Tactile Feels in Grasping/Cutting Processes with Scissors
Abstract
:1. Introduction
2. Materials and Methods
2.1. Scissors and Objects
2.2. Tactile Evaluation Tests
2.3. Mechanical Evaluation Tests
3. Results
3.1. Tactile Evaluation Tests
3.2. Mechanical Evaluation Tests
- One-step increase pattern: As shown in Figure 4a, when subjects grasped the soft urethane resin, a pattern in which Fxy increased slowly was observed in many cases. We defined this profile as a “one-step increase pattern.” From the moment when the blade touched the resin, the tangential force increased substantially with a constant slope. At 0.5 s, the force attained 3.8 N. At the start of the grasping process, θ was 18°. Then, as the force achieved maximum value, the θ decreased to 6°;
- Two-step increase pattern: As shown in Figure 4b, when a hard stainless plate was grasped by the forceps, a pattern in which Fxy increased through a two-step process was observed in many cases. The slope was mild in the second step, while it was steep in the first step. We defined this profile as a “two-step increase pattern”. After the resultant force increased to 1.9 N at 0.06 s, the force increased to 2.3 N at 0.5 s. At the start of the grasping process, θ was 17°; then, as the force achieved the maximum value, θ decreased to 16°;
- Double peak pattern: A characteristic profile was obtained when the adhesive tape was grasped (Figure 4c). We defined this profile as a “double peak pattern.” A peak, which was caused by the peeling of the tape from the blade, was observed during the handle opening. Fxy increased to 0.8 N at 0.65 s in the process of opening the handle and decreased to 0.1 N at the moment when the tape was peeled from the blade (at 0.75 s); and
- Drastic decrease pattern: When a subject cut the paper, the Fxy decreased sharply and then increased again to reach the maximum value (Figure 4d). We defined this profile as a “drastic decrease pattern.” On average, the cutting process began when the θ was 13°. The resultant force fluctuated (amplitude of 0.07 ± 0.05 N), increased to 0.7 N at 0.2 s, and then decreased to 0.3 N at the moment the cutting was completed (when θ was 1°). After that, the θ decreased to 0° and the force became 1.3 N at 0.3 s. During the cutting process, the Fxy fluctuated finely due to the friction among the scissor components and the paper.
3.3. Relationship Between the Tactile and Mechanical Evaluations
4. Discussion
5. Conclusions
Author Contributions
Funding
Conflicts of Interest
References
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Waga, M.; Aita, Y.; Noma, J.; Nonomura, Y. Tactile Feels in Grasping/Cutting Processes with Scissors. Technologies 2018, 6, 66. https://doi.org/10.3390/technologies6030066
Waga M, Aita Y, Noma J, Nonomura Y. Tactile Feels in Grasping/Cutting Processes with Scissors. Technologies. 2018; 6(3):66. https://doi.org/10.3390/technologies6030066
Chicago/Turabian StyleWaga, Mioto, Yuuki Aita, Junichi Noma, and Yoshimune Nonomura. 2018. "Tactile Feels in Grasping/Cutting Processes with Scissors" Technologies 6, no. 3: 66. https://doi.org/10.3390/technologies6030066