Trouble with old sewing machine

[Toolmaker51]

Used to sew insulation materials. Toolmaking is an expansive category, but I recall little of use to you.
On the other hand, this appears to be a common homemaker machine. Those operate very much alike. A Google.com 'sewing machine problems' search pulled a zillion hits. Typical pages are ''5 common issues...'' etc. Unless it was dropped or won't cycle, sewing mechanisms are fixed by cleaning and careful lubrication, as things a homemaker could attend to. Can't speculate on Italy, but I'd think crafting is better rooted there, and shops to accomplish repairs exist. Vastly produced machines here were 'Singer' 'White' brands, and did a large portion of contract building as well, starting pre 1900. By interpreting the control labels, a similar unit and pdf manual should be easy to find.
Cool history note. Singer was commissioned by US Govt in 1925 to conduct feasibility studies theorizing production of 100 1911A1 .45 ACP pistols units per hour. In 1940 an educational production was awarded on 500 units. The 100 p/h was not achieved but the 'educational study' still advanced manufacturing practices and tooling was absorbed by Remington and Ithaca.
Those 500 units are among the most sought after today; enough so that many appearing are faked.