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JP-2026075896-A - Media transport devices and electronic equipment

JP2026075896AJP 2026075896 AJP2026075896 AJP 2026075896AJP-2026075896-A

Abstract

[Problem] When the leading edge 16 of the medium 6, after the skew has been corrected, moves to the nip position Np of the second transport roller pair 15, there is a problem in that deformation returns to the state before correction. [Solution] The system comprises a second pair of transport rollers 15 positioned downstream of the first pair of transport rollers 14 in the transport direction F, a shutter unit 17 having a contact portion 18 against which the leading edge 16 of the transported medium 6 abuts upstream of the nip position Np of the second pair of transport rollers, and being displaceable between a first position that corrects the skew of the medium 6 and a second position that retracts the contact portion 18 so that the corrected medium 6 reaches the nip position, and a third pair of transport rollers 19 positioned between the first pair of transport rollers and the contact portion 18 in the first position. The third pair of transport rollers does not nip the medium before the leading edge of the medium abuts the contact portion when the shutter unit is in the first position, but nips and transports the medium after correction when the shutter unit is displaced from the first position to the second position. [Selection Diagram] Figure 4

Inventors

  • 松▲崎▼ 一俊

Assignees

  • セイコーエプソン株式会社

Dates

Publication Date
20260511
Application Date
20241023

Claims (11)

  1. A first pair of transport rollers that transport the medium in the transport direction, A second pair of conveying rollers is positioned downstream of the first pair of conveying rollers in the conveying direction and conveys the medium in the conveying direction, A shutter unit that is displaceable between a first posture in which the leading edge of the medium being transported by the first transport roller pair contacts a contact portion upstream of the nip position of the second transport roller pair in the transport direction, and in which the leading edge of the medium contacts the contact portion to correct the skew of the medium, and a second posture in which the contact portion is retracted from the medium so that the corrected medium reaches the nip position, The system comprises a third pair of conveying rollers positioned between the first pair of conveying rollers in the conveying direction and the contact portion in the first orientation, which conveys the medium in the conveying direction. The third pair of transport rollers is The shutter unit does not nip the medium before the leading edge of the medium comes into contact with the contact portion in the first position. After the correction, when the shutter unit is displaced from the first position to the second position, the medium is nipped and transported. A media transport device characterized by the following features.
  2. A media transport device according to claim 1, The third transport roller pair comprises a drive roller and a driven roller, The driven roller is, It is displaceable between a contact position in contact with the drive roller and a retracted position separated from the drive roller. The shutter unit is in the retracted position before the leading edge of the medium contacts the contact portion in the first position, and after correction, the shutter unit is displaced to the contact position while remaining in the first position. A media transport device characterized by the following features.
  3. A media transport device according to claim 1, The drive of the third transport roller pair is synchronized with the drive of the second transport roller pair. A media transport device characterized by the following features.
  4. A media transport device according to claim 2, It has an interlocking mechanism that links the displacement of the driven roller with the displacement of the shutter unit, The interlocking mechanism moves the shutter unit from the first position to the second position in conjunction with the displacement of the driven roller from the retracted position to the contact position. A media transport device characterized by the following features.
  5. A media transport device according to claim 4, The aforementioned interlocking mechanism is A phase difference cam connects the driven roller and the shutter unit in a way that enables power transmission, The system includes a displacement force applying unit that applies a displacement force to displace the driven roller, The aforementioned phase difference cam is After the correction, based on the displacement force, only the driven roller is displaced from the retracted position to the contact position. Next, the shutter unit is displaced from the first position to the second position based on the displacement force. A media transport device characterized by the following features.
  6. A media transport device according to claim 5, The aforementioned phase difference cam is A first cam base portion fixed to the shutter unit side, A second cam base portion is provided on the driven roller side and is rotatable in a state facing the first cam base portion, A long groove provided in the first cam base portion or the second cam base portion, The first cam base portion or the second cam base portion is provided on the side where the long groove is not provided, and comprises a projection that is movably engaged with the long groove, Furthermore, a rotatable rotating arm, one end of which is attached to the second cam base, The rotating arm is equipped with an elastic member attached to a portion of the rotating arm spaced apart from the second cam base portion, The driven roller is, The elastic member is held in place, The rotation arm rotates due to the displacement force, causing it to move between the retracted position and the contact position. A media transport device characterized by the following features.
  7. A media transport device according to claim 2, The driven rollers are displaced to the retracted position in the second posture after the second transport roller pair has nipped the medium. A media transport device characterized by the following features.
  8. A media transport device according to claim 2, The aforementioned drive roller is The axis and The system comprises a plurality of roller sections fixed to the aforementioned shaft, A media transport device characterized by the following features.
  9. A media transport device according to claim 2, The driven roller is a toothed roller. A media transport device characterized by the following features.
  10. A media transport device according to claim 1, A path arranged downstream in the transport direction of the second transport roller pair, comprising a reversal path through which the medium reverses direction and rejoins the transport path, A media transport device characterized by the following features.
  11. A media transport device according to any one of claims 1 to 10, An electronic device comprising a processing unit for processing the medium, which is located downstream in the conveying direction of the medium conveying device.

Description

This invention relates to electronic devices such as media transport devices and printers. An example of prior art for this type of device is the one described in Patent Document 1. Patent Document 1 discloses a recording medium transport device equipped with a plurality of shutters for correcting the skewness of the medium. Each shutter has a contact portion against which the leading edge of the medium being transported in the transport direction comes into contact. Each shutter is configured to be displaceable between a contact position in which the leading edge of the medium comes into contact with the contact portion and a retracted position in which the contact portion retracts to allow the medium to pass. The medium moves in the transport direction as the contact portion moves to the retracted position, the leading edge of the medium is nipped by the transport roller, and the medium is transported toward the recording unit located downstream in the transport direction. Japanese Patent Publication No. 2004-26343 A schematic diagram of the recording device of Embodiment 1, with some parts omitted.Enlarged cross-sectional view of the main part of the media transport device of Embodiment 1.Enlarged cross-sectional view of the main part of the media transport device of Embodiment 1.Enlarged cross-sectional view of the main part of the media transport device of Embodiment 1.A plan view of the shutter unit of Embodiment 1.An enlarged cross-sectional view of a key part showing a portion of the interlocking mechanism of Embodiment 1.An enlarged cross-sectional view of a key part showing another part of the interlocking mechanism of Embodiment 1.An enlarged cross-sectional view of the main part illustrating the operation of the interlocking mechanism of Embodiment 1.A perspective view of the drive roller of the third transport roller pair in Embodiment 1.A schematic perspective view illustrating one of the effects of Embodiment 1. The present invention will now be described in general terms. To solve the above problems, a media conveying device according to a first aspect of the present invention includes: a first conveying roller pair that conveys a medium in the conveying direction; a second conveying roller pair arranged downstream of the first conveying roller pair in the conveying direction and conveying the medium in the conveying direction; a first posture in which the leading edge of the medium conveyed by the first conveying roller pair contacts a contacted portion upstream of the nip position in the conveying direction of the second conveying roller pair, and the leading edge of the medium contacting the contacted portion corrects the skewness of the medium; and the media conveying the medium after correction so that it reaches the nip position. The device comprises a shutter unit that can be displaced to a second position in which the contact portion is retracted from the medium, and a third pair of transport rollers positioned between the first pair of transport rollers in the transport direction and the contact portion in the first position, and transporting the medium in the transport direction, wherein the third pair of transport rollers does not nip the medium before the leading edge of the medium contacts the contact portion when the shutter unit is in the first position, and nips and transports the medium after the correction and when the shutter unit is displaced from the first position to the second position. Here, in the phrase "after the correction and when the shutter unit is displaced from the first position to the second position, the medium is nipped and transported," the phrase "when the shutter unit is displaced from the first position to the second position, the medium is nipped" is used to mean that the third transport roller pair nipped the medium when the diagonal alignment of the medium has been corrected by the shutter unit in the first position, that is, before the shutter unit is displaced from the first position to the second position. According to this embodiment, the system includes a third pair of transport rollers positioned between the first pair of transport rollers and the contact portion in the transport direction, wherein the third pair of transport rollers is configured not to nip the medium before the leading edge of the medium contacts the contact portion when the shutter unit is in a first position, and to nip and transport the medium after correction when the shutter unit is displaced from the first position to the second position. As a result, after the diagonal correction, the third transport roller pair nip the medium in the corrected state. After the diagonal correction, the shutter unit is displaced from the first position to the second position, causing the leading edge of the medium to move toward the nip position of the second transport roller pair. During this movement, the medium is prevented from returning to its pre-correction state by the nip by th