diff --git a/app/src/main/java/org/ntlab/irisclient/viewmodels/TimerViewModel.java b/app/src/main/java/org/ntlab/irisclient/viewmodels/TimerViewModel.java
new file mode 100644
index 0000000..d7a59a4
--- /dev/null
+++ b/app/src/main/java/org/ntlab/irisclient/viewmodels/TimerViewModel.java
@@ -0,0 +1,47 @@
+package org.ntlab.irisclient.viewmodels;
+
+
+import android.util.Log;
+        import android.view.MotionEvent;
+
+        import androidx.lifecycle.LiveData;
+        import androidx.lifecycle.MutableLiveData;
+        import androidx.lifecycle.ViewModel;
+
+        import java.util.ArrayList;
+        import java.util.Collection;
+        import java.util.HashMap;
+        import java.util.Random;
+        import java.util.concurrent.ScheduledThreadPoolExecutor;
+        import java.util.concurrent.TimeUnit;
+
+
+//-----------------------------------------------------------------
+//
+public class TimerViewModel extends ViewModel implements Runnable {
+
+    private ScheduledThreadPoolExecutor thread = null;
+
+
+    //-----------------------------------------------------------------
+    // 一定間隔でサーバー上の筆跡を取得する（GET）
+    @Override
+    public void run() {
+
+        //この関数は数秒ごとに実行される
+    }
+
+    //-----------------------------------------------------------------
+    //何ミリ秒ごとにrun()を実行するかを決める
+    public void start(int interval) {
+        thread = new ScheduledThreadPoolExecutor(1);
+        thread.scheduleWithFixedDelay(this, interval, 1000L, TimeUnit.MILLISECONDS);
+    }
+
+    //-----------------------------------------------------------------
+    //
+    public void stop() {
+        thread.shutdown();
+    }
+    //-----------------------------------------------------------------
+}
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