Patent ID: 8776980
Filing Date: 2014-07-15
Classification: G07D

Abstract:
1. A bill processing machine comprising: a pair of a first sensor unit and a second sensor unit that are arranged opposed to each other with a conveyance path of a bill therebetween; and a control portion that controls the pair of the first and second sensor units, the first sensor unit comprising: a first reflection sensor that includes a light source, a light receiving unit, an enclosure wall portion surrounding both the light source and the light receiving unit, and a partition wall positioned inside the enclosure wall portion and separating the light source from the light receiving unit; and a second reflection sensor that includes a light source, a light receiving unit, an enclosure wall portion surrounding both the light source and the light receiving unit, and a partition wall positioned inside the enclosure wall portion and separating the light source from the light receiving unit, the first and second reflection sensors of the first sensor unit being arranged in a line so that arrangement of the light source of the first reflection sensor with respect to the light receiving element of the first reflection sensor agrees with arrangement of the light source of the second reflection sensor with respect to the light receiving element of the second reflection sensor, the second sensor unit comprising: a first reflection sensor that includes a light source, a light receiving unit, an enclosure wall portion surrounding both the light source and the light receiving unit, and a partition wall positioned inside the enclosure wall portion and separating the light source from the light receiving unit; and a second reflection sensor that includes a light source, a light receiving unit, an enclosure wall portion surrounding both the light source and the light receiving unit, and a partition wall positioned inside the enclosure wall portion and separating the light source from the light receiving unit, the first and second reflection sensors of the second sensor unit being arranged in a line so that arrangement of the light source of the first reflection sensor with respect to the light receiving element of the first reflection sensor agrees with arrangement of the light source of the second reflection sensor with respect to the light receiving element of the second reflection sensor, the light sources of the first and second reflection sensors of the first sensor unit respectively opposing to the light receiving elements of the first and second reflection sensors of the second sensor unit with the conveyance path of the bill therebetween, and the light receiving elements of the first and second reflection sensors of the first sensor unit respectively opposing the light sources of the first and second reflection sensors of the second sensor unit with the conveyance path of the bill therebetween, wherein the control portion causes the first and second reflection sensors of the first sensor unit to sequentially detect first and second reflected lights reflected by a first face of a bill, respectively, the control portion causes the first and second reflection sensors of the second sensor unit to sequentially detect third and fourth reflected lights reflected by a second face of the bill, respectively, the control portion causes the first and second reflection sensors of the first sensor unit to sequentially detect first and second transmitted lights transmitted through the bill in a first direction in a front-to-back direction of the bill, respectively, and causes the first and second reflection sensors of the second sensor unit to sequentially detect third and fourth transmitted lights transmitted through the bill in a second direction in the front-to-back direction of the bill, respectively, and the control portion makes timing of detecting the first reflected light by the first reflection sensor of the first sensor unit agree with timing of detecting the fourth reflected light by the second reflection sensor of the second sensor unit.