import threading
import time
from config import chatik, txt

@bot.message_handler(content_types=["new_chat_members"])
def handler_new_member(message):
    for user in message.new_chat_members:
            name = user
    if name.username is not None:
        bot.send_message(message.chat.id, 'Добро пожаловать, @{}'.format(name.username))
    else:
        bot.send_message(message.chat.id, 'Добро пожаловать, {}'.format(name.first_name))
def sending():
    bot.send_message(chatik, txt)
    threading.Timer(3600, sending).start()
sending()