US 11,986,987 B2
Injection molding machine
Hiroyuki Onuma, Numazu (JP)
Assigned to Shibaura Machine Co., Ltd., Chiyoda-ku (JP)
Appl. No. 17/437,241
Filed by Shibaura Machine Co., Ltd., Chiyoda-ku (JP)
PCT Filed Mar. 6, 2020, PCT No. PCT/JP2020/009823
§ 371(c)(1), (2) Date Sep. 8, 2021,
PCT Pub. No. WO2020/184471, PCT Pub. Date Sep. 17, 2020.
Claims priority of application No. 2019-044940 (JP), filed on Mar. 12, 2019.
Prior Publication US 2022/0168939 A1, Jun. 2, 2022
Int. Cl. B29C 45/76 (2006.01); B29C 45/04 (2006.01); B29C 45/84 (2006.01); B29C 45/17 (2006.01)
CPC B29C 45/768 (2013.01) [B29C 45/0441 (2013.01); B29C 45/84 (2013.01); B29C 2045/1784 (2013.01); B29C 2945/76163 (2013.01); B29C 2945/76254 (2013.01)] 4 Claims
OG exemplary drawing
 
1. An injection molding machine comprising:
a timing belt wound around a driving-side rotation member and a driven-side rotation member and configured to transmit power from the driving-side rotation member to the driven-side rotation member;
a driving-side rotation detector configured to detect a rotational speed of the driving-side rotation member;
a driven-side rotation detector configured to detect a rotational speed of the driven-side rotation member; and
a hardware processor configured to detect an abnormality in the timing belt based on a relative speed difference between the rotational speed of the driving-side rotation member detected by the driving-side rotation detector and the rotational speed of the driven-side rotation member detected by the driven-side rotation detector in a predetermined period from when the driving-side rotation member starts to rotate from a stopped state, wherein
the hardware processor is configured not to continuously monitor whether the abnormality occurs, and is configured to monitor whether the abnormality occurs only during the predetermined period.