Function to read file via ODBC

Hello, it must be a very simple problem, but I have already looked a lot and I could not find a solution to my question.

My configuration is:

    R version 3.3.1 (2016-06-21)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows >= 8 x64 (build 9200)

locale:
[1] LC_COLLATE=Portuguese_Brazil.1252  LC_CTYPE=Portuguese_Brazil.1252    LC_MONETARY=Portuguese_Brazil.1252 LC_NUMERIC=C                      
[5] LC_TIME=Portuguese_Brazil.1252    

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

loaded via a namespace (and not attached):
[1] tools_3.3.1  rpart_4.1-10

I made a function to import files via ODBC from an ACCESS database, as follows:

importa.sql <- function(arquivo)
  {
    library(RODBC) # carrega pacote para conectar ao ODBC
    con <- odbcConnect("CarteiraComercialLocal") # cria a conexão local
    qry<-paste("(","SELECT * FROM ",arquivo,")")
    arquivo <- sqlQuery(con,qry,stringsAsFactors=FALSE) # Importa o arquivo para o data.frame do R
  }

I tested each line of the function and the code works perfectly. The problem is that when I run the function, the file is not available in R, but it does not give any error !!!

Does anyone know what might be happening?