together with the paper ejection roller 59 to perform a paper ejection operation.

Furthermore, between the idle gears 54, 55 and the paper discharge roller gear 60, there is provided a planetary gear which has the function of selectively driving the first mechanism 70 or the second mechanism 80 by being biased by the platen gear 52. A mechanism 90 is provided. This planetary gear mechanism 90 has an idle gear 62 that engages with the platen gear 52, and a planetary gear 60 that engages with this idle gear 62 and rotates around a shaft 62A of the idle gear 62. The shaft 61A of this planetary gear 61 is
It is connected to the shaft 62A of the idle gear 62 by a support member 63. This planetary gear 61 is interposed between the idle gear 55 and the paper discharge roller gear 60. Furthermore, this planetary gear 61 is provided so as to rotate and engage between the idle gear 55 and the discharge roller gear 60 in accordance with the rotation of the platen gear 52 in the A or B direction.

[0007] Idle gear 54 is arranged so as to be engageable with idle gear 62. That is, in FIG. 5, the missing portion 54A of the idle gear 54 is located at the engagement site with the idle gear 62, so it is not engaged in this state. In order for these idle gears 62 and 54 to engage, first, when the planetary gear 61 is engaged with the idle gear 55 and slightly rotates the idle gear 55, the missing portion 54A rotates. Therefore, engagement is possible. From this, when the platen gear 52 is rotated in the direction of arrow B by the support member 63 and the idle gear 62, the planet gear 61 engages with the idle gear 55 and the platen gear 52
When the platen gear 52 rotates in the direction of arrow A, it engages with the discharge roller gear 60 and transmits the driving force of the platen gear 52.

Next, the overall operation of the above conventional example while using cut paper or continuous paper will be explained based on FIG.

First, when absorbing the cut paper 64, the platen gear 52 interlocking with the platen 51 is rotationally driven in the direction of arrow B by a drive source (not shown). This causes the idle gear 62 to rotate in the direction of arrow C. Then, the planetary gear 61 supported by the support member 63 rotates in the direction of arrow E about the shaft 62A of the idle gear 62 and engages with the idle gear 55. This engagement causes planetary gear 61 to rotate in the direction of arrow G, causing idle gear 55 and idle gear 54 to rotate in the direction of arrow J. Then, since the missing portion 54A of the idle gear 54 also rotates in the direction of the arrow J, the idle gear 54 and the idle gear 6
2 engages. When the platen gear 52 is rotated in the direction of arrow A while the idle gear 54 and the idle gear 62 are slightly engaged, the idle gear 62 is rotated in the direction of arrow D. Therefore, the idle gear 54 is rotated once in the direction of arrow J. At this time, the planetary gear 61 is rotated in the direction of arrow F by the support member 63 about the shaft 62A of the idle gear 62, and is engaged with the paper discharge roller gear 60. Since the idle gear 55 is coupled to the idle gear 54 on the same axis, it rotates in the direction of arrow J as the idle gear 54 rotates. Then, the missing portion 55A of the idle gear 55 also rotates in the direction of the arrow J, so that the idle gear 55 and the idle gear 56B engage with each other. Further, the idle gear 56B is rotated in the direction of arrow K until the idle gear 55 rotates once.

This idle gear 56B is engaged with the paper ejection roller gear 57, and thus rotates the paper ejection roller gear 57 in the direction of arrow L. Then, the paper absorbing roller 53, which is individually mounted on the shaft of the paper discharge roller gear, rotates in the direction of arrow M and absorbs the cut paper 64. When the absorbed cut paper 64 is absorbed to a predetermined position, the missing portion 54A formed on the circumference of the idle gear 54 rotates again to the engagement site with the idle gear 62. Moreover, a missing portion 55A formed on the circumference of the idle gear 55
The rotation of the idle gear 54 and the idle gear 55 is stopped because the idle gear 54 and the idle gear 55 rotate again to the engagement position with the idle gear 56B and release the engaged state. As a result, the rotation of the paper suction roller in the M direction is stopped.

Further, the cut paper that has been sucked up to a predetermined position is printed by the printing means 66 and is printed by the arrow A on the platen 51.
The sheet is conveyed to discharge rollers 59 and 58 by rotation in the direction and rotation of guide roller 67 . The planetary gear 61 supports the supporting member 6 as the idle gear 62 rotates in the direction of arrow D.
Since the rotation of the idle gear 52 in the direction of the arrow A is already engaged with the paper discharge roller gear 60 side by the rotation of the arrow 3, the rotation of the idle gear 52 in the direction of the arrow A is transmitted to the idle gear 62 in the direction of the arrow D, and is further transmitted to the planetary gear 61 in the direction of the arrow D. It is transmitted as rotation in the H direction.

[0012] Regarding the paper ejection roller gear 60,
This is transmitted as rotation in the direction of arrow P, and the discharge roller 59 rotates in the direction of arrow P. Further, since the paper ejection roller 58, which is mounted in pressure contact with the paper ejection roller 59, also rotates in the direction of arrow S, the cut paper 64 is ejected in the direction of arrow T. Thereafter, the same operation is repeated to absorb and discharge the cut paper.

Next, the use of continuous paper will be explained.

The continuous paper 65 is sucked through a paper suction port 75 exclusively for continuous paper, and is conveyed to the printing means 66 by rotation of the platen 51 in the direction of arrow A. Then, the continuous paper 65 is conveyed to the paper discharge rollers 59 and 58 by the rotation of the platen 51 in the direction of arrow A and the rotation of the guide roller 67. In this state, the planetary gear 61 is engaged with the paper discharge roller gear 60 due to the rotation of the platen gear 52 in the direction of arrow A. Therefore, as described above, the paper ejection roller 59 rotates in the direction of the arrow P, and the paper ejection roller 58 further rotates in the direction of the arrow S. Therefore, the continuous paper 65 was being discharged in the direction of arrow T.

[0015]

[Problems to be Solved by the Invention] The conventional paper feeding device for printers described above uses the forward and reverse rotation of the platen to suck up and eject cut paper. When performing a line feed (printing by rotating the platen in the opposite direction and feeding the continuous paper backwards to the absorbing side), there was an inconvenience that the cut paper would also absorb the paper.

[0016]

[Object] The purpose of the present invention is to improve the disadvantages of the conventional example, and in particular, to prevent the rotational force of the platen gear from being transmitted to the paper absorbing roller for cut paper even if a line feed is performed in the opposite direction while using continuous paper. The purpose is to provide a paper feeding device for a printer that does not need to be put away.

[0017]

[Means for Solving the Problems] The present invention has a platen gear that rotates in synchronization with the platen, and a temporary reverse rotation operation of the platen gear followed by forward rotation to cause a paper absorption roller for cut paper to absorb the platen gear. A first gear mechanism that transmits the driving force for paper and stops transmitting the driving force of the platen gear when the cut paper is sucked up to a predetermined position, and a first gear mechanism that transmits the driving force for paper and stops the transmission of the driving force of the platen gear when the cut paper is absorbed to a predetermined position, and a gear mechanism that transmits the driving force for the cut paper or A second gear mechanism is provided that transmits the driving force of the platen gear to the paper ejection roller that also serves as continuous paper. The printer is provided with a planetary gear mechanism between the second gear mechanism and the first gear mechanism, which has a function of selectively driving the first gear mechanism or the second gear mechanism by being biased by the platen gear. A paper feeding device is provided. A switching lever is provided to set the suction operation for cut paper or continuous paper, and a planetary gear mechanism operates in conjunction with this switching lever to always select the second gear mechanism while using continuous paper. The arm that regulates the movement is connected to the switching lever. Furthermore, this arm portion is rotatably provided on the shaft of the first gear mechanism, and is provided with a link mechanism that is interlocked with the operation of the switching lever. By doing this, we are trying to achieve the objectives mentioned above.

[0018]

[Operation] When using continuous paper, the arm part keeps the planetary gear in the planetary gear mechanism in contact with the second gear mechanism that transmits the driving force to the paper ejection roller, so the platen will not rotate in the opposite direction. However, the planetary gear never separates from this second gear mechanism.

[0019]

Embodiments Hereinafter, embodiments of the present invention will be explained based on FIGS. 1 to 3.

Here, the same reference numerals are used for the same components as in the conventional example described above. 1 and 2, the platen 51 includes a cylindrical platen 51 that is rotationally driven by a drive source (not shown), and a platen gear 52 that has the same axis on the axis of the platen 51 and rotates in synchronization with the platen 51. There is. Also, this platen gear 5
The paper suction driving force of the platen gear 52 is transmitted to the cut paper paper suction rollers 53, 53 by the temporary reverse rotation in the direction of arrow B and the subsequent forward rotation in the direction of arrow A. Additionally, a first gear mechanism 70 is provided that stops transmission of the driving force of the platen gear 52 when the cut paper is absorbed to a predetermined position. This first gear mechanism 70 has idle gears 54 and 55 as main parts, and these idle gears 54 and 55 are integrally installed on the same shaft 56, and a part of the gears on each outer circumference Missing portions 54A and 55A are formed in the respective portions.

Idle gear 55 has a somewhat larger diameter than idle gear 54. The same shaft 56 that supports these idle gears 54 and 55 is configured to slide slightly when the idle gear 55 rotates in the opposite direction to the rotation of the idle gear 54. The missing portion 54A and the missing portion 55A of each gear are provided on opposite sides of the same axis 56. Further, the idle gear 55 connects the idle gear 56B to the paper suction roller gear 57 which has the same axis and is fixed on the axis of the paper suction roller 53.
It is disposed so that it can be engaged through.

Further, only when the platen gear 52 rotates in the A direction, a second gear mechanism 80 that transmits the driving force of the platen gear 52 to the pre-equipped paper discharge rollers 58 and 59 which can also be used for cut paper or continuous paper is used. Paper roller gear 60 and an idle gear 60B that engages with this paper discharge roller gear 60
have. The paper ejection roller gear 60 is the paper ejection roller 59
are fixed on the same axis. Paper ejection roller 5
Reference numeral 8 rotates together with the paper ejection roller gear 58B and presses against the paper ejection roller 59 to perform a paper ejection operation. In this embodiment, the paper ejection roller gear 60 and the paper ejection roller gear 5
8B and are disposed in a mutually engaged state.

[0023]The above-mentioned idle gears 54, 55
and the idle gear 60B, a planetary gear mechanism 9 having a function of selectively driving the idle gears 54, 55 or the idle gear 60B by being biased by the platen gear 52.
0 provided. This planetary gear mechanism 90 has an idle gear 62 that engages with the platen gear 52, and a planetary gear 60 that engages with this idle gear 62 and rotates around a shaft 62A of the idle gear 62. A shaft 61A of the planetary gear 61 is connected to a shaft 62A of the idle gear 62 by a support member 63. This planetary gear 61 is interposed between the idle gear 55 and the idle gear 60B. Furthermore, this planetary gear 61 is provided so as to rotate and engage between the idle gear 55 and the idle gear 60B in accordance with the rotation of the platen gear 52 in the A or B direction.

Further, the idle gear 54 is arranged so as to be engageable with the idle gear 62. That is, in FIG. 2, the missing portion 54A of the idle gear 54 is located at the engagement site with the idle gear 62, so it is not engaged in this state. In order for these idle gears 62 and 54 to engage, first, the planetary gear 61 is connected to the idle gear 55.
When the idle gear 55 is slightly rotated by being engaged with the idle gear 55, the missing portion 54A rotates and can be engaged. Therefore, when the platen gear 52 is rotated in the direction of arrow B by the support member 63 and the idle gear 62, the planet gear 61 engages the idle gear 55 and starts transmitting the driving force of the platen gear 52. When rotates in the direction of arrow A, the idle gear 60
B to transmit the driving force of the platen gear 52.

As shown in FIG. 3, a switching lever 2 is provided for switching the suction operation for cut paper or continuous paper. Furthermore, this switching lever 2
The second mechanism 80 always operates in conjunction with the
An arm portion 1 is provided that restricts the operation of the planetary gear mechanism 90 so as to select the idle gear 60B. A rear portion 1B of this arm portion 1 is engaged with a switching lever 2 via a link mechanism 3. As shown in FIG. 2, this arm 1 is rotatably mounted on the same shaft 56 of the idle gears 55 and 54 described above. A distal end portion 1A of the arm portion 1 is arranged so as to be able to come into contact with a support member 63 that supports the planetary gear 61 described above. That is, in FIG. 3, the arm 1 shows a state in which the planetary gear 61 is pressed against the idle gear 60B via the support member 63.

Next, the operation of the above embodiment will be explained based on FIG.

First, when using continuous paper, when the switching lever 2 that switches between cut paper and continuous paper is moved in the direction of arrow Y, the arm portion 1 is rotated in the direction of arrow W via the link mechanism 3. move. Then, the tip portion 1A of the arm portion 1 contacts and engages the planetary gear 61 with the idle gear 60B via the support member 63. Therefore, the planetary gear 61 in the planetary gear mechanism 90 is connected to the platen gear 5.
Even if 2 rotates in the direction of arrow B, it does not separate from the idle gear 60B and is not engaged with the idle gear 55. Therefore, the platen gear 52 is connected to the paper absorbing roller 53 for cut paper.
rotational force is not transmitted. That is, even if a line feed is performed in the opposite direction while continuous paper is being used, the cut paper 64 will not be absorbed. On the other hand, when using cut paper,
When the switching lever 2 is moved in the direction of arrow Z, the arm portion 1 is rotated in the direction of arrow V via the link mechanism 3. Then, as shown in FIG. 2, the tip portion 1A of the arm portion 1 separates from the support member 63. For this reason, the planetary gear 61 has the same function and operation as the conventional example described above, and therefore can absorb and discharge cut sheets as necessary. Further, in this embodiment, the driving force of the platen gear 52 is transmitted between the paper ejection roller gear 60 and the planetary gear 61 via the idle gear 60B. Therefore, rotation of the platen gear 52 in the direction of arrow A is transmitted as rotation of the discharge roller gear 60 in the direction of arrow Q. Therefore, the paper ejection roller gear 58 that engages with this
B rotates in the direction of arrow S and discharges the continuous paper 65 in the direction of arrow T. Other operations are the same as in the conventional example.

[0028]

[Effects of the Invention] According to the present invention, which is configured and functions as described above, the arm part always brings the planetary gear in the planetary gear mechanism into contact with the second gear mechanism while continuous paper is in use. It is regulated. Therefore, even when the platen rotates in reverse due to line feed in the opposite direction, the planetary gear mechanism does not engage with the first gear mechanism, so the rotational force of the platen gear is not transmitted to the paper suction roller for cut paper. therefore,
Even if a line feed is performed in the opposite direction while using continuous paper, cut paper will not be absorbed. Additionally, since this arm operates in conjunction with the switching lever that switches between cut paper and continuous paper, it is possible to quickly bring the planetary gear into contact with the second gear mechanism and regulate it, which is unprecedented. An excellent printer paper feeding device can be provided.

[Brief explanation of drawings]

FIG. 1 is a perspective view of this embodiment.

FIG. 2 is an explanatory diagram showing the arrangement of arm portions in this embodiment.

FIG. 3 is an explanatory diagram showing the operation in this embodiment.

FIG. 4 is a perspective view of a conventional example.

FIG. 5 is an explanatory diagram showing the operation of a conventional example.

[Explanation of symbols]

1 Arm part 3 Link mechanism 2. Switching lever 52 Platen gear 70 First gear mechanism 80 Second gear mechanism 90 Planetary gear mechanism

Claims (3)

[Claims] 1. A platen gear that rotates in synchronization with the platen, and a temporary reverse rotation and subsequent forward rotation of the platen gear to transmit the paper absorption driving force of the platen gear to a paper absorption roller for cut paper and to cut the paper. a first gear mechanism that stops transmitting the driving force of the platen gear when the paper has been sucked up to a predetermined position; and an ejector for both cut paper and continuous paper that is pre-equipped only when the platen gear rotates in the forward direction. A second gear mechanism that transmits the driving force of the platen gear to the paper roller is provided, and between the second gear mechanism and the first gear mechanism, the first gear mechanism or In a paper feeding device for a printer equipped with a planetary gear mechanism having a function of selectively driving a second gear mechanism, a switching lever is provided for switching the suction operation for the cut paper or continuous paper, and
An arm portion that operates in conjunction with the switching lever and restricts the operation of the planetary gear mechanism so that the second gear mechanism is always selected during continuous paper use is engaged with the switching lever. Paper feeding device for printers. 2. A paper feeding device for a printer, wherein the arm portion is rotatably provided on a shaft in the first gear mechanism. 3. A paper feed device for a printer, wherein the arm portion includes a link mechanism that is interlocked with the operation of the switching lever.