Wet leather stretching device

A wet leather stretching device, comprising:

• a stand part (5) provided with an up-and-down vibration block (6);
• first and second brackets (11, 12) respectively provided on left and right upper parts of the stand part (5);
• first and second lower rollers (13, 14) respectively disposed on the first and second brackets (11, 12);
• a head part (2) spaced apart from the up-and-down vibration block (6) by a predetermined distance;
• first and second upper rollers (21, 22) respectively provided on left and right sides of the head part (2);
• a first belt (17) moving in orbit between the first and second lower rollers (13, 14) while maintaining constant tension;
• a second belt (27) moving in orbit between the first and second upper rollers (21, 22) while maintaining constant tension and facing the first belt (17);
• a first pressing plate (18) provided with a plurality of pressure pins to tightly press against a lower surface of the first belt (17) in a state of being exposed through an upper surface of the up-and-down vibration block (6);
• and
• a second pressing plate (28) provided with a plurality of pressure pins to tightly press against an upper surface of the second belt (27) in a state of being exposed through a lower surface of the head part (2), wherein the second bracket (12) is provided with a mechanism for adjusting tension of the first belt (17), and the mechanism for adjusting the tension comprises:
• a movable plate (41) coupled to each of left and right side surfaces of the second bracket (12);
• a support plate (31) coupled to one surface of each movable plate (41);
• a cylinder (32) having a lower part fixedly coupled to one surface of a lower part of each support plate (31);
• a rod (33) protruding a certain length through an upper part of each cylinder (32);
• a guide end (35) provided on one surface of the movable plate (41) at a predetermined distance above each support plate (31);
• a guide plate (36) having a lower part connected to each rod (33), and having left and right side parts contacted with the guide end (35);
• and
• a movable pipe (37) with a predetermined length, while being in contact with the first belt (17) and having both end parts rotatably coupled to one guide plate (36) and the other guide plate (36) respectively.